WO2004095888A1 - 有機el素子及び有機elディスプレイ - Google Patents
有機el素子及び有機elディスプレイ Download PDFInfo
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- WO2004095888A1 WO2004095888A1 PCT/JP2004/004439 JP2004004439W WO2004095888A1 WO 2004095888 A1 WO2004095888 A1 WO 2004095888A1 JP 2004004439 W JP2004004439 W JP 2004004439W WO 2004095888 A1 WO2004095888 A1 WO 2004095888A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- C09B23/00—Methine or polymethine dyes, e.g. cyanine dyes
- C09B23/14—Styryl dyes
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- C09B57/00—Other synthetic dyes of known constitution
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- C09B69/00—Dyes not provided for by a single group of this subclass
- C09B69/10—Polymeric dyes; Reaction products of dyes with monomers or with macromolecular compounds
- C09B69/109—Polymeric dyes; Reaction products of dyes with monomers or with macromolecular compounds containing other specific dyes
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- H—ELECTRICITY
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
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- C—CHEMISTRY; METALLURGY
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/917—Electroluminescent
Definitions
- the present invention relates to an organic EL (electroluminescence, electroluminescence) element and an organic EL display.
- an organic EL device using a polymer material as a constituent material of the organic layer is being advanced.
- Such an organic EL device is generally a ⁇ -conjugated type using a ⁇ -conjugated polymer (see, for example, Japanese Patent Application Laid-Open No. 10-92576) and a non-conjugated polymer. (See, for example, Polymer, vol. 24, pp. 748 (1983) Applied Physics Letters, vol. 75, No. 1, pp. 4 (1999)).
- the non-conjugated organic EL device has an advantage that a desired color can be obtained with high color purity by mixing a predetermined dopant with a host polymer.
- the polymer material used in the conventional molecular-dispersion type organic EL device does not always have sufficient carrier transportability and stability, and therefore, the conventional molecule-dispersion type EL device has luminous efficiency and heat resistance. There is room for improvement in terms of performance and life.
- the present invention has been made in view of the above-mentioned problems of the related art. It is an object of the present invention to provide a molecularly dispersed organic EL element and an organic EL display capable of achieving all of heat resistance, lifetime, and luminous efficiency at a high level.
- the present inventors have conducted intensive studies to achieve the above object, and as a result, obtained a vinyl polymer by polymerizing a vinyl monomer having a specific structure, and using the polymer as a constituent material of an organic layer. As a result, they have found that the above-mentioned problems can be solved, and have completed the present invention.
- the organic EL device of the present invention comprises: a substrate; a first electrode layer formed on one side of the substrate; an organic layer formed on the first electrode layer; And a second electrode layer formed thereon, wherein the organic layer contains a vinyl polymer obtained by polymerizing a polymerizable monomer containing a compound represented by the following general formula (1) or (2). It is characterized by the following.
- L 1 and L 2 each represent a divalent group
- X 1 , X 2 , X 3 , X And X 5 and X 6 may be the same or different and each represents an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a heterocyclic group, an amino group, a halogen atom or a cyano group
- e represents 0 or 1
- b, f, g, and h each represent an integer of 0 to 3
- c represents an integer of 0 to 2
- d represents an integer of 0 to 4, and constitutes a fluoranthene ring
- the substituents bonded to the carbon atoms may be bonded to each other to form a ring.
- a vinyl polymer is obtained by polymerizing a polymerizable monomer containing the compound represented by the above general formula (1) or (2), and the vinyl polymer is converted to an organic compound.
- Inclusion in the layer enhances the transportability (especially the electron transportability) of holes and electrons injected from each of the first and second electrode layers into the organic layer, thereby sufficiently increasing the efficiency of light emission derived from the light emitting dopant. Can be improved.
- such a vinyl polymer has high heat resistance and excellent stability, so that a high level of luminous efficiency can be stably obtained over a long period of time.
- the organic layer may not contain a light emitting dopant other than the vinyl polymer, but an organic layer may be used to obtain a desired light emitting color.
- the layer may further contain another luminescent dopant.
- the bullet polymer is obtained by polymerizing a polymerizable monomer containing a compound represented by the following general formula (3).
- a vinyl polymer By using such a vinyl polymer, the heat resistance, lifetime, and luminous efficiency of the organic EL device can be further increased.
- L 1 represents a divalent group
- X 1 , X 2 and X 3 may be the same or different and each represents an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a heterocyclic group, an amino group.
- d represents an integer of 0 to 4, and the substituents bonded to the carbon atoms constituting the fluoranthene ring may be bonded to each other to form a ring.
- the butyl polymer is represented by the general formula (1) or (3), and L 1 is a substituted or unsubstituted phenylene group.
- the heat resistance of the organic EL device can be improved. Lifetime and luminous efficiency can be further increased.
- the vinyl polymer is one or more of the compounds represented by any of the general formulas (1) to (3), and One or more vinyl monomers with different structures And a copolymer of
- the organic layer can be formed.
- the degree of freedom in the molecular design of vinyl bolimer for imparting desired characteristics is increased, and fine adjustment of device characteristics is facilitated. Further, heat resistance and life can be further improved.
- the organic layer may have a single-layer structure composed of only the light-emitting layer, but the light-emitting layer and the light-emitting layer of the first or second electrode layer may be used. It is preferable that the layer has a layered structure including: a layer for injecting electrons into the layer; and an electron transport layer formed between the light emitting layer.
- the organic layer having such a configuration one or both of the light-emitting layer and the electron transport layer preferably contains the vinyl polymer according to the present invention, and both the light-emitting layer and the electron transport layer contain the biel polymer. Is particularly preferred
- the organic EL device of the present invention may further include a hole transport layer between the electrode layer for injecting holes into the light emitting layer and the light emitting layer.
- the organic layer may further contain a light-emitting dopant other than the bullet polymer according to the present invention, and it is particularly preferable that the organic layer further contains a blue light-emitting dopant.
- the organic EL display of the present invention comprises: a substrate; a first electrode layer formed on one side of the substrate; an organic layer formed on the first electrode layer; Multiple organic EL elements composed of the formed second electrode layer A display unit in which elements are arranged, a power supply unit electrically connected to the first and second electrodes and supplying a voltage or a current to the first and second electrodes, and an organic EL element, respectively. And a switching part for turning on or off the organic layer, wherein the organic layer contains a vinyl polymer obtained by polymerizing a polymerizable monomer containing the conjugated compound represented by the following general formula (1) or (2). It is characterized by doing.
- L 1 and L 2 each represent a divalent group
- X 1 , X 2 , X 3 , X 4 , X 5 and X 6 may be the same or different and each represents an alkyl group
- a and e each represent 0 or 1
- b, f, g, and h each represent 0 to 3.
- the organic EL element of the present invention is provided in the display section. By arranging the LEDs and driving the display unit by the power supply unit and switching unit, it is possible to realize an organic EL display with excellent brightness and color display function, high heat resistance and long life. .
- FIG. 1 is a schematic sectional view showing a preferred embodiment of the organic EL device of the present invention.
- FIG. 2 is a block diagram showing a preferred embodiment of the organic EL display of the present invention.
- the organic layer according to the present invention is obtained by polymerizing a polymerizable monomer containing a compound represented by the following general formula (1) or (2), preferably a compound represented by the following general formula (3).
- the resulting polymer (hereinafter, occasionally referred to as the “bull polymer of the present invention”) is included.
- a target compound can be obtained without affecting the butyl group by using a Suzuki reaction, a Grignard reaction, or the like.
- L 1 and L 2 each represent a divalent group.
- a divalent group examples include an alkylene group such as a methylene group, an ethylene group and a propylene group, and an arylene group such as a phenylene group. These divalent groups may have a substituent or may be unsubstituted.
- a and e each represent 0 or 1, and when a and e are 0, a structure is obtained in which a bull group is directly bonded to a carbon atom constituting a fluoranthene ring.
- L 1 and L 2 are each a substituted or unsubstituted phenylene group and a and d are each 1 (ie, a substituted or unsubstituted vinyl phenylene group) Is preferred.
- a substituted or unsubstituted vinyl phenylene group the carbon atom of the fluorene ring bonded to the phenylene group is On the other hand, it is preferable that the Bull group is bonded to the p-position.
- X 1 , X 2 , X 3 , X 4 , X 5 and X 6 each represent a substituent bonded to a constituent carbon of the fluoranthene ring, and each represents an alkyl group, an alkoxy group, Aryl group, aryloxy group, heterocyclic group, amino group
- b, c, d, f respectively g and h X 1, X 2, X 3, X 4, represents the number of X 5 and X 6, f, g ⁇ beauty h each 0-3 integer
- c is an integer of 0 to 2
- d is an integer of 0 to 4.
- alkyl group When the substituents represented by X ⁇ 6 is an alkyl group, ⁇ alkyl group may be filed in either linear or branched.
- the alkyl group is preferably unsubstituted, but may have a substituent.
- Alkyl The group preferably has 1 to 10 carbon atoms.
- Preferred alkyl groups include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isopropyl group, an s-butyl group, a t-butyl group, a pentyl group, and the like. .
- the alkyl group constituting the alkoxy group may be linear or branched.
- the alkoxy group is preferably unsubstituted, but may have a substituent.
- the alkoxy group preferably has 1 to 10 carbon atoms.
- Preferred alkoxy groups include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isoptoxy, s-butoxy, t-butoxy and the like.
- the aryl group may be substituted or unsubstituted, but the total carbon number of the aryl group is 6 to 20 is preferred.
- Preferred aryl groups include phenyl, o-tolyl, m-tolyl, and p-tolyl, biphenylyl and the like.
- the aryl group constituting the aryloxy group may be substituted or unsubstituted
- the total carbon number of the aryloxy group is preferably from 6 to 20.
- Preferred aryloxy groups include phenoxy, o-tolyloxy, 2 ⁇ -tolyloxy, and J) -tolyloxy.
- the heterocyclic group is preferably a 5- or 6-membered ring group.
- the heterocyclic group may have a condensed ring, and may have a substituent. Further, the heterocyclic group may or may not have an aromatic property.
- Preferred heterocyclic groups include pyrrolyl, pyridyl, quinolyl, and phenyl. And furyl groups.
- substituent represented by X i to X 6 is a halogen atom
- examples of the halogen atom include fluorine, chlorine, bromine, and iodine.
- the substituent represented by X i to X 6 is an amino group
- the amino group may be either substituted or unsubstituted, for example, those having the above-mentioned alkyl group and aryl group. There may be.
- the total number of carbon atoms of the amino group is preferably 0 to 20.
- Preferred amino groups include a narrowly defined amino group (one NH 2 ), a methylamino group, an ethylamino group, a phenylamino group, a dimethylamino group, a diphenylamino group, and the like.
- the fluoranthene ring has no substituent or an alkyl group, an alkoxy group or an aryl group (more preferably an alkyl group). Group or aryl group) is particularly preferable.
- the vinyl polymer according to the present invention may be one kind of homopolymer (homopolymer) of the compound represented by the general formula (1) or (2), Two types of compounds represented by the general formula (1) or (2)
- the above copolymer (copolymer) may be used. That is, the polymer is a polymer having one or both of the structural units represented by the following general formula (49) or (50).
- the polymer may be a copolymer of the compound represented by the general formula (1) or (2) and a vinyl monomer having a structure different from that of the compound.
- 4-vinylpyridine represented by the following formula (51), 2-bulpyridine represented by the following formula (52), and the following formula (53) 1-vinylimidazole represented by can be used in combination.
- N-bulcarbazole represented by the following formula (54), (4-1-bulfenol) dipheniramine represented by the following formula (55), etc. Can be used in combination.
- the ratio of the nomer is not particularly limited, it is preferably 1 to 50 mo 1%, more preferably 1 to 30 Hi 1% based on the total amount of the polymerizable monomer constituting the polymer.
- the polymerization method in the case of polymerizing the compound represented by the general formula (1) or (2) is not particularly limited, and can be easily obtained by a radical polymerization method, a cationic polymerization method, an anion polymerization method, or the like. It can be polymerized. Further, the weight average molecular weight of the obtained polymer is preferably from 100,000 to 1,000,
- the organic layer included in the organic EL element contains the above-mentioned polymer, so that the hole and the electron transportability (injected from each of the first and second electrode layers into the organic layer) can be improved.
- the luminous efficiency can be sufficiently improved by increasing the electron transportability).
- such a polymer has high heat resistance and excellent stability, a high level of luminous efficiency can be stably obtained over a long period of time.
- FIG. 1 is a schematic sectional view showing a preferred embodiment of the organic EL device of the present invention.
- an anode layer 2 first electrode layer
- an insulator layer 6 are laminated on a substrate 1 in this order.
- An opening is provided in a corresponding portion so that anode layer 2 is exposed.
- an organic layer 3 and a cathode layer 4 second electrode layer are laminated in this order.
- a laminated structure of 2 organic layers, 3 cathode layers 4 is formed.
- the organic layer 3 contains a light emitting dopant and a vial polymer obtained by polymerizing a polymerizable monomer containing a compound represented by the general formula (1) or (2).
- the surface of the organic EL element 9 on the side of the cathode layer 2 is sealed by a sealing plate 5 via a spacer provided on the insulator layer in the non-light emitting region.
- an amorphous substrate such as glass or quartz, a crystalline substrate such as Si, GaAs, ZnSe, ZnS, GaP, InP, Mo, A1, A metal substrate such as Pt, Ir, Au, Pd, and SUS can be used. Further, a thin film of a crystalline or amorphous ceramic, metal, organic material, or the like formed on a predetermined substrate may be used.
- the substrate 1 side is the light extraction side
- a transparent substrate such as glass or quartz
- an inexpensive glass transparent substrate it is preferable to use an inexpensive glass transparent substrate.
- the transparent substrate may be provided with a color filter film, a color conversion film containing a fluorescent substance, a dielectric reflection film, or the like for adjusting the emitted light.
- the anode layer 2 functions as a hole injection electrode for the organic layer 3. Therefore, the material of the anode layer 2 is preferably a material capable of efficiently injecting holes into the organic layer, and more specifically, a material having a work function of 4.5 to 5.5 eV.
- the transmittance at a wavelength of 400 to 700 nm which is the emission wavelength region of the organic EL element, particularly the transmittance at the wavelength of each RGB color.
- the ratio is preferably 50% or more, more preferably 80% or more, and even more preferably 90% or more. If the transmittance of the anode layer 2 is less than 50%, the light emitted from the organic layer 3 is attenuated, and it becomes difficult to obtain the luminance required for image display.
- the anode layer 2 having a high light transmittance can be formed using a transparent conductive film formed of various oxides.
- ITO is particularly preferable because a thin film having a uniform in-plane resistivity can be easily obtained.
- the ratio of S n O 2 for I n 2 0 3 in ITO 1 is preferably 2 0 wt%, 5 to 1 2% by weight is more preferable.
- the ratio of Z n O for I n 2 0 3 in IZO is preferably 1 2-3 2 weight 0/0.
- One of the above materials may be used alone, or two or more thereof may be used in combination.
- composition of the oxide forming the anode layer 2 may slightly deviate from the stoichiometric composition.
- ITO is usually contain 1 11 2 0 3 and 3 n O 2 in the stoichiometric composition, when referring to the composition of the ITO in I n O x ⁇ S n O y, X is 1.0 Y may be within the range of 0.8 to 1.2, and y may be within the range of 0.8 to 1.2.
- the anode layer 2 is made of a transparent material such as silicon oxide (SiO 2 ).
- the work function of the anode layer 2 can be adjusted by adding a suitable dielectric. For example, by adding about 0.5 to 10 mo 1% of SiO 2 to ITO, the work function of ITO is increased, and the work function of the anode layer 2 is set within the above-mentioned preferable range. Can be.
- the thickness of the anode layer 2 is preferably determined in consideration of the light transmittance described above. For example, when an oxide transparent conductive film is used, the film thickness is preferably 50 to 500 nm, more preferably 50 to 300 nm. If the thickness of the anode layer 2 exceeds 500 nm, the light transmittance becomes insufficient and the anode layer 2 may be peeled off from the substrate 1 in some cases. Further, although the light transmittance is improved as the film thickness is reduced, if the film thickness is less than 50 nm, the efficiency of hole injection into the organic layer 3 is reduced and the strength of the film is reduced.
- FIG. 1 shows an example of an organic EL device in which the anode layer 2 is disposed on the substrate 1 and the cathode layer 4 is disposed on the side far from the substrate 1 via the organic layer 3.
- the positions of the anode layer 2 and the cathode layer 4 may be reversed.
- the cathode layer 4 is arranged on the substrate 1, the force S that allows the cathode layer 4 side to be the light extraction side, in this case, the cathode layer 4 satisfies the above-mentioned optical conditions and film thickness conditions preferable.
- an insulator layer 6 in a non-light-emitting region on the anode layer 2.
- the light emission area can be controlled to suppress color bleeding.
- a material of the insulating layer 6, a typical insulating film materials, for example, S 1 0 2 Ya A 1 such as 2 O 3 to can be appropriately selected.
- the thickness of the insulator layer 6 is preferably about 1 to 7 ⁇ m.
- the anode layer 2 is exposed by a photolithography and etching technique in a portion corresponding to the light emitting region of the insulator layer 6.
- An organic layer 3 and a cathode layer 4 (second electrode layer) are laminated on the exposed anode layer 2 in this order. Thereby, electric conduction between the anode layer 2 and the organic layer 3 is ensured.
- the organic layer 3 is a light emitting layer containing a light emitting dopant and the vinyl polymer according to the present invention.
- the dopant for light emission can be appropriately selected depending on the desired light emission color.
- an iridium complex such as tris (2-phenylpyridine) iridium (Ir (ppy) J, 2, 3, 7, 8, 12, 23, 13, 17, 17, 1 8—Otataethyl mono 2 1 H,
- a platinum complex having a porphyrin ring such as 23 H-porphyrin platinum (PtOEP)
- PtOEP 23 H-porphyrin platinum
- the blue light emitting dopant tetraphenylinobutadiene and its derivatives, styrylamine derivatives, fluoranthene derivatives, and the like can be used.
- the ratio of the doping agent for fermentation is preferably 1 to 15% by weight based on the total amount of the polymerizable monomer before the polymerization.
- the organic layer 3 may not include a light emitting dopant other than the vinyl polymer according to the present invention.
- the organic layer 3 contains a dopant for light emission and the vinyl polymer according to the present invention, and further contains another carrier transporting material such as a hole transporting material and an electron transporting material. You may.
- the hole transporting material either a low molecular weight material or a high molecular weight material can be used.
- the hole-transporting low-molecular material include a pyrazoline derivative, an arylamine derivative, a stilbene derivative, and a triphenyldiamine derivative.
- the hole transporting polymer material there are polybulcarpazole and polyethylene dioxythiophene.
- polyamine // polystyrene sulfonic acid copolymer Pani ZP SS
- One of these hole transporting materials may be used alone, or two or more thereof may be used in combination.
- the electron transporting material either a low molecular weight material or a high molecular weight material can be used.
- the electron-transporting low-molecular material include oxadiazole derivatives, anthraquinodimethane and its derivatives, benzoquinone and its derivatives, naphthoquinone and its derivatives, anthraquinone and its derivatives, and tetrathanolanthranodimethane and its derivatives.
- examples of the electron transporting polymer material include polyquinoxaline and polyquinoline. One of these electron transporting materials may be used alone, or two or more thereof may be used in combination.
- the organic layer 3 can be suitably formed by a coating method.
- a coating solution obtained by adding a light emitting dopant, the vinyl polymer according to the present invention, or another carrier transporting material used as necessary to a predetermined solvent is used.
- the solvent of the coating solution is not particularly limited as long as the bullet polymer according to the present invention dissolves and does not cause any trouble during coating.
- organic solvents such as alcohols, hydrocarbons, ketones, and ethers can be used.
- chlorophonorem shiridani methylene, dichloroethane, tetrahydrofuran, t / leen, xylene, cyclohexanone, dimethyl / levonolemamide, and N-methylpyrrolidone.
- the amount of the biel polymer according to the present invention dissolved in the solvent is appropriately selected depending on the structure, molecular weight, and the like of the vinyl polymer, but is preferably 0.1% by weight or more.
- the above-mentioned coating solution is applied so as to cover the opening where the anode layer 2 of the insulator layer 6 is exposed, and the solvent is removed from the coating solution, whereby the organic layer 3 is formed.
- the method for applying the coating solution is not particularly limited, and for example, a spin coating method, a spray coating method, a dip coating method, an ink jet method, a printing method, and the like are applicable.
- the solvent is removed from the coating solution by heating and drying under reduced pressure or an inert gas atmosphere, preferably at a temperature of 30 to 200 ° C, more preferably at a temperature of 60 to 100 ° C. This can be done by doing so.
- the thickness of the organic layer 3 is not particularly limited and varies depending on the formation method, but is preferably 5 to 500 nm, more preferably 10 to 3 nm.
- FIG. 1 shows an example of an organic EL device having a single-layer structure in which the organic layer 3 includes only the light emitting layer containing the light emitting dopant and the bullet polymer according to the present invention.
- the organic layer included in the organic EL device of the present invention may have a multilayer structure in which a plurality of layers are stacked.
- a hole transport layer is disposed between the light emitting layer and the anode layer, and an electron transport layer is disposed between the light emitting layer and the cathode layer.
- It can be an organic layer having a multilayer structure in which a light emitting layer / an electron transport layer is laminated.
- the ability to inject holes and electrons injected into the light emitting layer from the anode layer and the cathode layer, respectively, and the mobility of these charges can be controlled.
- the hole transporting material and the electron transporting material described above can be used as the materials for the hole transporting layer and the electron transporting layer, respectively.
- One or both of the light emitting layer and the electron transporting layer contain the vinyl polymer according to the present invention. It is particularly preferable that both the light emitting layer and the electron transport layer contain the polymer. Thereby, the heat resistance, lifetime, and luminous efficiency of the organic EL element can be further improved.
- the cathode layer 4 functions as a layer for injecting electrons into the organic layer 3.
- the cathode layer 4 include an inorganic electron injection layer, an electron injection layer formed of a coating film of an organometallic complex, and an electron injection layer formed of a coating film of a metal salt.
- a laminate in which an auxiliary electrode layer is laminated on these electron injection layers may be used as the cathode layer 4. In the case of such a laminate, the inorganic electron injection layer, the coating film of the organometallic complex, and the coating film of the metal salt are arranged on the side closer to the organic layer 3, and the auxiliary electrode layer is arranged on the side farther from the organic layer 3.
- an inorganic electron injection layer When forming an inorganic electron injection layer, it is preferable to select an inorganic material having a low work function so that electron injection into the organic layer 3 becomes easy.
- inorganic materials include lithium metal such as Li, Na, K, and Cs; alkaline earth metals such as Mg, Ca, Sr, and Ba; and LiF, CsI. And the like.
- metals having characteristics similar to alkali metals or alkaline earth metals such as La, Ce, Sn, Zn, and Zr can be used.
- Ca is particularly preferable because of its extremely low work function.
- the thickness of the inorganic electron injection layer is not particularly limited as long as electrons can be injected into the organic layer 3, but is preferably used when Al metal or Al earth metal is used. Is from 0.1 to 100 nm, more preferably from 1,0 to 50 nm.
- the film thickness when using an alkali halide is From the viewpoint of the ability to inject electrons into the organic layer 3, the thickness is preferably as thin as possible. Specifically, the thickness is preferably 10 nm or less, more preferably 1 nm or less.
- the electron injection layer composed of a coating film of an organometallic complex is formed, for example, by applying a coating solution obtained by adding an organometallic complex to a predetermined solvent onto the organic layer 3 by a coating method such as spin coating. It can be formed by coating and removing the solvent from the coating solution.
- organometallic complexes -diketonato complexes, quinolinol complexes and the like can be used.
- the metal of the organometallic complex is not particularly limited as long as it has a low work function.
- metal such as Li, ⁇ a, K, and Cs, Mg, Ca, Sr, and B Alkaline earth metals such as a, and alkali metals such as La, Ce, Sn, Zn, and Zr, or metals having properties similar to those of alkaline earth metals.
- alkali metals such as La, Ce, Sn, Zn, and Zr, or metals having properties similar to those of alkaline earth metals.
- the thickness of the electron injection layer formed of the coating film of the organometallic complex is preferably as thin as possible from the viewpoint of the electron injection ability to the organic layer 3, specifically, 10 nm or less, and preferably 1 nm or less. More preferred.
- the total film thickness of the electron injection layer composed of the coating film of the organic gold complex and the protective electrode layer is such that electrons can be injected into the organic layer 3.
- the thickness of the entire cathode layer 4 is preferably 50 to 500 nm, though not particularly limited as long as it is provided. If the thickness of the protective electrode layer with respect to the electron injection layer is too small, the above-mentioned effects cannot be obtained sufficiently. If the thickness of the auxiliary electrode is too large, the stress due to the auxiliary electrode layer increases and dark spots are formed. Long speed tends to increase.
- the electron injection layer formed of a coating film of a metal salt is formed by applying a coating solution obtained by adding a metal salt to a predetermined solvent onto the organic layer 3 by a coating method such as a spin coating method. Can be formed by removing the solvent from
- the metals contained in such metal salts include Ag, Al, Au, Be, Bi, Co, Cu, Fe, Ga, Hg, Ir, Mo, Mn, N b, Ni, Os, Pb, Pd, Pt, Re, Ru, Sb, Sn, Ti, Zr, and the like.
- the metal salt may be either an organic metal salt or an inorganic metal salt.
- organic metal salt include a substituted or unsubstituted aliphatic carboxylate, divalent carboxylate, aromatic carboxylate, alcoholate, phenolate, dialkylamide and the like.
- inorganic metal salt include halides.
- the aliphatic carboxylic acid of the aliphatic carboxylate may be any of a saturated aliphatic carboxylic acid and an unsaturated aliphatic carboxylic acid.
- saturated aliphatic carboxylate include metal salts such as acetic acid, propionic acid, octanoic acid, isooctanoic acid, decanoic acid, and lauric acid.
- unsaturated aliphatic carboxylate include metal salts such as oleic acid, ricinoleic acid, and linoleic acid.
- divalent carboxylate examples include metal salts of a divalent carboxylic acid such as citric acid, linoleic acid, and oxalic acid.
- aromatic carboxylate benzoic acid, o-tert-butynolebenzoic acid, m-tert-butynolebenzoic acid, p-tert-butylbenzoic acid, salicylic acid, m-hi Metal salts such as droxybenzoic acid and p-hydroxybenzoic acid are mentioned, and among them, metal salts of salicylic acid are preferred.
- Alcoholates are metal salts of alcohols.
- alcohol components constituting alcohol include primary alcohols such as ethanol, n-propyl alcohol, and n -butyl alcohol, secondary alcohols such as iso-butanol pyranolecole and isobutyl alcohol, and te.
- Tertiary alcohols such as rt-butyl alcohol and the like can be mentioned.
- Phenolate is a metal salt of phenols.
- the number of hydroxyl groups contained in the phenol component constituting the phenol is not particularly limited, but is preferably one or two. Further, such a phenol component may have a substituent (preferably a linear or branched alkyl group having 1 to 8 carbon atoms) in addition to the hydroxyl group.
- phenol, naphthol, 4-phenylphenol and the like are preferably used.
- halide as an inorganic metal salt examples include metal salts such as chlorine, fluorine, bromine, and iodine.
- auxiliary electrode layer On these electron injection layers. — Thereby, the efficiency of electron injection into the organic layer 3 can be improved, and the intrusion of moisture or organic solvent into the organic layer 3 or the electron injection layer can be prevented.
- a general metal can be used because there is no restriction on the work function and the charge injection ability, but it is preferable to use a metal having high conductivity and easy handling.
- the electron injection layer contains an organic material, it is preferable to appropriately select the electron injection layer according to the type of the organic material, the adhesiveness, and the like.
- Specific examples of the material used for the auxiliary electrode layer include A1, Ag, In, Ti, Cu, Au, Mo, W, Pt, Pd, and Ni.
- low resistance metals such as A1 and Ag can further increase the electron injection efficiency.
- a metal compound such as TiN, a higher sealing property can be obtained.
- One of these materials may be used alone, or two or more thereof may be used in combination. When two or more metals are used, they may be used as an alloy.
- the cathode layer 4 side of the organic EL element 9 is By sealing, deterioration of the organic layer 3, and furthermore, the anode layer 2 and the cathode layer 4 can be prevented.
- the spacer 7 is arranged in the non-light-emitting region on the insulating layer 6 and the spacer 7 and the sealing plate 5 are bonded to each other, so that the surface of the organic EL element 9 on the cathode layer 4 side and the sealing plate 5 can be prevented from contacting.
- the spacer 7 may be any of an organic material and an inorganic material (including a metal material).
- the spacer 7 can be formed by a method such as photolithography using a photosensitive material such as a photo resist or a photosensitive polyimide.
- the adhesive may be mixed with an insulator such as a glass spacer, and the mixture may be applied to a region where the spacer 7 is formed.
- a space formed by the surface of the organic EL element 9 on the cathode layer 4 side, the sealing plate 5 and the spacer 7 is preferably filled with a sealing gas.
- a sealing gas it is preferable to use an inert gas such as Ar or He.
- the moisture content of the sealing gas is preferably 100 ppm or less, more preferably 10 ppm or less, and still more preferably 1 ppm or less.
- the lower limit of the water content of the sealing gas is not particularly limited,
- a value of about 0.1 ppm is very preferable because the effect of preventing deterioration of the organic layer 3, the anode layer 2, the cathode layer 4 and the like is high.
- organic EL devices are used in various fields of optical devices such as organic EL displays, optical pickups used for reading / writing of memories, relay devices provided on transmission lines of optical communication, photobras, and the like. Very useful in. Next, the organic EL display of the present invention will be described.
- FIG. 2 is a block diagram showing a preferred embodiment of the organic EL display of the present invention.
- the organic EL display shown in Fig. 2 is of a passive drive type, and is a color conversion type organic EL display using a blue light emitting element as an excitation light source.
- the color conversion method is a method in which three color fluorescent elements are excited by visible light emission of high energy rays.
- blue light is generated in the organic layer of the organic EL device, and the green light and red light are often obtained by exciting the green and red phosphor screens using the blue 'light as the excitation light energy beam. It is called a color conversion method because blue is converted to green and red.
- the display section 14 includes a substrate 1, an anode layer 2 (first electrode layer) formed on one side of the substrate 1, and an organic layer formed on the anode layer 2. 3, and a plurality of organic EL elements 9 composed of a cathode layer 4 (second electrode layer) formed on the organic layer 3 are two-dimensionally arranged.
- the vinyl polymer and the blue light emitting dopant according to the present invention correspond to three light emitting regions (for example, 13a, 13b, and 13c). Are formed to form three organic layers 3 (light-emitting layers).
- One of the three light emitting regions is a blue light emitting region, and the other two are a green light emitting region and a red light emitting region.
- a transparent or translucent material such as glass, quartz, and resin is preferable.
- a fluorescence conversion finoletter film is provided in a region corresponding to two of the three light emitting regions formed in one organic EL element. Then, the emission color is controlled by the fluorescence conversion filter film, and a green light emission region and a red light emission region are obtained. Fluorescence conversion filter The light-emitting region where no tar film is provided is a blue light-emitting region.
- the fluorescence conversion filter film absorbs light due to electroluminescence in the organic layer 3 and emits light of a color different from the absorbed light from the phosphor in the film to perform color conversion of the emission color. And generally includes a phosphor, a light absorber, and a binder.
- the formation of one film of the fluorescence conversion filter can be performed by patterning using a technique such as photolithography and printing.
- the material of the fluorescence conversion filter film is preferably a material that can form fine patterns, and a material that is not easily damaged in the process of forming the upper layer (eg, anode layer 2).
- the phosphor contained in the fluorescence conversion filter film one having a high fluorescence quantum yield is preferable, and one having a high light absorption in the light emission wavelength region of a light emitting element such as a laser dye is preferred.
- a light emitting element such as a laser dye
- examples of such a phosphor include a rhodamine compound, a perylene compound, a cyanine compound, a phthalocyanine compound containing a subphthalide, a naphthaimide compound, and a condensed ring hydrocarbon compound. And condensed heterocyclic compounds, styryl compounds, coumarin compounds and the like.
- a light absorber When the light absorption of the phosphor itself is insufficient, it is preferable to use a light absorber together, and it is preferable that the light absorber does not quench the fluorescence.
- the binder is not particularly limited as long as it does not quench the fluorescence, and can be appropriately selected from known binders and used. [0806] Further, when a color filter that excites the short-wavelength diplomacy that can be absorbed by the constituent materials of the organic EL element 9 and the fluorescence conversion filter film is combined with the fluorescence conversion filter film, the light resistance and display of the element are improved. It is preferable because the contrast is further improved.
- the two anode layers 2 are arranged such that they pass through the three light emitting areas 13a to 13c of the organic EL element 9, respectively. They are formed in parallel with each other on the plate 1 and the fluorescence conversion filter film.
- the anode layer 2 is arranged so as not to completely cover the light emitting regions 13a to 13c, but to expose a part of each of the light emitting regions 13a to 13c.
- the anode layer 2 is a common electrode of a plurality of (two in FIG. 2) organic EL elements, and a power supply unit 8 described later is electrically connected to one end of each anode layer 2.
- Such a striped anode layer 2 can be formed, for example, by forming an ITO film on a substrate 1 on which a film of a fluorescence conversion filter is patterned, and then performing a patterning and a jetting process. is there.
- the organic layer 3 containing the vinyl polymer and the blue light emitting dopant according to the present invention includes the anode layer 2 corresponding to each light emitting region of the organic EL element 9. It is formed so as to cover the light-emitting region over the area.
- the organic layer 3 can be suitably formed by a coating method such as a spin coating method.
- each of the cathode layers 4 is a common electrode of a plurality of (two in FIG. 2) organic EL elements, and a switching section 10 described later is electrically connected to one end of each of the cathode layers 4.
- the striped anode layer 2 and the striped cathode layer 4 are connected to each other. It is preferable to arrange them so as to be orthogonal to each other. At this time, the intersection between the anode layer 2 and the cathode layer 4 in each light emitting region is a distance. One pixel of play.
- a spacer 7 is provided for each organic EL element 9. By bonding a sealing plate (not shown) to the spacer 7, the surface on the cathode layer 4 side is sealed.
- a driving unit 11 for controlling the display in 14 is a power supply unit 8 for supplying a current or a voltage to the anode layer 2 and the cathode layer 4, a switching unit 10 for sending a blinking control signal to the organic EL element 9, and It is configured to include these control logic circuits 12.
- the power supply section 8 is electrically connected to the anode layer 2 and the switching section ⁇ 0 is electrically connected to the cathode layer 4, respectively.
- the power supply section 8 and the switching section 10 are electrically connected via the control logic circuit 12. Connected.
- the drive method of the organic EL element 9 in the display unit 14 is not particularly limited, and for example, DC drive, pulse drive, AC drive, and the like are applicable. In driving, it is preferable to supply a DC, pulse or AC current or voltage, and the applied voltage is preferably about 2 to 30 V.
- the organic EL display of the present invention is the same as that of the above embodiment. It is not limited, and can be determined in consideration of the required brightness, life, power consumption, cost, etc. of the assumed display product. For example
- FIG. 2 shows a so-called passive drive type organic EL display
- the organic EL display of the present invention may be an active drive type full power display using polysilicon TFT or the like.
- full-color display is realized by forming light-emitting elements of three primary colors of red, green, and blue (RGB).
- the color display method may be any of the RGB three-color juxtaposition method, the white light emission method, and the like in addition to the color conversion method described in the above embodiment.
- the RGB three-color juxtaposition system is a display system in which light-emitting elements of RGB three colors emit light.
- the white light emission method is a method in which a part of the wavelength of white light emission is emphasized by a three-color filter used in a liquid crystal display device or the like to perform full color display. In the case of the white light-emitting method and the color conversion method, it is not necessary to prepare light-emitting elements of three colors, and the formation of the light-emitting elements can be simplified, and the area can be easily increased.
- a light emitting dopant to be added to the light emitting layer of the organic EL element is appropriately selected, so that any of the above color display methods can be applied. be able to.
- a color conversion method can be preferably applied by adding a dopant for blue light emission to the organic layer of the organic EL device to form a light emitting layer.
- the RGB three-color juxtaposition method using phosphorescence can be preferably applied. [0 0 9 8] [Example]
- a polyethylenedioxythiophene Z polystyrenesulfonic acid having structural units represented by the following formulas (62) to (64) is provided on a substrate on which an ITO film as an anode layer is formed.
- a coating solution containing the copolymer (PE DOT / PSS) was applied by a spin coating method and vacuum dried at 110 ° C. for 5 minutes to form a hole transport layer having a thickness of 500 A.
- the above-mentioned coating solution for forming a light emitting layer was applied, and vacuum dried at 110 ° C. for 5 minutes to form a light emitting layer having a thickness of 1000 A.
- a LiF layer (thickness: 6 A) as an electron injection layer and an A1 layer (thickness: 250 OA) as an auxiliary electrode are vacuum-deposited on the light emitting layer in this order.
- a cathode layer was formed, and the surface on the cathode layer side was sealed to obtain a target organic EL device.
- PVK Polyvinylcarbazole represented by the following formula (65) as a hole-transporting host polymer, and the bullet polymer obtained in Example 1
- a light emitting layer is formed using the coating solution obtained as described above.
- An organic EL device was produced in the same manner as in Example 1 except for the above.
- blue light emission derived from a vinyl polymer having 3- (4-1-phenylphenyl) 17, 12-diphenylbenzofluoranthene as a monomer unit was obtained, and the current efficiency was 1%. It was 1.0 cd / A when driven at a constant current of 0 mA / cm 2 . Further, 1 0 m was carried out life test by constant current driving movement of AZ cm 2, the luminance half life was 2 0 0 h
- Example 1 3- In the same manner as in Example 1 3- (4 one Binirufueniru) form if the Bulle polymer as one 7, 1 2-diphenyl E sulfonyl benzofluoranthene monomer units, 2 weight 0/0 toluene solution of the polymer Prepared. Further, as a blue emitting dopant, the Tetorafue two Norebutajen represented by the following formula (6 6), was added at a ratio of 2 weight 0/0 of the monomer units in the vinyl Honoré polymers, fabric for forming a light emitting layer A liquid was obtained.
- An organic EL device was produced in the same manner as in Example 1 except that a light-emitting layer was formed using the coating solution thus obtained.
- blue light emission derived from tetraphenylbutadiene was obtained, and its current efficiency was 2.1 cd / A when driven at a constant current of 10 mAZcm 2 . Further, 1 0 m life attempt by the constant current drive A / cm 2 The brightness half life was 330 hours.
- the molar ratio of the polyvinyl carbazole represented by the above formula (65) to oxaziazole represented by the following formula (67) as an electron transporting molecule is represented by the following formula:
- An organic EL device was produced in the same manner as in Example 1 except that a light-emitting layer was formed using the coating solution thus obtained.
- poly-1 (4-vinylinolephenyl) -2,2 One (3,7,12-triphenylbenzophnoleolanthene) Blue emission originating from one inoleamine was obtained, and its current efficiency was 3.0 cd when driven at a constant current of 1 O mA / cm 2. No A.
- a life test was performed by a constant current drive of 10 mA cm 2 , and the luminance half life was 500 hours.
- An organic EL device was produced in the same manner as in Example 1 except that a light-emitting layer was formed using the coating solution thus obtained.
- blue light emission derived from the fluoranthene structure of the vinyl copolymer was obtained, and the current efficiency was 2.5 cdZA when driven at a constant current of 10 mAZcm 2 .
- the luminance half life was 350 hours.
- Example 6 A 2.0% by weight toluene solution of bielcopolymer was prepared in the same manner as in Example 5, and tetraphenylbutadiene was added as a luminescent dopant at a ratio of 2% by weight based on the monomer unit in the vinyl polymer. This was a layer coating solution.
- An organic EL device was produced in the same manner as in Example 1 except that a light-emitting layer was formed using the coating solution thus obtained.
- blue light emission derived from the fluoranthene structure of the vinyl copolymer and tetraphenylbutadiene was obtained, and the current efficiency was 2.5 cd ZA when driven at a constant current of 10 mA / cm2. .
- the luminance half life was found to be 400 hours.
- Example 4 Example 1 was repeated except that polyvinylcarbazole (PVK) was used in place of the vinyl polymer having monomer units of 4- (1-bierphenyl) -1,4-diphenyl-benzofluoranthene in Example 1.
- An organic EL device was produced in the same manner as in 1. In the obtained organic EL device, blue light emission derived from tetraphenylbutadiene was obtained, and the current efficiency was 1.6 cd ZA when driven at a constant current of 10 mA / cm 2 . In addition, when a life test was performed with a constant current drive of l O mAZ cm 2 , the luminance half life was only 4 hours.
- PVK polyvinylcarbazole
- Example 2 a coating solution containing PEDOT / PSS was applied on an ITO substrate and dried to form a hole transport layer having a thickness of 500 A.
- Tetraphenylbutadiene was added as a dopant at a ratio of 3% by mass to the solid content of CN-PPP to prepare a coating solution for forming a light emitting layer.
- An organic EL device was produced in the same manner as in Comparative Example 2 except that a light emitting layer was formed using this coating solution. The obtained organic EL device emitted blue light, but had a current efficiency of less than 0.1 cd ZA when driven at a constant current of 10 mAZ cm 2 .
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Electroluminescent Light Sources (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/550,873 US7425375B2 (en) | 2003-03-28 | 2004-03-29 | Organic EL element and organic EL display |
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| JP2003092621A JP4293592B2 (ja) | 2003-03-28 | 2003-03-28 | 有機el素子及び有機elディスプレイ |
| JP2003-092621 | 2003-03-28 |
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| Country | Link |
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| US (1) | US7425375B2 (ja) |
| JP (1) | JP4293592B2 (ja) |
| WO (1) | WO2004095888A1 (ja) |
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| WO2006114364A1 (de) * | 2005-04-28 | 2006-11-02 | Basf Aktiengesellschaft | Synthese von phenylsubstituierten polyfluoranthenen und ihre verwendung |
| US8632894B2 (en) * | 2005-06-22 | 2014-01-21 | Seiko Epson Corporation | Substrate for electronic device, method for manufacturing the substrate for electronic device, electronic device provided with the substrate for electronic device, and electronic equipment provided with the electronic device |
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| US20070085061A1 (en) * | 2005-10-14 | 2007-04-19 | Elder Delwin L | Conductivity enhancement of conductive polymers by solvent exposure |
| JP5000937B2 (ja) * | 2006-06-30 | 2012-08-15 | 三菱電機株式会社 | 半導体デバイスの製造方法 |
| US8277955B2 (en) * | 2006-10-17 | 2012-10-02 | Seiko Epson Corporation | Compound for organic EL device and organic EL device |
| CN101595080B (zh) | 2006-11-15 | 2013-12-18 | 出光兴产株式会社 | 荧蒽化合物和使用该荧蒽化合物的有机电致发光元件以及含有机电致发光材料的溶液 |
| JP4811314B2 (ja) * | 2007-03-27 | 2011-11-09 | セイコーエプソン株式会社 | 有機elデバイス |
| KR100899423B1 (ko) * | 2007-08-16 | 2009-05-27 | 삼성모바일디스플레이주식회사 | 유기전계발광소자 및 그의 제조방법 |
| US20090110956A1 (en) * | 2007-10-26 | 2009-04-30 | Begley William J | Oled device with electron transport material combination |
| US8129039B2 (en) * | 2007-10-26 | 2012-03-06 | Global Oled Technology, Llc | Phosphorescent OLED device with certain fluoranthene host |
| US8420229B2 (en) * | 2007-10-26 | 2013-04-16 | Global OLED Technologies LLC | OLED device with certain fluoranthene light-emitting dopants |
| US8076009B2 (en) | 2007-10-26 | 2011-12-13 | Global Oled Technology, Llc. | OLED device with fluoranthene electron transport materials |
| US8431242B2 (en) * | 2007-10-26 | 2013-04-30 | Global Oled Technology, Llc. | OLED device with certain fluoranthene host |
| JPWO2009075203A1 (ja) * | 2007-12-11 | 2011-04-28 | 出光興産株式会社 | 高分子化合物及びそれを用いた有機エレクトロルミネッセンス素子 |
| GB2463040B (en) * | 2008-08-28 | 2012-10-31 | Cambridge Display Tech Ltd | Light-emitting material |
| US7931975B2 (en) * | 2008-11-07 | 2011-04-26 | Global Oled Technology Llc | Electroluminescent device containing a flouranthene compound |
| US8088500B2 (en) | 2008-11-12 | 2012-01-03 | Global Oled Technology Llc | OLED device with fluoranthene electron injection materials |
| US7968215B2 (en) * | 2008-12-09 | 2011-06-28 | Global Oled Technology Llc | OLED device with cyclobutene electron injection materials |
| US20110315964A1 (en) * | 2009-03-11 | 2011-12-29 | Idemitsu Losan Co., Ltd. | Novel polymerizable monomer, and material for organic device, hole injection/transport material, material for organic electroluminescent element and organic electroluminescent element each comprising polymer (polymeric compound) of the polymerizable monomer |
| DE102010006377A1 (de) | 2010-01-29 | 2011-08-04 | Merck Patent GmbH, 64293 | Styrolbasierte Copolymere, insbesondere für die Anwendung in optoelektronischen Bauteilen |
| JP5754165B2 (ja) * | 2010-02-25 | 2015-07-29 | 住友化学株式会社 | ベンゾフルオランテン系高分子化合物 |
| WO2016026123A1 (en) | 2014-08-21 | 2016-02-25 | Dow Global Technologies Llc | Compositions comprising oxygen substituted benzocyclobutenes and dienophiles, and electronic devices containing same |
| US10308735B2 (en) * | 2014-12-18 | 2019-06-04 | Samsung Electronics Co., Ltd. | Material for organic light-emitting device and organic light-emitting device including the same |
| KR102539840B1 (ko) * | 2021-09-29 | 2023-06-07 | 재단법인 나노기반소프트일렉트로닉스연구단 | 부착형 마이크로폰 및 그의 제조방법 |
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| US8137822B2 (en) | 2005-04-28 | 2012-03-20 | Basf Aktiengesellschaft | Synthesis of phenyl-substituted polyfluoroanthenes and the use thereof |
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| US8632894B2 (en) * | 2005-06-22 | 2014-01-21 | Seiko Epson Corporation | Substrate for electronic device, method for manufacturing the substrate for electronic device, electronic device provided with the substrate for electronic device, and electronic equipment provided with the electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4293592B2 (ja) | 2009-07-08 |
| JP2004303488A (ja) | 2004-10-28 |
| US20060238110A1 (en) | 2006-10-26 |
| US7425375B2 (en) | 2008-09-16 |
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