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WO2007032526A1 - Panneau d'affichage electroluminescent organique - Google Patents

Panneau d'affichage electroluminescent organique Download PDF

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Publication number
WO2007032526A1
WO2007032526A1 PCT/JP2006/318469 JP2006318469W WO2007032526A1 WO 2007032526 A1 WO2007032526 A1 WO 2007032526A1 JP 2006318469 W JP2006318469 W JP 2006318469W WO 2007032526 A1 WO2007032526 A1 WO 2007032526A1
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WO
WIPO (PCT)
Prior art keywords
organic
material film
display panel
inorganic material
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/318469
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English (en)
Japanese (ja)
Inventor
Ayako Yoshida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Corp filed Critical Pioneer Corp
Publication of WO2007032526A1 publication Critical patent/WO2007032526A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/351—Thickness
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light

Definitions

  • the present invention relates to an organic electroluminescence display panel.
  • an organic electroluminescence display panel (hereinafter referred to as an organic EL display panel) using an organic light emitting material having an electroluminescence property as an emission source is known.
  • the organic EL display panel supports an organic electroluminescent element (hereinafter referred to as an organic EL element) in which an organic functional layer having an optical function is sandwiched between an anode and a cathode, and the organic EL element.
  • an organic EL element organic electroluminescent element
  • an organic functional layer having an optical function is sandwiched between an anode and a cathode, and the organic EL element.
  • a plurality of organic EL elements on the substrate for example, a matrix ⁇ ! It is lined up with a dog.
  • the anode is made of a material having a high work function such as indium tin oxide (ITO).
  • the cathode is formed using a material having a low work function, that is, ⁇ based on alkali metal and alkaline earth metal.
  • the organic functional layer includes functional layers such as a hole injection layer, a positive LH5 transport layer, a light emitting layer, an electron transport layer, and an electron injection layer.
  • the organic functional layer is, for example, a single layer made of an organic compound material and having only a light emitting layer, or a three-layer structure of an organic hole transport layer, a light emitting layer, and an organic electron transport layer, or an organic hole transport layer and a light emitting layer.
  • a two-layer structure of layers, and a laminate in which an electron or hole injection layer or a carrier block layer is inserted between these appropriate layers can be obtained.
  • an organic EL device having such a configuration, when as is applied between the anode and the cathode, holes and Electrons are injected into the organic functional layer, and these recombine in the light emitting layer to emit light. Such light is emitted to the outside through a substrate or the like.
  • red (R), green (G), and blue (B) light emission vectors emitted from organic EL elements have a wide peak width (especially the red spectrum).
  • display panels it was difficult to improve color reproducibility using only the light emission spectra of the organic light emitting materials of each color.
  • Such an organic EL device has a first electrode made of a light reflecting material such as platinum (P t), gold 1 (A u) or the like on the substrate, a semi-functional layer such as an organic functional layer, magnesium, silver, or an alloy thereof.
  • the transparent reflective layer and the second electrode are stacked in sequence.
  • the resonator structure includes a first electrode, an organic functional layer, and a translucent reflective layer, and an organic function) is a resonance part.
  • a resonating section is configured to act as a filter by setting the thickness of the organic functional layer to a predetermined condition, and is configured to cause multiple interference in the vicinity of the wavelength ⁇ of light to be extracted.
  • the thickness of the resonance part to be a filter must be set for each color to be extracted.
  • the thickness of the organic functional layer is adjusted to the desired wavelength of light so that the peak of the wavelength of light to be extracted matches the peak of interference. Must be set.
  • the thickness of the organic functional layer that is optimal for the extracted light does not match the thickness of the organic functional layer in which the electrical characteristics (such as electron and hole injection efficiency) of the organic EL element are optimal. A situation may occur.
  • the distance of the resonance part that is, the thickness of the organic functional layer
  • Spectral characteristics may change, and the emission intensity of light of a desired wavelength may be reduced.
  • wet processing it is difficult to control the thickness of the thin film by wet processing compared to dry processing such as vapor deposition. Changes in characteristics are likely to occur.
  • the object of the present invention is to provide means for solving various problems mentioned above as an example.
  • An organic EL display panel comprises an organic EL element comprising an organic functional layer including a light emitting layer that emits light of wavelength ⁇ , and first and second display electrodes sandwiching the organic functional layer, and the organic EL element.
  • An organic tanned display panel having a substrate and a composite layer comprising an inorganic material film and an organic material film provided between the substrate and the organic EL element, the organic material film The refractive index of the organic material film is smaller than the refractive index of the inorganic material film, and the optical distance L of the organic material film is
  • FWHM refers to the full width at half maximum of the emission spectrum.
  • An organic EL display panel comprises an organic EL element comprising an organic functional layer including a light emitting layer that emits light of wavelength ⁇ , and first and second display electrodes sandwiching the organic functional layer, and the organic EL element.
  • An organic EL display panel having a substrate, wherein the organic EL element is sealed by the substrate and a composite layer composed of an inorganic material film and an organic material film, and the organic material film The refractive index of the organic material film is smaller than the refractive index of the inorganic material film, and the optical distance of the organic material film is
  • PL refers to the emission spectrum of the organic light-emitting material contained in the light-emitting layer
  • FWHM refers to the half-value width of the light-emitting spectrum.
  • FIG. 1 is a cross-sectional view of an organic EL display panel according to the present invention.
  • Figure 2 shows the interference spectrum of the composite layer in the organic EL display panel according to the present invention (Figure 2 (a)), the internal emission spectrum of the organic EL element ( Figure 2 (b)), and the spectrum of the emitted light ( Figure 2 (c)).
  • Figure 2 (a) shows the interference spectrum of the composite layer in the organic EL display panel according to the present invention
  • Figure 2 (b) shows the internal emission spectrum of the organic EL element
  • Figure 2 (c) the spectrum of the emitted light
  • Fig. 3 is a chromaticity diagram of an organic EL display panel.
  • FIG. 4 is a schematic cross-sectional view of a modification of the organic EL display panel according to the present invention.
  • the organic EL display panel 1 has a substrate 2 and one of both main surfaces of the substrate 2. And a first inorganic material film 3 provided on the main surface.
  • the substrate 2 is made of a resin substrate made of a resin material such as polycarbonate PC) or a glass substrate.
  • the first inorganic material film 3 is made of an inorganic material such as silicon oxide (S i 0 2 ), silicon nitride (S i N x ), silicon nitride oxide (S i ON), and aluminum oxide (A 1 2 0 3 ). It has a light transmission property that turns the light in the visible light region.
  • An organic material film 4 is provided on the first inorganic material film 3.
  • the organic material film 4 is made of a resin material such as a thermosetting resin or an ultraviolet curable resin.
  • the refractive index of the organic material film 4 is smaller than the refractive index of the first inorganic material film 3.
  • the organic material film 4 may be a functional layer such as a color conversion layer (CCM layer) or a color filter layer. .
  • the organic material film 4 is formed using a wet coating method such as a spin coating method!
  • a wet coating method such as a spin coating method
  • a liquid thermosetting resin or ultraviolet curable resin before curing is disposed on the first inorganic material film by using a spin coating method, and then the uncured resin film. It is also possible to cure and form an organic material film.
  • the organic material film includes a koto film formed by a wet method, and is close to an inorganic material, that is, a material soluble in an organic solvent such as polysilazane and silica particles used in a sol-gel method.
  • an inorganic material that is, a material soluble in an organic solvent such as polysilazane and silica particles used in a sol-gel method.
  • a film made of a mixed material in which inorganic particles such as the above are mixed and dispersed in a resin material is also included.
  • a second inorganic material film 5 having substantially the same configuration as the first inorganic material film 3 described above is provided. That is, the organic material film 4 is sandwiched between the first and second inorganic material films 3 and 5, and the composite layer 6 is formed by the first and second inorganic material films 3 and 5 and the organic material film 4 having such a configuration. Is formed.
  • an organic EL element 10 is provided in which an organic functional layer 8 including the second display electrode 9 and the second display electrode 9 are sequentially formed.
  • the organic functional layer 8 is made of an organic compound material and includes a light emitting layer (not shown) that emits light having a wavelength ⁇ .
  • the organic functional layer 8 is a hole injection layer made of copper phthalocyanine.
  • Ding PD triphenylamine derivative
  • AI q 3 aluminum chelate complex
  • Lithium oxide electricity It is good also as a laminated body which consists of a child injection layer (not shown).
  • the second display electrode 9 is made of a metal material such as aluminum (AI).
  • the light emitted from the organic functional layer 8 of the organic EL element 10 having such a configuration is emitted to the outside through the substrate 2.
  • the organic EL element 10 may be covered and sealed with a member that does not allow gas such as oxygen and moisture to escape, that is, a so-called gas barrier property.
  • a member that does not allow gas such as oxygen and moisture to escape that is, a so-called gas barrier property.
  • a sealing film made of an inorganic material such as silicon oxide, silicon nitride, silicon nitride silicon oxide, or a can-sealed plate made of glass or metal having a recess.
  • the composite layer 6 has a structure in which the low refractive index organic material film 4 is sandwiched between the first and second inorganic material films 3 and 5 having a high refractive index.
  • the composite layer 6 acts as an interference filter in which the light emitted from the organic functional layer 8 interferes while reflecting between the first and second inorganic material films 3 and 5. That is,
  • the organic EL display panel 1 has a structure in which an interference filter layer is formed outside the organic EL element ⁇ 0. Note that, in order to simplify the explanation, one organic EL element is shown in FIG.
  • the organic EL display panel is formed with multiple organic EL elements. May be.
  • the plurality of organic EL elements may be arranged in a matrix, for example, on the substrate. '
  • the organic material display 4 will be described in more detail by taking the single-layer organic display panel 1 in which the organic material film 4 is made of a single organic material as an example.
  • ⁇ is the wavelength of the light to be extracted
  • d is the thickness of the organic material film 4
  • n is the refractive index of the organic material film 4.
  • the interval between wavelengths to be intensified ( ⁇ ) is ⁇ (m) when the order is m, and ⁇ (m + 1) when the order is (m + 1).
  • FWHM the full width at half maximum of the emission spectrum.
  • PL refers to the emission spectrum of the organic light-emitting material contained in the light-emitting layer
  • FWHM refers to the half-value width of the emission spectrum.
  • PL a plurality of interference fringes' peaks appear in the composite layer.
  • the interference peak of the light strengthening in the organic material film 4 is set to appear at least three including the peak at the wavelength ( ⁇ ) of the light to be extracted. . That is,
  • the central interference peak among the three interference peaks that is, the peak at the wavelength ⁇ of the light to be extracted (see Fig. 2 (a)) and the internal emission of the light emitted from the organic EL element
  • the spectrum peak can almost coincide. Therefore, due to multiple interference in the composite layer, the spectrum of the light emitted through the substrate emitted from the panel becomes a spectrum having a peak at or near the wavelength ⁇ of the light to be extracted. ( Figure 2 (c)).
  • it is difficult to control the film thickness of the organic material film and it is difficult to strictly control the thickness of the organic material film, particularly when the organic material film is produced by a wet process such as a spin-collision method. .
  • the organic material film tends to be easily deviated from the predetermined flUl, and accordingly, the peak position of the interference spectrum is easily shifted from the intended position.
  • the organic material film is thin, the number of peaks in the interference spectrum is small and the interval between peaks is wide.
  • the organic material film is thin ( ⁇ 2 / L> FWH M (PL))
  • the spectrum of the light emitted from the substrate is the emission intensity at and around the intended wavelength ⁇ .
  • the interference filter has a high wave selectivity, so the peak width of the light ffiii of the composite layer is narrower than before. As a result, it is emitted from the display channel. The angle dependence of the emission spectrum of the emitted light is increased. In other words, the organic EL display panel color reproduction range H is ensured only in a narrow viewing angle range.
  • the wavelength selectivity of the interference filter is slowed down, it is possible to obtain a light with a professional spectrum almost in line with the internal emission spectrum from the organic EL device. As a result, the angle dependency of chromaticity is reduced, and the color reproducibility of the OLED display panel can be maintained over a wide viewing angle.
  • the display surface of the OLED display panel is placed in front and viewed vertically (in this case, the viewing angle is set to 0 degrees)
  • the green (G) emission is changed from 0 degrees to 60 degrees.
  • the observation angle is changed in 5 degree increments, compared to the case of setting>HWH> FWH (PL) (Fig.
  • the range of change in chromaticity is narrower when set to Fig. 3 (b)).
  • the thickness of the organic material film as described above may be set for each color of red (R), green (G), and blue (B).
  • the thickness of the corresponding organic material film may be set for each organic light emitting element that emits RGB light.
  • the film thickness of the organic material film may be determined in consideration of a phase shift generated when light is reflected at the interface between the organic material film and the inorganic material film, that is, a phase shift.
  • the optical distance L of the organic material film in the composite layer as described above can be obtained by satisfying the condition of the above formula (6). It is more preferable to set it sufficiently smaller than the half width of the light emission spectrum of the light emitting material to be used. For example, the optical distance of the organic material film is
  • such a composite layer is effective in that the wavelength of each RGB color can be adjusted with one composite layer, particularly when the organic EL element emits white light and is set to the condition of the above formula (7). It turns out that there is.
  • the composite layer has an organic material film on a substrate 2 made of glass as shown in FIG. 4, for example, in addition to a three-layer structure in which an organic material film is sandwiched between inorganic material films.
  • the material film 4 is provided directly (this may be a two-layer structure in which the inorganic material film 5 is disposed on the organic material film 4.
  • the composite layer may have a gas barrier property and may function as a gas barrier film. Therefore, even if the configuration of the organic EL display panel is simple, desired emission characteristics can be obtained while extending the emission lifetime of the organic EL element.
  • the composite layer has a composite structure (high fabrication) using an inorganic material film and an organic material film
  • the composite layer can have a good gas barrier property. That is, a minute defect called a pinhole is likely to occur in the inorganic material film, and moisture and the like are easily transmitted through the pinhole.
  • the pinhole is formed by providing an organic material film on the inorganic material film. It can be filled with an organic material to prevent such moisture from entering.
  • the resin substrate may be a flexible film.
  • a flexible organic EL display panel that is thin and light and has a wide viewing angle range can be obtained.
  • the organic material film is described as being made of a single organic material thin film, but is not limited thereto.
  • the organic material film may be formed by sequentially stacking a plurality of organic thin films, or these organic thin films may be made of different materials.
  • the composite layer may have any number of layers as long as organic material films and inorganic material films are alternately laminated. Furthermore, although not shown, a conversion layer (C CM layer) is formed between the substrate and the composite layer.
  • C CM layer conversion layer
  • the organic EL surface panel is a method of extracting light to the outside through the substrate, which is a so-called “bomission type panel”, but is not limited to this.
  • a so-called top emission type panel may be used in which light is extracted from the opposite side.
  • the top emission type panel includes an organic EL element including an organic functional layer including a light emitting layer that emits light having a wavelength ⁇ , and first and second display electrodes sandwiching the organic functional layer, and the organic EL element. And a substrate to be carried.
  • the organic EL element includes the substrate and an inorganic material. It is sealed with a composite layer made of a film and an organic material film.
  • the composite layer has substantially the same structure as that of the above-described embodiment.
  • the refractive index of the organic material film in the composite layer is smaller than the refractive index of the inorganic material film, and the optical distance L of the organic material film is
  • the composite layer 6 has a refractive index smaller than those of the first and second inorganic material films 3 and 5 and the first inorganic material films 3 and 5, and The case where the organic material film 4 is arranged has been described.
  • the intermediate film 4 disposed between the first and second inorganic material films 3 and 5 may be made of an inorganic material. That is, in the composite layer 6, a film (inorganic material film) 4 made of an inorganic material having a refractive index smaller than that of the inorganic material films 3 and 5 may be arranged between the inorganic material films 3 and 5.
  • the composite layer 6 is configured so that L satisfies the above formula (6). Furthermore, it is more preferable that the composite layer 6 is configured to satisfy the above formula (7).
  • the inorganic material B ⁇ 4 is made of silicon oxide (S i 0 2 ), silicon nitride (S i N x ), silicon nitride oxide (S i ON), aluminum oxide (A l 2 0 3 ), etc.
  • An inorganic material that can be used for Jlii light in the visible light region can be used.
  • the inorganic material film 4 can be formed by a method such as vapor deposition, CVD, sputtering, or IP. A method capable of forming a film with less stress is preferable. Especially in the case of the CVD method, the stress of the film to be formed can be controlled and it is easy to form a thick film. preferable.
  • the film formed by the CVD method has excellent coverage performance, a composite layer 6 having excellent barrier performance can be formed.
  • the film can be formed by a wet-co-firing type forming method such as sol-gel or polysilazane.

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  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un panneau d'affichage électroluminescent organique qui comprend un élément électroluminescent (EL) organique et un substrat sur lequel est monté l'élément électroluminescent organique, l'élément électroluminescent organique comprenant une couche fonctionnelle organique dotée d'une couche luminescente, qui émet une longueur d'onde lumineuse ?, ainsi que des premières et secondes électrodes d'affichage maintenant entre elle la couche fonctionnelle organique. Une couche composite comprenant un film en matière inorganique et un film en matière organique est appliquée entre le substrat et l'élément électroluminescent organique. L'indice de réfraction du film en matière organique est inférieur à celui du film en matière inorganique. La distance optique L du film en matière organique répond à la formule mathématique (1) suivante: [?2/L = FWHM(PL)], PL représentant un spectre de luminescence d'un matériau électroluminescent organique contenu dans la couche luminescente; et FWHM représentant l'épaisseur de demi-absorption du spectre de luminescence .
PCT/JP2006/318469 2005-09-15 2006-09-12 Panneau d'affichage electroluminescent organique Ceased WO2007032526A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005268973 2005-09-15
JP2005-268973 2005-09-15

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WO2007032526A1 true WO2007032526A1 (fr) 2007-03-22

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PCT/JP2006/318469 Ceased WO2007032526A1 (fr) 2005-09-15 2006-09-12 Panneau d'affichage electroluminescent organique

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08250786A (ja) * 1995-01-10 1996-09-27 Hitachi Ltd 多重共振構造を有する発光素子
JPH09180883A (ja) * 1995-10-27 1997-07-11 Toyota Central Res & Dev Lab Inc 微小光共振器型有機電界発光素子
WO2001039554A1 (fr) * 1999-11-22 2001-05-31 Sony Corporation Dispositif d'affichage
JP2002100469A (ja) * 2000-09-25 2002-04-05 Pioneer Electronic Corp 有機エレクトロルミネッセンス表示パネル
JP2004253390A (ja) * 2003-02-18 2004-09-09 Eastman Kodak Co カラー有機発光表示装置
JP2005123012A (ja) * 2003-10-16 2005-05-12 Pioneer Electronic Corp 有機エレクトロルミネセンス表示パネルとその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08250786A (ja) * 1995-01-10 1996-09-27 Hitachi Ltd 多重共振構造を有する発光素子
JPH09180883A (ja) * 1995-10-27 1997-07-11 Toyota Central Res & Dev Lab Inc 微小光共振器型有機電界発光素子
WO2001039554A1 (fr) * 1999-11-22 2001-05-31 Sony Corporation Dispositif d'affichage
JP2002100469A (ja) * 2000-09-25 2002-04-05 Pioneer Electronic Corp 有機エレクトロルミネッセンス表示パネル
JP2004253390A (ja) * 2003-02-18 2004-09-09 Eastman Kodak Co カラー有機発光表示装置
JP2005123012A (ja) * 2003-10-16 2005-05-12 Pioneer Electronic Corp 有機エレクトロルミネセンス表示パネルとその製造方法

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