JP2003288984A - Organic el panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL panel having stable reproducibility in luminescence colors. <P>SOLUTION: The organic EL panel is formed by mounting a laminated body having a first electrode, a light emitting layer 20 and a second electrode on a substrate 12. The light emitting layer 20 has a first light emitting part 20B for emitting a first luminescence color, and a second light emitting part 20Y for emitting a second luminescence color. The first electrode has a positive electrode part 14b formed in stripes, and the second electrode has a negative electrode part 16b formed in stripes extended in a direction crossing the positive electrode part 14b. A plurality of pixels 24 made of the positive electrode 14b and the negative electrode 16b facing each other and provided in a matrix form each have the first light emitting part 20B and the second light emitting part 20Y. The second luminescence color is a complementary color of the first luminescence color. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic EL panel in which a laminate having a light emitting layer sandwiched between a first electrode and a second electrode is formed on a substrate.

[0002]

2. Description of the Related Art As shown in FIG.
Is a laminate 3 formed on a glass substrate 2,
This laminated body 3 has a transparent electrode 4, an insulating layer 5, an organic layer 6, and a back electrode 7 made of aluminum (Al). The transparent electrode 4 is made of ITO (Indium Tin Oxide). The organic layer 6 is formed by sequentially forming a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer by a method such as vapor deposition.

The laminated body 3 is covered with a sealing glass 8,
The sealing glass 8 is adhered to the glass substrate 2 with an ultraviolet curable adhesive 9. The transparent electrode 4 has an anode terminal portion 4a and an anode portion 4b, and the back electrode 7 is a cathode terminal portion 7
a and the cathode portion 7b. The organic layer 6 is the anode part 4
b and the cathode part 7b, the organic EL panel 1
Emits light by connecting a power source to the anode terminal portion 4a and the cathode terminal portion 7a. Since the organic EL panel 1 is a self-luminous display element, it has the advantage of not requiring a backlight device as compared with a liquid crystal display element, and has attracted attention in a wide variety of product fields.

[0004]

The emission color of the organic EL panel 1 can be adjusted by the ratio of the guest material added to the emission layer. That is, the light-emitting layer is a host material doped with a guest material. For example, white light emission can be obtained by using a guest material in which a blue dopant agent and a yellow dopant agent are mixed. However, the mixing ratio of the blue dopant agent and the yellow dopant agent is several tens to one, and the amount of the yellow dopant agent is extremely small compared to the blue dopant agent. Therefore, the mixing ratio of the guest materials (blue dopant agent and yellow dopant agent) is It is difficult to make the value constant and the reproducibility of the emission color is low.

The present invention has been made in view of the above problems, and provides an organic EL panel capable of obtaining stable luminescent color reproducibility.

[0006]

In order to solve the above problems, the present invention provides an organic EL device in which a laminate 13 having at least a first electrode 14, a light emitting layer 20 and a second electrode 16 is formed on a substrate 12. In the panel 11, the light emitting layer 20 is
It has a first light emitting portion 20B that emits a first light emitting color and a second light emitting portion 20Y that emits a second light emitting color having a predetermined area ratio with respect to the first light emitting portion.

Further, according to the present invention, the first electrode 14 has an anode part 14b formed in a stripe shape, and the second electrode 16 is formed in a stripe shape in a direction intersecting with the anode part 14b. It also has a cathode part 16b.

Further, according to the present invention, a plurality of pixels 24, which are arranged in a matrix and are formed by the facing portions of the anode portion 14b and the cathode portion 16b, are provided in the first light emitting portion 20B and the second light emitting portion 20Y. Respectively.

Further, according to the present invention, the second luminescent color is a complementary color of the first luminescent color.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a dot matrix type organic EL panel 11 will be described below with reference to the accompanying drawings. 1 to 4 show a first embodiment.

The organic EL panel 11 includes a glass substrate 12
The laminate 13 is formed on the (substrate). Stack 1
3 is composed of a transparent electrode 14 (first electrode), an organic layer 15, and a back electrode 16 (second electrode), which are sequentially laminated on the rear surface of the glass substrate 13. Transparent electrode 14
Is made of ITO (Indium Tin Oxide) in which tin oxide (SnO ₂ ) is doped with indium oxide (In ₂ O ₃ ), and is formed on the glass substrate 12 by a method such as sputtering or ion plating. The transparent electrode 14 has an anode terminal portion 14a and an anode portion 14b, and has a stripe shape.

The organic layer 15 is formed by sequentially stacking a hole injection layer 18, a hole transport layer 19, a light emitting layer 20, an electron transport layer 2 and an electron injection layer 22 by a method such as vapor deposition.
The back electrode 16 is made of aluminum (Al) and is formed by a method such as vapor deposition. The back electrode 16 has a stripe shape in a direction orthogonal to the transparent electrode 15,
It has a cathode terminal portion 16a and a cathode portion 16b. The pixel 24 is located at a position where the anode portion 15b and the cathode portion 18b face each other,
The pixels 24 are provided in a matrix.

Next, the light emitting layer 20 will be described in more detail.
The light emitting layer 20 includes a blue light emitting portion 20B (first light emitting portion),
The yellow light emitting portion 20Y (second light emitting portion) is sequentially deposited. The blue light emitting portion 20B is a mixture of a host material and a blue dopant agent, and the yellow light emitting portion 20Y is
It is a mixture of a host material and a yellow dopant agent.

As shown in FIG. 4, the yellow light emitting portion 20Y has a substantially square shape and is arranged at the upper right portion of each pixel 24. The yellow light emitting portion 20Y may be provided with a slight distance from the blue light emitting portion 20B, or may be provided so as to slightly overlap the blue light emitting portion 20B. The yellow light emitted by the yellow light emitting portion 20Y is a complementary color of the blue light emitted by the blue light emitting portion 20B, and the pixel 24 emits white light.

In this embodiment, a desired emission color is obtained by providing the blue light emitting portion 20B and the yellow light emitting portion 20Y in a predetermined area ratio, and two dopant agents are conventionally mixed. Since there is no light, the reproducibility of the emission color is stable. Although the yellow light emitting portion 20Y of the present embodiment has a substantially square shape, it may have a rectangular shape as in the second embodiment shown in FIG. 5 or a circular shape as in the third embodiment shown in FIG. May be. Further, in the present embodiment, white light emission is obtained by the blue light emitting portion 20B and the yellow light emitting portion 20Y, but various emission colors can be obtained by appropriately selecting the dopant agent and area ratio of each light emitting portion.

Further, the laminate 1 is formed on the organic / organic EL panel 11.
A sealing member such as a sealing glass that covers 3 may be provided. Further, although the dot matrix type organic organic EL panel 11 is used in this embodiment, for example, the segment type organic organic EL panel 11 is used.
It goes without saying that the present invention can also be applied to the L panel.

[0017]

According to the present invention, in an organic EL panel in which a laminate having at least a first electrode, a light emitting layer and a second electrode is formed on a substrate, the light emitting layer emits a first emission color. It has one light emitting portion and a second light emitting portion which emits a second light emitting color having a predetermined area ratio to the first light emitting portion, and stable light emitting color reproducibility is obtained. .

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a front view showing the embodiment.

FIG. 3 is an enlarged cross-sectional view of a pixel showing the embodiment.

FIG. 4 is an enlarged front view of a pixel showing the embodiment.

FIG. 5 is an enlarged front view of a pixel showing a second embodiment of the present invention.

FIG. 6 is an enlarged front view of a pixel showing a third embodiment of the present invention.

FIG. 7 is a sectional view showing a conventional example.

[Explanation of symbols]

11 Organic EL panel 13 laminate 14 Transparent electrode (first electrode) 14b Anode part 16 Back electrode (second electrode) 16b cathode part 16b 20 light emitting layer 20B Blue light emitting part (first light emitting part) 20Y Yellow light emitting part (second light emitting part) 24 pixels

Claims (4)

[Claims] 1. An organic EL panel in which a laminated body having at least a first electrode, a light emitting layer, and a second electrode is formed on a substrate, wherein the light emitting layer emits a first light emission color. When,
A second light emitting portion which emits a second light emission color and has a predetermined area ratio with respect to the first light emitting portion. 2. The first electrode has an anode part formed in a stripe shape, and the second electrode has a cathode part formed in a stripe shape in a direction intersecting with the anode part. The organic EL panel according to claim 1. 3. A plurality of pixels, which are arranged in a matrix and are formed by facing portions of the anode portion and the cathode portion, have the first light emitting portion and the second light emitting portion, respectively. Item 2. The organic EL panel according to item 2. 4. The organic EL panel according to claim 1, wherein the second emission color is a complementary color of the first emission color.