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Organic electroluminescence display device

A technology of electroluminescence display and display device, which is applied in the direction of circuits, electrical components, electric solid-state devices, etc., and can solve the problems of not recording stacked components, etc.

Inactive Publication Date: 2014-12-17
JAPAN DISPLAY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the documents describe a multilayer device that generates white light by mixing lights of different colors.

Method used

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  • Organic electroluminescence display device
  • Organic electroluminescence display device
  • Organic electroluminescence display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] For testing, make respectively figure 2 The first light-emitting unit 44 and the second light-emitting unit 56 are shown, and an element in which these units are sandwiched by an anode and a cathode, respectively, is prepared. The first light emitting unit 44 and the second light emitting unit 56 have a first electron injection layer 54 and a second electron injection layer 68 respectively, and the first electron injection layer 54 and the second electron injection layer 68 each contain lithium. Therefore, the tendency of characteristic changes when the lithium concentrations contained in the first electron injection layer 54 and the second electron injection layer 68 were respectively changed was investigated.

[0046] image 3 A is a graph showing changes in driving voltage when the lithium concentration of the first electron injection layer 54 is changed in the single element of the first light emitting unit 44 . image 3 B is a graph showing changes in luminous e...

Embodiment 2

[0054] In Example 1, red and green light-emitting units are formed as the first light-emitting unit 44 , and blue light-emitting units are formed as the second light-emitting unit 56 . On the other hand, in Example 2, in figure 2 Here, a blue light emitting unit is formed as the first light emitting unit 44 , and a yellow light emitting unit is formed as the second light emitting unit 56 .

[0055] The first light emitting layer 50 is a blue light emitting layer, the second light emitting layer 64 is a yellow light emitting layer, and white light is obtained from blue light and yellow light.

[0056] As shown in the present embodiment, when a plurality of luminous colors are stacked in the thickness direction, the viewing angle dependence of light emission at a position closer to the reflective layer 28 is small, and the viewing angle dependence becomes smaller at a position farther away from the reflective layer 28. Big. Therefore, it is desirable to arrange a color in whi...

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Abstract

An organic electroluminescence display device includes a first light-emitting unit (44) and a second light-emitting unit (56) that are stacked between a cathode (36) and an anode (30). The first light-emitting unit (44) includes a first electron injection layer (54) and a first light-emitting layer (50) that are stacked. The first electron injection layer (54) is arranged closer to the cathode side than the first light-emitting layer (50) is. The second light-emitting unit (56) includes a second electron injection layer (68) and a second light-emitting layer (64) that are stacked. The second electron injection layer (68) is arranged closer to the cathode side than the second light-emitting layer (64) is. Each of the first electron injection layer (54) and the second electron injection layer (68) includes a compound containing lithium. The number of particles of lithium is from 0.1 mmol / cm 3 to 0.86 mmol / cm 3 .

Description

technical field [0001] The invention relates to an organic electroluminescent display device. Background technique [0002] Among the organic electroluminescent display devices, a device is known that realizes color display using a white light source and a color filter. For example, white light is produced by laminating light-emitting layers that emit light of different colors to mix the colors of the light. [0003] In addition, there is known a technique in which the electron injection layer contains lithium in order to efficiently inject electrons into the light emitting layer. Such a technique is described in Patent Document 1 and Patent Document 2, for example. [0004] According to Patent Document 1, the film thickness of the electron injection layer is changed for each color, and the thinner the film thickness of the electron injection layer is, the higher the metal concentration in the electron injection layer is, thereby improving the optical efficiency. extracti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54H01L27/32
CPCH10K59/30H10K85/324H10K50/171H10K50/00H10K50/11H10K50/131
Inventor 丰田裕训伊藤雅人佐藤敏浩
Owner JAPAN DISPLAY INC