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Display apparatus

A display device and organic technology, applied in the directions of organic semiconductor devices, electric solid-state devices, semiconductor devices, etc., can solve the problem of driving voltage increase, and achieve the effect of reducing driving voltage and increasing luminous efficiency

Active Publication Date: 2013-05-08
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the display device disclosed in Japanese Patent Laid-Open No. 2008-288201 has the possibility that the driving voltage becomes high depending on the constituent materials of the hole injection layer, light emitting layer, and auxiliary layer

Method used

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Embodiment 1

[0063] preparation figure 2 A display device of the configuration shown in . First, A1 (film thickness of 100 nm) / IZO (film thickness of 10 nm) is laminated on the glass substrate 4 to form a film, and then patterned using photolithography, thereby forming each color organic EL element of each color. Anode 5. Next, the surface of the anode 5 is washed by UV ozone treatment. Then, connect the substrate and material to the vacuum deposition equipment, and then exhaust to 1×10 -4 pa.

[0064] Next, a hole transport material represented by the following structural formula was formed into a film with a film thickness of 25 nm to thereby form hole transport layer 6 .

[0065]

[0066] Next, a blue light emitting layer 7B is formed using a metal mask in a region corresponding to the anode 5 of the blue light emitting organic EL element 3B on the hole transport layer 6 . The blue light emitting layer 7B was obtained by forming a co-deposited film of the blue light emitting do...

Embodiment 2

[0078] By forming a red light-emitting dopant (4 volume %) represented by the following structural formula RD9, a material (15 volume %) represented by the following structural formula OT4, and a light-emitting layer host material represented by the following structural formula RH4 with a film thickness of 25 nm co-deposited film to form the red light emitting layer 7R. A display device was produced in the same manner as in Example 1 except for the red light emitting layer 7R.

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Abstract

A display apparatus with organic EL elements each having an optical-interference structure includes; a blue-light emitting layer that contains a host material and a light emitting material, where LUMO of a hole-transporting layer is smaller than that of the host material and HOMO of the host material is larger than that of the hole-transporting layer by 0.5 eV or lower; and a film-thickness adjustment layer that is disposed between a light emitting layer and the hole-transporting layer of at least one of a red-light emitting EL element and a green-light emitting EL element, where the hole-mobility of the adjustment layer is higher than the carrier-mobility of the light emitting layer of the EL element having the adjustment layer, and HOMO of the adjustment layer is not higher than that of the hole-transporting layer and not lower than that of the light emitting material contained in the light emitting layer thereof.

Description

technical field [0001] The present invention relates to a full-color display device having three-color organic EL (electroluminescent) elements that emit red, green, and blue light. Background technique [0002] As a technique for improving the luminous efficiency of a display device using three-color organic EL elements that emit red light (R), green light (G) and blue light (B), Japanese Patent Laid-Open No. 2000-323277 discloses that for each A technique for changing the film thickness of functional layers other than the light-emitting layer of an organic EL element in terms of emission color. This is a technique of increasing luminous efficiency through an optical interference structure that enhances the peak wavelength of the emission spectrum for each emission color. [0003] Furthermore, Japanese Patent Laid-Open No. 2008-288201 discloses an organic EL element that has achieved high efficiency and long life by: between the light-emitting layer and the hole-injection ...

Claims

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Application Information

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IPC IPC(8): H01L27/32H01L51/50H01L51/52H01L51/54
CPCH01L51/50H01L51/006H01L27/32H01L27/3211H01L51/5265H01L51/52H01L2251/558H01L51/5218H01L51/5064H10K59/35H10K85/633H10K50/156H10K2102/351H10K59/80518H10K59/876H10K50/852H10K50/818
Inventor 石津谷幸司
Owner CANON KK