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Multiple wavelength light emitting device, electronic apparatus, and interference mirror

A light-emitting device and wavelength spectrum technology, applied in lighting devices, electroluminescent light sources, circuits, etc., can solve the problems of difficult, expensive, and difficult to design light-emitting devices

Inactive Publication Date: 2005-11-23
SEIKO EPSON CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But the problem with the light-emitting device with the structure disclosed in the above-mentioned publication is that it is very difficult to design a light-emitting device optimized for all multiple wavelengths
Ordinary light-emitting devices are difficult to achieve this balance adjustment
[0007] It has been said that it is still very difficult to make a multi-layer dielectric film structure that is different for each pixel (light-emitting area) in actual production practice, so this method is difficult to realize in industry, so it is an expensive process

Method used

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  • Multiple wavelength light emitting device, electronic apparatus, and interference mirror
  • Multiple wavelength light emitting device, electronic apparatus, and interference mirror
  • Multiple wavelength light emitting device, electronic apparatus, and interference mirror

Examples

Experimental program
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Effect test

Embodiment approach 1

[0063] The first embodiment of the present invention relates to a basic structure in which light of three basic colors necessary for color display can be emitted and gap adjustment is performed with a positive electrode. exist figure 1 The layer structure of the multi-wavelength light-emitting device in the first embodiment is shown in , which includes a substrate 1 , a semi-reflective layer 2 , a positive electrode 3 , a light-emitting layer 4 and a negative electrode 5 .

[0064] The substrate 1 used as a base during fabrication is made of a material having high transmittance and specific mechanical strength, and the material can withstand heat treatment during fabrication. Such materials as glass, quartz or resin are suitable for the substrate.

[0065] The set of semi-reflective layers 2 consists of a stack of semi-reflective layers 2R, 2G and 2B optimized for light of a specific wavelength. The semi-reflective layer 2R is optimized to interfere with the wavelength (aro...

Embodiment approach 2

[0092] A second embodiment of the present invention relates to a structure in which a hole transport layer is provided in the organic EL element of the first embodiment. exist image 3 The layer structure of the multi-wavelength light-emitting device of the second embodiment is shown in . Such as image 3 As shown, this multi-wavelength light-emitting device includes a substrate 1 , a semi-reflective layer group 2 , a positive electrode 3 , a hole transport layer 6 , a light-emitting layer 4 and a negative electrode 5 .

[0093] The hole transport layer 6 is also called a hole injection layer, and is made of an organic or inorganic material having a hole injection function or an electron blocking function. For example, materials disclosed in Japanese Patent Laid-Open No. 163967 / 1988 or Japanese Patent Laid-Open No. 248276 / 1996 can be used. More specifically, usable substances include triazole derivatives, oxadiazole derivatives, polyaryl alcane derivatives, antipyridine der...

Embodiment approach 3

[0097] The third embodiment relates to a structure in which an electron transport layer is provided in the organic EL element of the second embodiment. exist Figure 4 The layer structure of the multi-wavelength light-emitting device of the third embodiment is shown in . Such as Figure 4 As shown, this multi-wavelength light-emitting device includes a substrate 1 , a semi-reflective layer group 2 , a positive electrode 3 , a hole transport layer 6 , a light-emitting layer 4 , an electron transport layer 7 and a negative electrode 5 .

[0098] The electron transport layer is also called the electron injection layer, which has the function of extracting injected electrons from the negative electrode and effectively transporting them to the light emitting layer. For example, materials disclosed in Japanese Patent Laid-Open No. 163967 / 1988, Japanese Patent Laid-Open No. 248276 / 1996, or Japanese Patent Laid-Open No. 194393 can be used. More specifically, materials that can be u...

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Abstract

A light-emitting device, characterized by comprising: a plurality of first light-emitting elements, each of which emits first light having a first wavelength spectrum; a plurality of second light-emitting elements, each of which a light emitting element emitting second light having a second wavelength spectrum different from the first wavelength spectrum; and a semi-reflective layer group, third light output from the light emitting device, from the light emitting device output fourth light, the third light has a third wavelength spectrum, the third wavelength spectrum is obtained by sharpening the first wavelength spectrum by the semi-reflective layer group, and the fourth light has A fourth wavelength spectrum, the fourth wavelength spectrum is obtained by sharpening the second wavelength spectrum by the semi-reflective layer group.

Description

[0001] This application is a divisional application of the original application with the application number 00811102.2 and the filing date of June 2, 2000. The international application number of the original application is PCT / GB 00 / 02143 and the earliest priority date is June 2, 1999. technical field [0002] The present invention relates to improvements in light-emitting devices capable of emitting multi-colored light suitable for use eg in organic electroluminescent (=EL) devices. Background technique [0003] A technique of combining a reflective layer with a multilayer dielectric film and reflecting light of a specific wavelength is known, in which layers with different refractive indices are stacked alternately. The use of very small resonant structures based on these multilayer dielectric films to emit multiple light colors is disclosed in Shingaku Gihou, OME 94-79 (March 1995), pp. 7-12. According to this document, by adjusting the positions of the light-emitting la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/26G02B5/28H01L27/32H01L51/50H01L51/52H05B33/12H05B33/24H05B33/26H05B44/00
CPCH01L51/5036H01L51/5265H01L27/3281H01L27/3211G02B5/285H10K59/35H10K50/125H10K59/876H10K50/856H05B33/24H10K50/852H10K59/17
Inventor 下田达也小山智子金子丈夫J·H·巴勒斯
Owner SEIKO EPSON CORP