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Color emission device

A light-emitting device and color technology, applied in the direction of lighting devices, electroluminescent light sources, light sources, etc., can solve the problems of the color stability of the color light-emitting device, the low luminous efficiency of the color light-emitting device, and the deterioration of red conversion components, etc. Effects of balanced degradation, high reproducibility, and brightness improvement

Inactive Publication Date: 2008-11-05
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to achieve high conversion efficiency, it has to be a material system that is unstable to the environment, and to ensure high reliability, the conversion efficiency has to be reduced
[0021] In addition, the deterioration of the red conversion member affects the color stability of the entire color light-emitting device
[0022] In order to fully realize the color reproducibility of the color light-emitting device, a color filter is used to remove unnecessary luminescent components that affect the color purity. This method is limited due to the luminous efficiency of the organic EL element and the conversion efficiency of the color conversion member. When color filters are used to remove unnecessary light in order to improve color purity, the luminous efficiency as a color light-emitting device has to be extremely low.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0184] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0185] figure 1 It is a schematic diagram of a color light-emitting device according to an embodiment of the present invention. The symbols in the figure represent: 100-color light-emitting device, 200-emission component (blue component) (B) with a peak in the blue region and a component with a peak outside the blue region (such as 500-600nm) (θ ) light organic EL element, 300-color conversion member containing fluorescent pigment, 400-color filter. in addition. 120 represents a blue pixel, 140 represents a green pixel, and 160 represents a red pixel.

[0186] The color conversion member 300 includes a green conversion member 340 that receives light emitted by the organic EL element, absorbs the blue component (luminescent component with a wavelength of 400-500 nm) and emits green component (500-600 nm) fluorescence, and receives light emitted by the organic EL eleme...

Embodiment approach 2

[0198] [Embodiment 2] Simulation

[0199] Furthermore, by simulating figure 1 The color light-emitting device shown has a white balance (balance of red, green, and blue light emission intensities in white display) of an organic EL element having an emission spectrum with peaks in the blue region and 500 to 600 nm.

[0200] (simulation method)

[0201] The mock method used here is not figure 1 The shown color light-emitting device is actually measured, but the method of obtaining the light emission spectrum extracted from the color filter is used, which is a method invented by the inventors of the present invention. Details are described in Japanese Patent Application No. 2000-360187.

[0202] According to this method, the emission spectrum WL(λ) of the light extracted from the color filter is obtained by the following formula.

[0203] WL(λ)={w(λ)·l0 -Abs(λ) +lu(λ)·F / F 0} T CF (λ)

[0204] F / F 0 ={∫λ·w(λ)·EX(λ)dλ} / {∫λ·el(λ)·EX(λ)dλ}

[0205] In the formula, F 0 The ...

Embodiment approach 3

[0248] Figure 5 is a conceptual diagram schematically showing a color light-emitting device according to another embodiment of the present invention. The symbols in this figure represent respectively: 40-color light-emitting device, 50-light-emitting element, 62-blue conversion component, 64-green conversion component, 66-red conversion component.

[0249] The light emitting element 50 emits light of a blue component and yellow to red components at a set peak intensity ratio.

[0250] The blue conversion member 62 emits blue component light after receiving the light emitted by the light emitting element 50, the green conversion member 64 emits green component light after receiving the light emitted by the light emitting element 50, and the red conversion member 66 receives the light emitted by the light emitting element 50. After the light, it emits light with a red component.

[0251] Each color conversion member is composed of a color filter that absorbs specific light in...

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Abstract

An organic EL element (200) emits light containing a blue component (B) and a component ([theta]) with a peak in 500 to 600nm. A red converting member (360) has an excitation spectrum with a peak in 500 to 600nm. The red converting member receives light from the organic EL element (200) and converts the blue component (B) to a red component (R). At this time, the luminance of the red component (R) is enhanced since the member (360) is strongly excited by the component (0). As a result, the white balance of three colors is improved. Therefore a color emission device (100) can be provided where the intensity of red light is enhanced.

Description

[0001] This application is a divisional application with an international filing date of March 7, 2003, an international application number of PCT / JP03 / 02708, and an invention title of "Color Light-Emitting Device". technical field [0002] The present invention relates to a color light-emitting device, and more particularly to a color light-emitting device using an organic electroluminescence element (hereinafter referred to as an organic EL element) suitable for a color display. technical background [0003] In order to use light-emitting elements such as organic EL elements to produce color light-emitting devices such as televisions, or color display elements for monitors such as computers and mobile phones, it is necessary to form pixels that emit light in three primary colors of blue, green, and red. There are generally the following three methods as the production method, and each has the following problems. [0004] A. Three-color separation coating method [0005] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/12H05B33/22
Inventor 熊均荣田畅细川地潮福冈贤一
Owner IDEMITSU KOSAN CO LTD