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Method for manufacturing inorganic el blue-light emitting body

A manufacturing method and technology of luminous bodies, applied in the direction of luminescent materials, electroluminescent light sources, chemical instruments and methods, etc., can solve the problems of not displaying luminous light, unable to use blue luminous bodies with inorganic EL elements, etc., to achieve stable display, The effect of superior reproducibility

Inactive Publication Date: 2009-08-26
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, a luminescent body (ZnS:Ag) obtained by adding silver (Ag) exhibits strong luminescence when activated by ultraviolet rays or electron beams, but hardly exhibits luminescence when activated by an electric field. It cannot be used as a blue emitter for inorganic EL elements at this stage

Method used

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  • Method for manufacturing inorganic el blue-light emitting body
  • Method for manufacturing inorganic el blue-light emitting body
  • Method for manufacturing inorganic el blue-light emitting body

Examples

Experimental program
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Embodiment approach 1

[0028] In this embodiment mode, the synthesis method of the blue light emitting body for inorganic EL which is one aspect of this invention is demonstrated.

[0029] In addition, the blue light emitter for inorganic EL shown in this embodiment mode has copper sulfide (Cu X S) is a sulfide luminescent body, and a solid-phase method can be used as its synthesis method.

[0030] In the case of using the solid-phase method, such as Figure 1A As shown in the flow chart, by weighing and mixing the sulfide emitters, additives, and copper compounds used as raw materials, and then at a temperature above 600°C and below 1000°C, more preferably at a temperature above 700°C and below 800°C. Roasting, washing, can form copper sulfide (Cu X S) Sulfide emitter.

[0031] The sulfide emitter used as starting material consists of a matrix material, an activator, and a coactivator. In addition, the matrix material is a sulfide, for example, zinc sulfide (ZnS), cadmium sulfide (CdS), calcium ...

Embodiment approach 2

[0042] In this embodiment, use Figures 2A to 2C A dispersion-type inorganic EL element formed using the blue light emitter for inorganic EL which is one aspect of the present invention will be described.

[0043] The inorganic EL element shown in this embodiment has an element structure in which a first electrode 202 , an inorganic EL layer 203 , and a second electrode 204 are sequentially stacked on a substrate 201 . In addition, a dielectric layer serving as a dielectric may be provided between the first electrode 202 and the inorganic EL layer 203 and / or between the inorganic EL layer 203 and the second electrode 204 .

[0044] Light emission can be obtained from the inorganic EL layer 203 by applying a desired voltage between the first electrode 202 and the second electrode 204 . In addition, the inorganic EL element shown here operates by AC driving by applying an AC voltage between two electrodes using the AC power supply 205 .

[0045] Figures 2A to 2C The illustra...

Embodiment approach 3

[0059] In Embodiment 3, as a light-emitting device formed using an inorganic EL element according to one embodiment of the present invention, Figures 3A to 3C with Figure 4 A passive matrix type light emitting device will be described.

[0060] A passive matrix type (also referred to as a simple matrix type) light emitting device has a structure in which a plurality of anodes arranged in a stripe shape (belt shape) and a plurality of cathodes arranged in a stripe shape are arranged to be orthogonal to each other, and the crossing portion sandwiches Has a luminescent layer. As a result, the pixel at the intersection of the selected (voltage applied) anode and the selected cathode emits light.

[0061] Figure 3A A plan view showing the pixel portion before sealing, Figure 3B presumed to be Figure 3A The cross-sectional view cut by the dotted line A-A' in, Figure 3C presumed to be Figure 3A The cross-sectional view cut by the dotted line B-B' in .

[0062] An insul...

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Abstract

An object is to reduce effects of emission luminance change of the a light emitting body which exhibits blue light emission (a blue-light emitting body) by electric field excitation, that is, a blue-light emitting body which is applicable to an inorganic EL element on the chromaticity coordinates of the light it emits. Further, another object is to improve the repeatability of images displayed on a light emitting device including the inorganic EL element and to realize stable display with the light emitting device which is hardly affected by luminance change. In a method for manufacturing an inorganic EL blue-light emitting body, a sulfide light emitting body, an additive, and a copper compound are mixed and the obtained mixture is baked at 600 DEG C. or more and 1000 DEG C. or less, whereby the sulfide light emitting body can include copper sulfide (CuxS, wherein x is preferably 0.5 to 2.5) as a part of the sulfide light emitting body.

Description

technical field [0001] The invention relates to a manufacturing method of a blue luminous body for inorganic EL. Background technique [0002] For a long time, the application of electroluminescence (Electro Luminescence) to surface light sources (backlights) or image display devices (displays) has continued to develop, many of which are studies on the structure of EL materials or EL elements. [0003] EL elements can be broadly classified into inorganic EL elements and organic EL elements, among which EL elements formed mainly using organic EL materials and driven by direct current are organic EL elements, and EL elements formed mainly using inorganic EL materials and driven by alternating current are Inorganic EL elements. [0004] As an inorganic El material used in an inorganic EL element, an emitter that exhibits blue light emission contains BaAl 2 S 4 The illuminants are well known. This is the addition of europium (Eu) used as a luminescent center to the 2 S 4 T...

Claims

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Application Information

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IPC IPC(8): H05B33/10C09K11/08C09K11/56C09K11/58
CPCC09K11/612H05B33/145
Inventor 坂田淳一郎松原里枝
Owner SEMICON ENERGY LAB CO LTD