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Dispersion-type electroluminescent element

An electroluminescent element, a decentralized technology, applied in the direction of electroluminescent light sources, electrical components, electric light sources, etc., can solve the problems of early deterioration of EL element brightness, blackening of the light-emitting surface, etc., and achieve good durability and luminous brightness good effect

Inactive Publication Date: 2008-02-20
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an EL element using phosphor particles with a small particle size has a disadvantage of early deterioration in luminance.
[0005] In addition, in general, as one of the causes of deterioration of EL elements, it is known that the contact interface between phosphor particles and transparent electrodes is deteriorated by heat or oxygen, etc., causing the light-emitting surface to become black.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] In the order of the first layer and the second layer described below, the coating liquids for forming each layer were applied to an alumina electrode (back electrode) having a thickness of 70 μm to form each layer. Next, sputter indium-tin oxide on polyethylene terephthalate (thickness 75 μm) to form a transparent electrode with a thickness of 40 nm, and connect the transparent electrode side (the conductive side) with the aluminum oxide electrode side On the other hand, the transparent electrode was made to be adjacent to the layer containing the phosphor particles of the second layer, and they were pressure-bonded in a nitrogen atmosphere using a hot roll machine at 190°C.

[0116] The amount of additives in each layer shown below is the equivalent mass per 1 square meter of the EL element.

[0117] Each layer was formed by applying a coating solution obtained by adding dimethylformamide to the additives of each layer to adjust the viscosity, and drying at 110° C. for 1...

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PUM

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Abstract

This invention provides a dispersion-type EL element that has excellent luminescence brightness and durability and an improved service life. A dispersion-type EL element, which can realize a larger screen, has excellent luminescence brightness and durability and an improved service life, is also provided. The dispersion-type electroluminescent element comprises a pair of electrodes of a back electrode and a transparent electrode, and at least an insulating layer and a fluorescent substance particle-containing luminescent layer provided between the pair of electrodes. The average size of the fluorescent substance particles is not less than 1 [mu]m and less than 20 [mu]m, and the coefficient of variation of the particle size is not less than 3% and less than 35%. At least one barrier layer comprising at least one material selected from the group consisting of thermoplastic resins, heat curing resins, and UV curing resins is provided between the transparent electrode and the luminescent layer.

Description

technical field [0001] The present invention relates to a high-brightness and long-life dispersion-type EL element having a light-emitting layer on which electroluminescence (EL) powder particles are dispersedly coated. Background technique [0002] The EL phosphor is a voltage-excited phosphor, and there are known a dispersion-type EL and a thin-film-type EL in which phosphor powder is sandwiched between electrodes as a light-emitting element. The general shape of the dispersion-type EL phosphor is a structure formed by dispersing the phosphor powder in a binder with a high dielectric constant and sandwiching it between two electrodes, at least one of which is transparent. An alternating electric field is applied between the electrodes to emit light. The thickness of the light-emitting element made of EL fluorescent powder can be less than a few millimeters. Since it is a surface luminous body, it has many advantages such as less heat generation and high luminous efficienc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/14H05B33/22
CPCC09K11/584H05B33/22H05B33/14C09K11/06
Inventor 白田雅史
Owner FUJIFILM CORP
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