Light-emitting device and display device

A technology for light-emitting devices and display devices, applied in lighting devices, luminescent materials, electroluminescent light sources, etc., can solve problems such as electrode damage, achieve stable productivity, reduce production costs, and suppress dielectric breakdown

Inactive Publication Date: 2005-11-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrodes placed on top of the phosphor layer may even be damaged

Method used

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  • Light-emitting device and display device
  • Light-emitting device and display device
  • Light-emitting device and display device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0026] figure 1 It is a cross-sectional view perpendicular to the light emitting surface of the electroluminescence (EL) device 10 according to the first embodiment of the present invention. The EL device 10 is laminated on the back substrate 11 in sequence: the back electrode 12, the insulating layer 13 made of a dielectric material with a dielectric constant of 300 or more, and the inorganic phosphor powder dispersed in an organic binder The dispersed phosphor layer 14, the transparent front electrode 15, and the cover layer 16. The AC power source 17 arranged between the front electrode 15 and the back electrode 12 supplies an alternating voltage to cause the dispersion type phosphor layer 14 to emit. The light 30 emitted from the phosphor layer 14 emits light in all directions, and is obtained through the transparent front electrode side in the EL device 10. Because the insulating layer 13 is an annealed dielectric material, the surface roughness of the insulating layer 13 i...

no. 2 approach

[0051] Below, reference figure 2 The display device according to the second embodiment of the present invention is described. figure 2 Shown is a schematic plan view of a passive matrix display device 20 having a transparent electrode 21 and a counter electrode 22 perpendicular to each other. This display device 20 has a plurality of EL devices as described in the above-mentioned first embodiment arranged in a plane. The plurality of transparent electrodes 21 are parallel to the first direction and parallel to the surface of the EL array, and the plurality of opposite electrodes 22 are parallel to the surface of the EL array and parallel to the second direction perpendicular to the first direction. In this display device 20, the reverse electrode 22 is connected to the back electrode of each EL device, and the transparent electrode 21 is connected to the front electrode of each EL device. An external AC voltage is applied between the pair of transparent electrodes 21 and the cou...

Embodiment 1

[0056] The EL device according to this embodiment is basically the same as the above-mentioned basis figure 1 The EL device of the first embodiment shown is the same, except that it has no cover layer. The method of preparing this EL device is described below:

[0057](a) A 0.635 mm thick alumina substrate is used for the back substrate.

[0058] (b) An Ag-Pd paste of about 85% Ag and about 15% Pd was used for the back electrode, and a stripe pattern of 2 mm wide lines with a pitch of 3 mm was screen printed on the back substrate. The paste is then dried and annealed to obtain an Ag-Pd alloy back electrode on the back substrate.

[0059] (c) BaTiO 3 The paste is used as a precursor of the dielectric material of the insulating layer, and this paste is screen printed on the back electrode. Then the paste was annealed at 950°C in an air atmosphere to form BaTiO on the back electrode 3 Insulation. The film thickness of the resulting insulating layer was 35 μm, and the center line ave...

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Abstract

The EL device has a first electrode formed over a substrate, an insulating layer made from a dielectric material having a dielectric constant of 300 or greater formed over the first electrode, a light emitting layer formed over the insulating layer having a film thickness in a range of 10 mum to 100 mum, and a second electrode formed over the light emitting layer.

Description

Technical field [0001] The present invention relates to an electroluminescent device, and more specifically, to an AC-driven electroluminescent device. Background technique [0002] As a light, thin, surface emitting device, electroluminescent devices (hereinafter referred to as "EL devices") have become a subject of great interest. EL devices generally include organic EL devices and inorganic EL devices. When a DC voltage is applied to an organic phosphor to recombine electrons and holes to release one photon, the organic EL device emits light. When AC voltage is applied to the inorganic phosphor, 6 When the electrons accelerated by the high electric field of V / cm collide with the emission center and excite the inorganic phosphor, and make the inorganic phosphor emit during the relaxation process, the inorganic EL device emits light. [0003] The inorganic EL device also includes: a dispersion type EL device having inorganic phosphor powder dispersed in an organic polymer binder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/22C09K11/57C09K11/58H05B33/00H05B33/10H05B33/12H05B33/14
CPCC09K11/584C09K11/574H05B33/14
Inventor 青山俊之小野雅行那须昌吾小田桐优
Owner PANASONIC CORP
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