Composite transparent fluorescent ceramic chip and preparing method for white LEDs

A fluorescent ceramic, LED chip technology, applied in electrical components, circuits, semiconductor devices, etc., can solve the problems affecting the luminous effect and service life of the device, high color temperature, not soft, etc., to improve the luminous efficiency and service life, good luminescence effect, effect of high color rendering index

Inactive Publication Date: 2017-05-17
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Poor uniform dispersion of phosphor particles in organic materials and light scattering on the surface affect the optical uniformity and luminous efficiency of white LED devices;
[0005] (2) The thermal stability of organic materials is poor, which leads to the degradation and aging of organic materials, which affects the luminous effect and service life of devices;
[0006] (3) The lack of fluorescent pink components cannot achieve white light with low color temperature and high color rendering index, resulting in high color temperature and not soft;
[0007] (4) The lack of independent property rights of commercial phosphors. At present, most of the commercial phosphors on the market come from Europe, America, Japan and other countries, which greatly limits the research and development and production of LED devices in my country.
However, the materials obtained by this method have problems such as color rendering index and color temperature difference.

Method used

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  • Composite transparent fluorescent ceramic chip and preparing method for white LEDs
  • Composite transparent fluorescent ceramic chip and preparing method for white LEDs
  • Composite transparent fluorescent ceramic chip and preparing method for white LEDs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the thickness of the composite transparent fluorescent ceramic sheet is 0.5 mm, and its surface is as figure 1 As shown, 4*4 small ceramic units are closely connected in cross-section to form an overall structure. Each small ceramic unit has the same structure and a square structure, forming a 4*4 square array structure as a whole.

[0037] In this embodiment, the excitation light source adopts a blue LED chip. When the excitation light source independently excites each small ceramic unit, it emits two colors of light, red light and yellow light, that is, each small ceramic unit is a light-emitting pixel point, each light-emitting Pixels can be divided into red light pixels and yellow light pixels according to the color of light emitted after excitation, such as figure 1 The white squares in the figure represent yellow light pixels, and the black squares represent red light pixels. When the composite transparent fluorescent ceramic sheet is excited ...

Embodiment 2

[0048] In this embodiment, the structure of the composite transparent fluorescent ceramic sheet is basically the same as that of the composite transparent fluorescent ceramic sheet in Example 1, except that the red light pixels are all composed of YAG:Pr 3+ Composed of materials, the yellow light pixels are all made of YAG:Ce 3+ Material composition.

[0049] The preparation method of the composite transparent fluorescent ceramic sheet is as follows:

[0050] In YAG:Pr 3+ It is a ceramic powder that glows red after excitation, using deionized water as a solvent, sodium polyacrylate (PAAS) as a dispersant, methyl cellulose (MC) as a binder, and glycerol as a plasticizer , adding 0.6% of PAAS to obtain a stable dispersion of YAG:Pr 3+ Powder suspension, after ball milling for 8 hours, add 1.5% MC and 1.2% glycerol, and continue ball milling for 20 hours to obtain red light ceramic slurry;

[0051] With YAG:Ce 3+ It is the ceramic powder of the pixels that emit yellow light ...

Embodiment 3

[0056] In this embodiment, the structure of the composite transparent fluorescent ceramic sheet is basically the same as that of the composite transparent fluorescent ceramic sheet in Example 1, the difference is that the red light pixels are all composed of YAG:Eu 3+ Composed of materials, the yellow light pixels are all made of YAG:Ce 3+ Material composition.

[0057] The preparation method of the composite transparent fluorescent ceramic sheet is basically the same as the preparation method in Example 1, except that the red light pixels are all composed of YAG:Eu 3+ Composed of materials, the yellow light pixels are all made of YAG:Ce 3+ Material composition.

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Abstract

The invention provides a composite transparent fluorescent ceramic chip and preparing method for white LEDs, the composite transparent fluorescent ceramic chip is the integral structure of two or more small ceramic units connected in the cross section, the small ceramic unit is a light pixel, the light color of the each lighting pixel is more than two, after being excited by the LED chip, the composite transparent fluorescent ceramic chip emits white light. Compared with the existing technology, the different lighting pixel points are compound on the same ceramic chip according to the principle that the three base colors of red light, blue light and green light are mixed into white light, the problem of uneven dispersion of phosphor particles in organic materials, the scattering of surface light and the loss of red components, and the like are overcome, the technical scheme has the advantages of high conversation efficiency, high color index, long life, good heat stability and adjustable color temperature.

Description

technical field [0001] The invention belongs to the technical field of LED lighting, and relates to a composite transparent fluorescent ceramic sheet for white LEDs and a preparation method thereof. Background technique [0002] With the progress of light emitting diode (Light Emitting Diode, referred to as LED) technology, white LED has gradually entered the field of general lighting from the application field of special light source. With its high brightness, high color rendering index, energy saving and environmental protection, fast response, long service life, small size, high reliability and other advantages, white LED has become the "fourth generation of green lighting" after incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps. light source". [0003] Currently commercialized white light LEDs are mainly prepared by using a light conversion technology that converts blue light (or violet light) into white light. This method is mainly to dispers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/00H01L33/48H01L33/50
CPCH01L33/504H01L33/005H01L33/48H01L2933/0041
Inventor 张继云罗朝华蒋俊江浩川
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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