Fluorescent ceramic material, preparation method thereof and low-color-temperature white light LED

A fluorescent ceramic, white light technology, applied in luminescent materials, chemical instruments and methods, sustainable architecture, etc., can solve the problems of uneven light emission color, reduced light efficiency, aging of phosphors, etc., and achieve excellent mechanical and mechanical properties, The effect of improving the color rendering index and prolonging the life of the device

Inactive Publication Date: 2018-05-11
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

However, this packaging method has some problems in actual use: First, the heat dissipation performance of the organic packaging material is poor, and the temperature of the chip will be higher than 150°C when the chip is lit for a long time. Efficiency reduction and color drift greatly reduce the service life of white LEDs; secondly, due to the poor heat dissipation performance of the packaging material, the phosphor powder in the packaging material is always in a high temperature environment, resulting in aging of the phosphor powder, causing temperature quenching, and also causing light Efficiency reduction and color drift; moreover, the dispersion of phosphor powder in the packaging material is uneven, especially in mass production, phosphor powder is unevenly dispersed in epoxy resin and silica gel due to precipitation, resulting in uneven light source color
However, the white light LED prepared by the orange phosphor is difficult to avoid the above problems

Method used

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  • Fluorescent ceramic material, preparation method thereof and low-color-temperature white light LED
  • Fluorescent ceramic material, preparation method thereof and low-color-temperature white light LED
  • Fluorescent ceramic material, preparation method thereof and low-color-temperature white light LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Fluorescent ceramic sheet (Lu 1.99 Ce 0.01 Ca)(Mg 2 Si 3 )O 12 The preparation method is as follows:

[0030] (1) Weigh Lu by stoichiometric ratio 2 o 3 : 3.9594g, CeO 2 : 0.0172g, CaCO 3 : 1.0087g, MgO: 0.8061g, SiO 2 : 1.8025g; Add agate balls to the grinding tank, and use absolute ethanol as the grinding medium to grind and mix until the average particle size of the powder is less than 1 μm;

[0031] (2) The obtained slurry is dried and sieved, and the sieved powder is kept at 1000°C in the air for 2 hours to remove the organic matter in the powder, and the CaCO 3 Fully decompose; after sieving the obtained powder, apply a pressure of 10Mpa equiaxially and unidirectionally to keep it for 2min, dry press molding, press it into a green body in a cold isostatic pressing equipment, the pressure is 200MPa, and the holding time is 2min;

[0032] (3) The obtained ceramic green body is sintered in a vacuum furnace at a heating rate of 1°C / min, kept at 1200°C for 4 ...

Embodiment 2

[0038] Fluorescent ceramic sheet (Lu 1.99 Ce 0.01 Ca 0.9 Ba 0.1 )(Mg 2 Si 3 )O 12 The preparation method is as follows:

[0039] (1) Weigh Lu by stoichiometric ratio 2 o 3 : 3.9594g, CeO 2 : 0.0172g, CaCO 3 : 0.9074g, BaCO 3 : 0.0164g, MgO: 0.8061g, SiO 2 : 1.8025g. Use a grinding tank to add agate balls, and use absolute ethanol as the grinding medium for grinding and mixing until the average particle size of the powder is less than 1 μm;

[0040] (2) The obtained slurry is dried and sieved, and the sieved powder is kept at 1000°C in the air for 2 hours to remove the organic matter in the powder, and the CaCO 3 Fully decompose; after sieving the obtained powder, apply a pressure of 10Mpa equiaxially and unidirectionally to keep it for 2min, dry press molding, press it into a green body in a cold isostatic pressing equipment, the pressure is 200MPa, and the holding time is 2min;

[0041] (3) The obtained ceramic green body was sintered in a vacuum furnace at a he...

Embodiment 3

[0047] Fluorescent ceramic sheet (Lu 1.99 Ce 0.005 PR 0.005 Ca)(Mg 2 Si 3 )O 12 The preparation method is as follows:

[0048] (1) Weigh Lu by stoichiometric ratio 2 o 3 : 3.9594g, CeO 2 : 0.0086, Pr 6 o 11 : 0.0085g, CaCO 3 : 1.0087g, MgO: 0.8061g, SiO 2 : 1.8025g. Use a grinding tank to add agate balls, and use absolute ethanol as the grinding medium for grinding and mixing until the average particle size of the powder is less than 1 μm;

[0049] (2) Dry and sieve the obtained slurry, keep the sieved powder at 900°C for 2 hours in the air, remove the organic matter in the powder, and let the CaCO 3 Fully decompose; after sieving the obtained powder, apply a pressure of 10Mpa equiaxially and unidirectionally to keep it for 2min, dry press molding, press it into a green body in a cold isostatic pressing equipment, the pressure is 200MPa, and the holding time is 2min;

[0050] (3) The obtained ceramic green body is sintered in a vacuum furnace at a heating rate of...

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Abstract

The invention provides a fluorescent ceramic material with the chemical formula of (A(2-x)RexM)(Mg2D3)O12, wherein A is at least one of Y, Lu, Sc, Gd and Ga, Re is at least one of Eu, Ce, Pr, Sm, Dy,Tm, Tb and Nd, M is at least one of Ca, Sr and Ba, D is at least one of Ti, Si and Ge, and x is larger than or equal to 0.001 and smaller than 2. The fluorescent ceramic can be effectively excited bya blue light chip, and a low-color-temperature white light LED can be produced in combination with the blue light chip. Meanwhile, the fluorescent ceramic has the mechanical performance incomparable to fluorescent powder and can be directly packaged with the blue light chip, the packaging mode of fluorescent powder and organic materials at present is replaced, the problems of poor heat dissipationof organic packaging materials and lighting effect reduction and color drifting caused by continuous high temperature are solved effectively, and the service life of a white light LED device is prolonged substantially.

Description

technical field [0001] The invention relates to a transparent fluorescent ceramic material, in particular to a fluorescent ceramic material, a preparation method thereof and an application thereof for preparing a low color temperature white light LED. Background technique [0002] As the fourth-generation lighting source, white LED has the advantages of energy saving, environmental protection, long life and quick response. It has achieved remarkable development and is widely used in various lighting scenarios. At present, the manufacturing method of commercial white light LED usually adopts encapsulation technology to encapsulate more than one kind of fluorescent powder on the blue light chip with organic materials such as epoxy resin or silica gel. However, this packaging method has some problems in actual use: First, the heat dissipation performance of the organic packaging material is poor, and the temperature of the chip will be higher than 150°C when the chip is lit for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79H01L33/50C04B35/20C04B35/64C04B35/626
CPCC04B35/20C04B35/6261C04B35/64C04B2235/3208C04B2235/3215C04B2235/3224C04B2235/3229C04B2235/6562C04B2235/6582C04B2235/9646C09K11/7774H01L33/502Y02B20/00
Inventor 孙鹏刘永福蒋俊江浩川
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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