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Preparation method of transparent fluorescent ceramic for LEDs (light-emitting diodes)

A fluorescent ceramic and transparent technology, applied in the field of LED transparent fluorescent material preparation, can solve the problems of low density of transparent ceramics, poor heat dissipation effect, uneven light output, etc., and achieve the effects of fewer types of raw materials, low production cost, and high light output rate.

Inactive Publication Date: 2015-01-21
SHANGHAI SANSI ELECTRONICS ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the density of transparent ceramics prepared by ordinary methods is low, and there are disadvantages such as uneven light output, poor heat dissipation effect and low light output rate when applied to the packaging of LED devices.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh α-Al with a purity of 99.99% 2 o 3 powder 95g, high-purity CaO powder 3.5g and yellow fluorescent powder Y 3 al 5 o 12 : Ce 3+ 1.5g is put into the ball mill jar of polyurethane, add 300g zirconia balls and 80g deionized water again, obtain mixture with 300r / min rotating speed ball mill 15 hours on the roller ball mill, then the mixture is taken out from the ball mill jar, then in Bake in an oven at 110°C for 5 hours. The powder was taken out, ground and passed through a 200-mesh sieve, and dry-pressed at 100 MPa for 3 minutes to obtain a green body, and then the green body was taken out and subjected to cold isostatic pressing at a pressure of 200 MPa for 5 minutes. Vacuum sinter the molded green body at 1600°C, hold for 10 hours, and vacuum degree is 2×10 -3 Pa, and then hot isostatic pressing and sintering the green body at 1700° C. under a pressure of 130 MPa for 3 hours. The sintered green body was annealed at 1300°C for 12 hours, and then cooled with ...

Embodiment 2

[0038] Weigh α-Al with a purity of 99.99% 2 o 3 powder 92.5g, high-purity CaO powder 7g and yellow fluorescent powder Y 3 al 5 o 12 : Ce 3+ 0.5g is put into the ball mill jar of polyurethane, add 300g zirconia balls and 80g deionized water again, obtain mixture with 300r / min rotating speed ball mill 15 hours on roller ball mill, then mixture is taken out from ball mill jar, then Bake in an oven at 110°C for 5 hours. The powder was taken out, ground and passed through a 200-mesh sieve, dry-pressed at 100 MPa for 3 minutes, and then the green body was taken out and subjected to cold isostatic pressing at 200 MPa for 5 minutes. Vacuum sinter the molded blank at 1580°C, hold for 10 hours, and vacuum degree is 2×10 -3 Pa, and then hot isostatic pressing and sintering the green body at 1650° C. under a pressure of 130 MPa for 3 hours. The sintered green body was annealed at 1250°C for 12 hours, and then cooled with the furnace. After grinding and polishing, a ceramic sheet w...

Embodiment 3

[0040] Weigh α-Al with a purity of 99.99% 2 o 3 Powder 96.5g, high-purity CaO powder 3g and yellow fluorescent powder Y 3 al 5 o 12 : Ce 3+0.5g is put into the ball mill jar of polyurethane, add 300g zirconia balls and 80g deionized water again, obtain mixture with 300r / min rotating speed ball mill 15 hours on the roller ball mill, then the mixture is taken out from the ball mill jar, then in Bake in an oven at 110°C for 5 hours. The powder was taken out, ground and passed through a 200-mesh sieve, and dry-pressed at 100 MPa for 3 minutes to obtain a green body, and then the green body was taken out and subjected to cold isostatic pressing at a pressure of 200 MPa for 5 minutes. Vacuum sinter the molded green body at 1500°C, hold for 10 hours, and vacuum degree is 2×10 -3 Pa, and then hot isostatic pressing and sintering the green body at 1650° C. under a pressure of 130 MPa for 3 hours. The sintered green body was annealed at 1250°C for 12 hours, and then cooled with t...

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Abstract

The invention discloses a preparation method of transparent fluorescent ceramic for LEDs (light-emitting diodes), which comprises the following steps: proportionally mixing high-purity ceramic raw material powder, a sintering assistant and fluorescent powder; adding into a ball milling tank, adding a ball milling medium and milling balls at the same time, and carrying out ball milling on the ball mill for some time; taking out the powder, drying, grinding and screening; sequentially carrying out dry press formation and cold isostatic compaction on the screened powder; sequentially carrying out vacuum sintering and hot isostatic compaction sintering on the formed billet; and carrying out annealing treatment to obtain the high-compactness transparent fluorescent ceramic for LEDs. In the formation and sintering steps, two different processes are respectively adopted, so that the prepared transparent fluorescent ceramic has higher compactness and better uniformity, and has better light emitting effect when being used for LED devices.

Description

technical field [0001] The invention belongs to the technical field of preparation of transparent fluorescent materials for LEDs, and in particular relates to a method for preparing transparent fluorescent ceramics for LEDs. Background technique [0002] Compared with common light sources, LED devices have many advantages such as fast response, low power consumption, long life, and no pollution. They have been used in lighting, display screens, backlights and other fields. LED lighting is called "green lighting" and has great potential for development. [0003] In the process of preparing white light LED devices, the packaging of phosphor powder is very critical, which is related to various properties such as luminous efficiency, color rendering, and service life of white light LEDs. The traditional encapsulation process is to mix phosphor powder with epoxy resin or silica gel in a certain proportion, stir evenly, and then apply it on the surface of the chip to form a coati...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/565C04B35/443C04B35/505C04B35/622C04B35/64
CPCC04B35/6261C04B35/115C04B35/505C04B35/565C04B2235/3206C04B2235/3208C04B2235/3222C04B2235/3229C04B2235/3232C04B2235/3262C04B2235/606C04B2235/6567C04B2235/658C04B2235/662C04B2235/668C04B2235/77C04B2235/9653
Inventor 陈必寿许礼王鹏崔佳国
Owner SHANGHAI SANSI ELECTRONICS ENG
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