Sealant for large power LED, and large power LED

A sealant and high-power technology, which is applied in the field of high-power LED sealant, to achieve good working stability, improve heat dissipation effect, and ensure the effect of light transmission

Active Publication Date: 2015-07-15
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat dissipation problem of the current high-power LED needs to be further improved

Method used

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  • Sealant for large power LED, and large power LED
  • Sealant for large power LED, and large power LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Graphene is prepared by the technique of exfoliating graphite flakes with sodium cholate in liquid phase, or the graphene is first treated with strong acid, and then graphene is prepared by rapid thermal expansion above 2000°C per minute. Graphene preparation is a well-known technique , No longer go into details. The graphene was dispersed into the acetone solution by stirring first and then ultrasonic. The stirring time was 30 minutes, the ultrasonic time was 2 hours, and the power was 200W. The concentration of the obtained graphene solution is 1 mg / mL.

[0025] (2) Add silica gel to the graphene solution and stir for 30 minutes. The weight of graphene is 1% of silica gel.

[0026] (3) Put the mixed solution in a vacuum oven at 60°C for 1 hour to remove the acetone.

[0027] (4) Add the curing agent while stirring, the weight of the curing agent is 25% of the silica gel.

[0028] (5) Attachment figure 1 , Fill the graphene and silica gel composite material in the refl...

Embodiment 2

[0032] (1) Graphene is prepared by the technique of exfoliating graphite flakes with sodium cholate in liquid phase, or graphene is first treated with strong acid, and then graphene is prepared by rapid thermal expansion above 2000°C per minute. Graphene preparation is a well-known technique , No longer go into details. The graphene was dispersed into the acetone solution by stirring first and then ultrasonic. The stirring time was 30 minutes, the ultrasonic time was 2 hours, and the power was 200W. The concentration of the obtained graphene solution is 1 mg / mL.

[0033] (2) Add silica gel to the graphene solution and stir for 30 minutes. Graphene weight is 3% of silica gel.

[0034] (3) Put the mixed solution in a vacuum oven at 60°C for 1 hour to remove the acetone.

[0035] (4) Add the curing agent while stirring, the weight of the curing agent is 25% of the silica gel.

[0036] (5) Attachment figure 1 , Fill the graphene and silica gel composite material in the reflective cup ...

Embodiment 3

[0040] (1) Graphene is prepared by the technique of exfoliating graphite flakes with sodium cholate in liquid phase, or graphene is first treated with strong acid, and then graphene is prepared by rapid thermal expansion above 2000°C per minute. Graphene preparation is a well-known technique , No longer go into details. The graphene was dispersed into the acetone solution by stirring first and then ultrasonic. The stirring time was 30 minutes, the ultrasonic time was 2 hours, and the power was 200W. The concentration of the obtained graphene solution is 1 mg / mL.

[0041] (2) Add silica gel to the graphene solution and stir for 30 minutes. The weight of graphene is 10% of silica gel.

[0042] (3) Put the mixed solution in a vacuum oven at 60°C for 1 hour to remove the acetone.

[0043] (4) Add the curing agent while stirring, the weight of the curing agent is 25% of the silica gel.

[0044] (5) Attachment figure 1 , Fill the graphene and silica gel composite material in the reflect...

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Abstract

The invention discloses a sealant for a large power LED, and the large power LED. The sealant comprises a composite material composed of a high heat conduction filler and a matrix, the heat conductivity of the high heat conduction filler is 30-5300W / mK, the filler is one or a combination of more of graphene, a boron nitride sheet, a carbon nanotube, a boron nitride nanotube and a nanometer silver wire, and the matrix is silica gel or epoxy resin; and the mass percent of the high heat conduction filler in the composite material is 1-20%, and the mass percent of the matrix in the composite material is 80-99%. The inside and the outside of the reflection cup of the large power LED are filled with the sealant, and the sealant completely covers the LED chip and a pair of weld lines of the large power LED to obtain improved large power LED. The large power LED has good heat radiation effect and good work stability, and the sealant ensures that the light transmittance of the LED meets application requirements.

Description

【Technical Field】 [0001] The present invention relates to high-power LEDs, in particular to a sealant for high-power LEDs. 【Background technique】 [0002] LEDs are widely used in various fields such as traffic lights, LED displays, LCD backlights, car lights, lighting and lighting sources. The structure of the LED generally includes a heat dissipation substrate, an LED chip, a thermal conductive glue, a pair of bonding wires, an external electrode and a sealant. When the LED is working, the LED chip generates heat, and the heat conduction glue at the bottom of the LED dissipates the substrate, thereby transferring the heat of the LED chip to the outside air. In the process of improving the luminous efficiency of LEDs and the stability of their working under high currents, the thermal conductive glue, bonding wires, and heat dissipation substrates in the LED package have attracted much attention. The improvement of these components can improve the heat dissipation of the LED. Im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L63/00C08K9/04C08K3/04C08K7/00C08K3/08C08K9/00C08K3/38C08K9/02H01L33/56H01L33/64
CPCH01L2224/45139H01L2224/45144H01L2224/48091H01L2224/73265H01L2924/00011H01L2924/00014H01L2924/01049
Inventor 杜鸿达姚光锐郑心纬李佳干林褚晓东康飞宇李宝华杨全红徐成俊贺艳兵
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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