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Method for improving sedimentation performance of fluorescent powder for LED (Light Emitting Diode) packaging

A technology of LED encapsulation and sedimentation performance, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of low surface activity of phosphors, and achieve the effect of enhancing interaction force, improving comprehensive performance, and reducing agglomeration effect.

Active Publication Date: 2014-09-03
江苏矽时代材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Coupling agent is a kind of compound containing both organic and inorganic reactivity in the molecule. Coupling agent can effectively connect inorganic materials and organic materials through covalent bonds. Therefore, inorganic particles are often pretreated by coupling agent to improve Dispersion and enhanced binding force; however, in the white LED encapsulation adhesive system, the phosphor powder has low surface activity, which limits the application of coupling agent modification to a certain extent. It can be pre-coated with a layer of silica on its surface to increase Surface hydroxyl content, and then introduce functional groups on the surface through coupling agent condensation reaction to achieve the purpose of modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Prepare modified phosphor powder for LED packaging, the steps are as follows:

[0031] S1. Weigh 1g YAG:Ce 3+ Phosphor powder, add 50mL water-ethanol solution (45mL ethanol, 5mL deionized water), mix evenly, add ammonia water dropwise, adjust the pH value to 8-10, put it in an ultrasonic disperser, disperse for 10 min under 200w power, and get suspension;

[0032] S2. Under mechanical stirring, drop all the mixture of tetraethyl orthosilicate and ethanol into the S1 suspension. During the dropping process, the pH value of the system is kept constant by adding ammonia water. After fully reacting for 6-8 hours, use Wash with ethanol for 3 to 5 times, and dry in a vacuum oven at 80°C for 2 to 3 hours to obtain a silica-coated phosphor;

[0033] S3. Mix 0.5g of silica-coated fluorescent powder, 0.025g of silane coupling agent KH560 and 50mL of anhydrous toluene evenly. Under mechanical stirring, react at 110°C for 3 hours. After natural cooling, wash with anhydrous tol...

Embodiment 2

[0036] 1. Prepare modified phosphor powder for LED packaging, the steps are as follows:

[0037] S1. Weigh 1g TAG:Ce 3+ Phosphor powder, add 50mL water-ethanol solution (40mL ethanol, 10mL deionized water), mix evenly, add ammonia water dropwise, adjust the pH value to 8.5-11, put it in an ultrasonic disperser, disperse for 20 min under 150w power, and get suspension;

[0038] S2. Under mechanical stirring, drop all the mixed solution of tetraethyl orthosilicate and ethanol into the S1 suspension, control the pH value of the system by dropping ammonia water during the dropping process, and wash with ethanol after fully reacting for 4 to 6 hours 3 to 5 times, drying in a vacuum oven at 90°C for 3 h to obtain a silica-coated phosphor;

[0039] S3. Mix 0.5g silica-coated fluorescent powder, 0.01g coupling agent KH550, 0.01g coupling agent KH570 and 50mL anhydrous toluene evenly, and react at 80°C for 8h under mechanical stirring. After natural cooling, use Washed with water tolu...

Embodiment 3

[0042] 1. Prepare modified phosphor powder for LED packaging, the steps are as follows:

[0043] S1. Weigh 1g BaAl 2 Si 2 o 8 :Eu 2+ Phosphor powder, add 50mL water-ethanol solution (47mL ethanol, 3mL deionized water), mix evenly, add ammonia water dropwise, adjust the pH value to 8-10, put it in an ultrasonic disperser, disperse for 10 min under 300w power, and get suspension;

[0044] S2. Under mechanical stirring, drop all the mixture of tetraethyl orthosilicate and ethanol into the S1 suspension. During the dropping process, the pH value of the system is kept constant by adding ammonia water. After fully reacting for 6-8, wash with ethanol 3 to 5 times, drying in a vacuum oven at 80°C for 3 hours to obtain a silica-coated phosphor;

[0045] S3. Mix 0.5g of silica-coated phosphor, 0.01g of coupling agent CT114, 0.01g of coupling agent TC-105 and 50mL of anhydrous toluene. Under mechanical stirring, react at 110°C for 6h. After natural cooling, Wash with anhydrous tolu...

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Abstract

The invention provides a method for improving the sedimentation performance of fluorescent powder for LED (Light Emitting Diode) packaging. The method mainly comprises the following steps: (1) carrying out ultrasonic dispersion on the fluorescent powder in a water-ethanol solution, dropwise adding ammonium hydroxide and regulating a pH (Potential Of Hydrogen) value so as to obtain a turbid liquid; (2) dropwise adding a mixed solution of tetraethyl orthosilicate and ethyl alcohol into the turbid liquid, fully reacting and then washing and drying so as to obtain the fluorescent powder wrapped by SiO2; and (3) mixing the fluorescent powder wrapped by SiO2, a coupling agent and anhydrous toluene, reacting in a heating manner, washing and drying so as to obtain the modified fluorescent powder. According to the method, the compatibility and the interaction force of the fluorescent powder with a silica gel or an epoxy resin for the LED packaging are enhanced by mainly modifying the surface of the fluorescent powder, so that the compatibility and the sedimentation stability of the fluorescent powder in a packaging adhesive are improved. Thus, the product consistency is improved.

Description

technical field [0001] The invention belongs to the field of LED packaging material modification. More specifically, it relates to a method for improving the settling performance of phosphor powder used in LED packaging. Background technique [0002] LED (Light Emitting Diode), also known as light-emitting diode, is an electronic device that can effectively convert electrical energy into light energy. It has the advantages of high efficiency, energy saving, and environmental protection. Since the birth of LED, especially the advent of white LED in the 1990s, it has brought a new lighting concept to people. Compared with traditional lighting sources such as incandescent lamps and fluorescent lamps, white LEDs have the advantages of long life, small size, fast response, no pollution, high reliability, and wide application range. In addition, they can greatly reduce energy consumption and improve energy utilization. . At present, white LED has been recognized as the most eff...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/80C09K11/59
Inventor 周英杰
Owner 江苏矽时代材料科技有限公司
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