Preparation and characterization of high refractive index silicone/TiO2 nanocomposites for LED encapsulants

被引:18
作者
Huang, Jui-Hsiung [1 ]
Li, Chiu-Ping [1 ]
Chang-Jian, Cai-Wan [2 ]
Lee, Kuen-Chan [3 ]
Huang, Jen-Hsien [1 ]
机构
[1] Chinese Petr Corp CPC Corp, Green Technol Res Inst, Dept Green Mat Technol, Kaohsiung 81126, Taiwan
[2] I Shou Univ, Dept Mech & Automat Engn, Kaohsiung, Taiwan
[3] Kaohsiung Med Univ, Dept Fragrance & Cosmet Sci, Kaohsiung, Taiwan
关键词
Encapsulant; LEDs; Silicone; Refractive index; TiO2; Extraction efficiency; LIGHT-EMITTING-DIODES; EXTRACTION EFFICIENCY; NANOPARTICLES; SURFACE;
D O I
10.1016/j.jtice.2014.09.008
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
In this study, a uniform dispersion of TiO2 nanoparticles (NPs) in silicone for light-emitting diode (LED) encapsulation is demonstrated prepared through high-energy grinding method. Through interaction with surfactant, large clumps of the TiO2 underwent de-aggregation to form a stable dispersed solution, during the grinding process. The silicone/TiO2 composites were prepared by the blending of silicone resin with grinding TiO2 fillers in isopropyl alcohol solvent, which was removed -before curing. The refractive index (RI) of surfactant-coated TiO2 NPs loaded silicone is 1.63 at 550 nm, significantly higher than that of conventional silicone (n = 1.50). The barrier properties and thermal conductivity (from 0.9 to 1.32 W/mK) of the silicone/TiO2 composites also can be enhanced, significantly. As a result, a high-power LED encapsulated with this composite showed more than 7.3% increase in the light output and better stability compared to that with the conventional silicone resin. (C) 2014 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:168 / 175
页数:8
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