Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 46, Issue -, Pages 168-175Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2014.09.008
Keywords
Encapsulant; LEDs; Silicone; Refractive index; TiO2; Extraction efficiency
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Funding
- Ministry of Science and Technology [NSC 103-2218-E-037-001]
- CPC Corporation
- I-Shou University
- Kaohsiung Medical University (KMU), Taiwan [KMU-Q103001]
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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.
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