Cycloaliphatic epoxy oligosiloxane‐derived hybrid materials for a high‐refractive index LED encapsulant |
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Authors: | SeungCheol Yang Joon‐Soo Kim JungHo Jin Seung‐Yeon Kwak Byeong‐Soo Bae |
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Affiliation: | Laboratory of Optical Materials and Coating (LOMC), Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305‐701, Republic of Korea |
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Abstract: | Cycloaliphatic epoxy oligosiloxane resins with a high degree of condensation (>85%) were synthesized by a nonhydrolytic sol–gel reaction using 2‐(3,4‐epoxycyclohexyl)ethyltrimethoxysilane (ECTS), diphenylsilanediol (DPSD), and triphenylsilanol (TPS). Cycloaliphatic epoxy hybrimers with 2 mm thickness fabricated by thermal curing of cycloaliphatic epoxy oligosiloxane resins with a hardener and catalyst were optically transparent (~90%) with a high refractive index of up to 1.583. The fabricated hybrimers also show high thermal resistance having no yellowing during thermal aging at 120°C for 1008 h and a high decomposition temperature (>300°C). On the strengths of these characteristics, the hybrimers are expected to find application as LED encapsulants. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011. |
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Keywords: | light‐emitting diodes oligomers refractive index transparency UV– vis spectroscopy |
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