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ACS Appl Mater Interfaces. 2014 Mar 12;6(5):3115-21. doi: 10.1021/am500315y. Epub 2014 Feb 24.

Sol-gel derived transparent zirconium-phenyl siloxane hybrid for robust high refractive index LED encapsulant.

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Laboratory of Optical Materials and Coating (LOMC) Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon, Republic of Korea.


We report a zirconium-phenyl siloxane hybrid material (ZPH) that can be used as a robust LED encapsulant. The ZPH encapsulant was fabricated via hydrosilylation-curing of sol-gel derived multifunctional (vinyl- and hydride-functions) siloxane resins containing phenyl-groups and Zr-O-Si heterometallic phase for achieving a high refractive index (n ≈ 1.58). In thermal aging, the ZPH LED encapsulant exhibited superior performances with a high optical transparency (∼88% at 450 nm) and exhibited high thermal stability (no yellowing at 180 °C for 1008 h), compared to a commercial LED encapsulant (OE-6630, Dow Corning Corporation). This suggests potential for ZPH to be a robust LED encapsulant.

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