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.
ACS Appl Mater Interfaces. 2015 Jan 21;7(2):1035-9. doi: 10.1021/am507132a. Epub 2015 Jan 9.
An ultraviolet (UV) transparent and stable methyl-siloxane hybrid material was prepared by a facile sol-gel method. The transparency and stability of a UV-LED encapsulant is an important issue because it affects UV light extraction efficiency and long-term reliability. We introduced a novel concept for UV-LED encapsulation using a thermally curable oligosiloxane resin. The encapsulant was fabricated by a hydrosilylation of hydrogen-methyl oligosiloxane resin and vinyl-methyl siloxane resin, and showed a comparable transmittance to polydimethylsiloxane (PDMS) in the UVB (∼300 nm) region. Most remarkably, the methyl-siloxane hybrid materials exhibited long-term UV stability under light soaking in UVB (∼300 nm) for 1000 h.
一种紫外（UV）透明且稳定的甲基硅氧烷杂化材料通过简便的溶胶-凝胶法制备。UV-LED 封装材料的透明度和稳定性是一个重要问题，因为它会影响 UV 光提取效率和长期可靠性。我们提出了一种使用热固化低聚硅氧烷树脂进行 UV-LED 封装的新概念。该封装剂是通过氢化甲基低聚硅氧烷树脂和乙烯基甲基硅氧烷树脂的氢硅烷化反应制备的，在 UVB（约 300nm）区域表现出与聚二甲基硅氧烷（PDMS）相当的透过率。最显著的是，甲基硅氧烷杂化材料在 1000 小时的 UVB（约 300nm）光浸泡下表现出长期的 UV 稳定性。
