Print Email Facebook Twitter Study on the Degradation of Optical Silicone Exposed to Harsh Environments Title Study on the Degradation of Optical Silicone Exposed to Harsh Environments Author Yazdan Mehr, M. (TU Delft Electronic Components, Technology and Materials) van Driel, W.D. (TU Delft Electronic Components, Technology and Materials; Signify) De Buyl, Francois (Dow Silicones) Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials) Date 2018 Abstract Degradation mechanisms of silicone plates under harsh environment conditions are studied in this investigation. Environmental degradation of silicone free form, used as secondary optics in Light Emitting Diode LED lighting lamps and luminaires or any other applications requiring high quality optics being used, has negative implications for the optical performance. Degradation of silicone plates in harsh environment conditions was studied in salt bath and swimming water environments, using different light radiation and temperatures. Samples were exposed to harsh environment conditions for up to 4 months. Optical and chemical characteristics of exposed plates were studied using an Fourier transform infrared- attenuated total reflection FTIR-ATR spectrometer, an integrated sphere, and a Lambda 950 Ultraviolet-Visible UV-VIS spectrophotometer. Results show that 100 °C salt bath exposure had the most severe degrading effect on the optical characteristic of silicone plates. Increasing exposure time in the salt bath at that high temperature is associated with a significant deterioration of both optical (i.e., light transmission and relative radiant power value) and mechanical properties of silicone samples. On the contrary, silicone plates showed a great degree of stability against light exposure (UV at 360 nm and blue light at 450 nm) Subject LEDdegradationharsh environmentlightingsiliconeopticOA-Fund TU Delft To reference this document use: http://resolver.tudelft.nl/uuid:d4d9f200-c2ae-4b65-9e78-44c88ac417a4 DOI https://doi.org/10.3390/ma11081305 ISSN 1996-1944 Source Materials, 11 (8), 1-10 Part of collection Institutional Repository Document type journal article Rights © 2018 M. Yazdan Mehr, W.D. van Driel, Francois De Buyl, Kouchi Zhang Files PDF materials_11_01305_v2.pdf 1.29 MB Close viewer /islandora/object/uuid:d4d9f200-c2ae-4b65-9e78-44c88ac417a4/datastream/OBJ/view