Reliability and diffusion-controlled through thickness oxidation of optical materials in LED-based products |
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| Affiliation: | 1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Delft University of Technology, EEMCS Faculty, Delft, The Netherlands;1. State Key Lab of Electronic Thin Films & Integrated Devices, University of Electronic Science & Technology of China, Chengdu, China;2. Institute of Biomedical Engineering, Chinese Academy of Medical Science and Peking Union Medical College, 300192 Tianjin, China;3. Design center, Avic Beijing Keeven Aviation Instrument CO., LTD, China Aviation Industry Corporation, Beijing, China;1. Department of Manufacturing and Materials Engineering, University of Campinas, UNICAMP, 13083-860 Campinas, SP, Brazil;2. Federal Institute of Education, Science and Technology of Pará, IFPA, 66093-020 Belém, PA, Brazil;1. Department of Electrical Engineering, National Taiwan Normal University, Taiwan;2. Institute of Electronics, National Chiao Tung University, Taiwan;1. Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan, ROC;2. Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC;3. Department of Mechanical Engineering, National Chung Cheng University, Chia-Yi 621, Taiwan, ROC;4. Research Group of Biomedical Image Processing, Shing-Tung Yau Center, National Chiao Tung University, Hsinchu 300, Taiwan, ROC;5. Department of Electronics Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC;6. Material and Design Engineering Division Engineering Center, Siliconware Precision Industries Co., Ltd., Taichung 400, Taiwan, ROC;7. Department of Mechatronic Engineering, National Taiwan Normal University, Taipei City 106, Taiwan, ROC |
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| Abstract: | In this study the temperature-induced oxidation reaction in bisphenol A polycarbonate (BPA-PC), leading to discoloration of the polymer used in solid state lighting applications, is studied. BPA-PC plates used as optical material in LED-based products suffer from yellowing and discoloration during service, resulting in a gradual deterioration of optical performance of the product. Discoloration reaction is greatly influenced by the temperature-induced oxidation of the polymer. In this study BPA-PC plates are aged at elevated temperature of 100–140 °C for a period up to 3000 h, aiming for accelerated oxidation of the plates. Diffusion of oxygen through the aged sample is studied up to 40 μm. A significant oxygen uptake is observed up to 20 μm. Activation energy of oxygen diffusion is measured to be 0.25 eV, which is close to activation energy of degradation reaction, reported in our previous works. |
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