Reliability and optical properties of LED lens plates under high temperature stress |
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| Affiliation: | 1. Materials Innovation Institute (M2i), Delft, The Netherlands;2. Delft University of Technology, EEMCS Faculty, Delft, The Netherlands;3. Philips Lighting, Eindhoven, The Netherlands;4. Beijing Research Center, Delft University of Technology, Beijing, China;5. State Key Laboratory of Solid State Lighting, Beijing, China;1. Materials Innovation Institute (M2i), Mekelweg 2, 2628 CD, Delft, The Netherlands;2. Delft Institute of Microsystems and Nanoelectronics (Dimes), Delft University of Technology, Mekelweg 6, 2628 CD, Delft, The Netherlands;3. Research and Development Center for Semiconductor Lighting, Institute of Semiconductors, Chinese Academy of Sciences, Haidian, Beijing 100086, China;4. State Key Laboratory of Solid-State Lighting, Haidian, Beijing 100086, China;1. Moscow Engineering Physics Institute (NRNU “MEPhI”), Moscow, Russia;2. Centro Nacional de Microelectrónica (CNM, CSIC), Barcelona, Spain;3. Santa Cruz Institute for Particle Physics (SCIPP, UCSC), Santa Cruz, CA, USA;4. Lawrence Berkeley National Laboratory (LBNL), Physics Division, Berkeley, CA, USA;5. Brookhaven National Laboratory (BNL), Upton, NY, USA;6. University of Pennsylvania, Philadelphia, PA, USA;1. Texas Instruments, Haggertystr. 1, 85356 Freising, Germany;2. Infineon Technologies AG, Am Campeon 1-12, 85579 Neubiberg, Germany;1. Laurentian University, 935 Ramsey Lake Rd, Greater Sudbury, ON P3E 2C6, Canada;2. Power Film Inc., 2337 230th Street, Ames, IA 50014, USA;3. MIRARCO, 935 Ramsey Lake Rd, Greater Sudbury, ON P3E 2C6, Canada |
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| Abstract: | In this investigation the thermal degradation mechanisms of Bisphenol A Polycarbonate (BPA-PC) plates at the temperature range 100–140 °C are studied. The BPA-PC plates are currently used both in light conversion carriers in LED modules and optical lenses in LED-based products. In this study BPA-PC plates are aged at elevated temperature of 100–140 °C for a period up to 3000 h. Optical and chemical properties of the thermally-aged plates were studied using UV–Vis spectrophotometer, FTIR–ATR spectrometer, and integrated sphere. The results show that increasing the thermal ageing time leads to yellowing, loss of optical properties, and decrease of the light transmission and of the relative radiant power value of BPA-PC plates. The results also depict that there is not much discoloration within the first 1500 h of thermal ageing. The rate of yellowing significantly increases at the end of this induction period. Formation of oxidation products is identified as the main mechanism of yellowing. An exponential-based reliability model is also presented to calculate the rate of degradation reaction and to predict the life-time of BPA-PC plates. |
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| Keywords: | Polycarbonate Thermal degradation Yellowing LED lens Reliability |
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