Print Email Facebook Twitter A review on discoloration and high accelerated testing of optical materials in LED based-products Title A review on discoloration and high accelerated testing of optical materials in LED based-products Author Yazdan Mehr, M. (TU Delft Electronic Components, Technology and Materials; Isfahan University of Technology) Toroghinejad, M.R. (Isfahan University of Technology) Karimzadeh, F. (Isfahan University of Technology) van Driel, W.D. (TU Delft Electronic Components, Technology and Materials) Zhang, Kouchi (Isfahan University of Technology) Date 2018 Abstract Reduction of intensity of light output is one of the most common degradation modes in light-emitting diode (LED) systems. It starts from the failure of the various components in the system, including the chip, the driver, and optical components (i.e. phosphorous layer). The kinetics of degradation in real life applications is relatively slow and in most cases it takes several years to see an obvious deterioration of optical properties. Highly Accelerated Stress Testing (HAST) set-up and a methodology to extrapolate the results to real time applications are therefore needed to test the reliability of LED packages and lens materials. Using HAST concept in LED industry is inevitable due to the necessity of assessing the reliability of new products in a short period of time. This paper aims at briefly clarifying the degradation mechanisms of optical components in LED packages and explaining how they contribute to the depreciation of light output of the LED systems. The concept of HAST and the way the reliability of LED packages can be evaluated will also be discussed. Subject EncapsulantLEDLens/encapsulantLumen depreciationReliability To reference this document use: http://resolver.tudelft.nl/uuid:5e1f7ffd-61a7-4d07-baa7-9ac2d3c85a6e DOI https://doi.org/10.1016/j.microrel.2017.12.023 Embargo date 2021-05-28 ISSN 0026-2714 Source Microelectronics Reliability, 81, 136-142 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2018 M. Yazdan Mehr, M.R. Toroghinejad, F. Karimzadeh, W.D. van Driel, Kouchi Zhang Files PDF 1_s2.0_S0026271417305814_main.pdf 868.15 KB Close viewer /islandora/object/uuid:5e1f7ffd-61a7-4d07-baa7-9ac2d3c85a6e/datastream/OBJ/view