Print Email Facebook Twitter Reliability and Lifetime Assessment of Optical Materials in LED-Based Products Title Reliability and Lifetime Assessment of Optical Materials in LED-Based Products Author Yazdan Mehr, M. (TU Delft Electronic Components, Technology and Materials) van Driel, W.D. (TU Delft Electronic Components, Technology and Materials; Philips Lighting Research) Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials; Chinese Academy of Sciences; State Key Laboratory of Solid State Lighting) Contributor van Driel, Willem Dirk (editor) Fan, Xuejun (editor) Zhang, Guo Qi (editor) Date 2018 Abstract Lumen depreciation is one of the major failure modes in light-emitting diode (LED) systems. It originates from the degradation of the different components within the system, including the chip, the driver, and the optical materials (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. A highly accelerated stress testing (HAST) setup and a methodology to extrapolate the results to real applications are therefore needed to test the reliability of LED package and lens materials. Employing 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 chapter aims at briefly explaining the degradation mechanism of optical components in LED package and how they contribute to the lumen depreciation of the LED package. The concept of HAST and the way the reliability of LED packages can be assessed will also be explained. Subject EncapsulantsYellowingBlue light exposureOxidationStress testing To reference this document use: http://resolver.tudelft.nl/uuid:e81d3d9b-3a8f-4e32-8920-7bc0c04d6b54 DOI https://doi.org/10.1007/978-3-319-58175-0_5 Publisher Springer, Cham Embargo date 2021-05-28 ISBN 978-3-319-58174-3 Source Solid State Lighting Reliability Part 2: Components to Systems (1) Series Solid State Lighting Technology and Application Series, 2196-4203, 3 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 book chapter Rights © 2018 M. Yazdan Mehr, W.D. van Driel, Kouchi Zhang Files PDF YazdanMehr2018_Chapter_Re ... sessme.pdf 1.15 MB Close viewer /islandora/object/uuid:e81d3d9b-3a8f-4e32-8920-7bc0c04d6b54/datastream/OBJ/view