Investigation of Color Shift of Plastics Lenses in LED-Based Products

Conference paper (2013)

Authors

S.W. Koh Electronic Components, Technology and Materials - EEMCS , State Key Laboratory of Solid State Lighting, Beijing Delft Institute of Intelligent Science and Technology
M. Yazdan Mehr Materials Innovation Institute
H. Ye Materials Innovation Institute, Electronic Components, Technology and Materials - EEMCS
J. Wei State Key Laboratory of Solid State Lighting, Electronic Components, Technology and Materials - EEMCS
Willem van Driel Philips Lighting Research, Electronic Components, Technology and Materials - EEMCS
Guo Zhang Chinese Academy of Sciences, Beijing Delft Institute of Intelligent Science and Technology , Electronic Components, Technology and Materials - EEMCS
Research Group
Electronic Components, Technology and Materials (EEMCS) (TU Delft)
More Info
expand_more

Published Date

2013

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

Abstract

Although color shift is one of the key issues to be considered for the failure of LEDs products, there is limited literature that correlated LED products' lifetime performance to their color shift over time. This is mainly due to the lack of a suitable model to define the color shift over time. In this paper, a methodology for characterizing and predicting the color shift of the polycarbonate materials in LED products is developed. It had shown that the color shift follows the 1st order reaction. Furthermore, the rate coefficient k of the reaction was found to follow Arrhenius relationship with activation energy of 0.046eV.