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Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, Kouchi (author)A methodology, based on accelerated degradation testing, is developed to predict the lifetime of remote phosphor plates used in solid-state lighting (SSL) applications. Both thermal stress and light intensity are used to accelerate degradation reaction in remote phosphor plates. A reliability model, based on the Eyring relationship, is also...journal article 2015
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Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, Kouchi (author)In this paper, progresses of color maintenance, also known as color shift, in solid-state lighting (SSL) systems are thoroughly reviewed. First, color shift is introduced and a few examples are given from different real-life industrial conditions. Different degradation mechanisms in different parts of the system are also explained. Different...review 2015
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van Driel, W.D. (author), Yazdan Mehr, M. (author), Zhang, Kouchi (author)Solid State Lighting (SSL) technologies and products are gradually pervading into our daily life. An SSL system is composed of a LED engine with a micro-electronics driver(s), integrated in a housing that also provides the optical, sensing and other functions. Knowledge of (system) reliability is crucial for not only the business success of the...conference paper 2014
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Dong, J. (author), van Driel, W.D. (author), Zhang, Kouchi (author)This paper describes a new design concept of automatically diagnosing and compensating LED degradations in distributed solid state lighting (SSL) systems. A failed LED may significantly reduce the overall illumination level, and destroy the uniform illumination distribution achieved by a nominal system. To our knowledge, an automatic scheme to...journal article 2011