15 October 2012 White light quality of phosphor converted LEDs from a phosphor materials perspective of view: an evaluation based on combined thermal and optical simulations
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Abstract
Color constancy and color maintenance are key issues in the context of the utilization of light-emitting diodes (LEDs) for general lighting applications. For a systematic approach to improve the white light quality of phosphor converted LEDs and to fulfill the demands for color temperature reproducibility and constancy, it is imperative to understand how compositional, optical and thermal properties of the color conversion elements (CCE), which typically consist of a phosphor particles embedded in a transparent matrix material, affect the correlated color temperature of a white LED source. Based on a combined optical and thermal simulation procedure, in this contribution we give a comprehensive discussion on the underlying coherences of light absorption, quantum efficiency and thermal conductivity and deduce some strategies to minimize the temperature increase within the CCE in order to maintain acceptable color variations upon device operation.
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Franz-Peter Wenzl, Christian Sommer, Paul Hartmann, Peter Pachler, Hans Hoschopf, Gregor Langer, Paul Fulmek, Johann Nicolics, "White light quality of phosphor converted LEDs from a phosphor materials perspective of view: an evaluation based on combined thermal and optical simulations", Proc. SPIE 8484, Twelfth International Conference on Solid State Lighting and Fourth International Conference on White LEDs and Solid State Lighting, 848403 (15 October 2012); doi: 10.1117/12.929970; https://doi.org/10.1117/12.929970
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