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30 September 2013 Thermal and optical aspects of glob-top design for phosphor converted white LED light sources
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For a systematic approach to improve the white light quality of phosphor converted light-emitting diodes (LEDs) for general lighting applications it is imperative to get the individual sources of error for correlated color temperature (CCT) reproducibility and maintenance under control. In this regard, it is of essential importance to understand how geometrical, optical and thermal properties of the color conversion elements (CCE), which typically consist of phosphor particles embedded in a transparent matrix material, affect the constancy of a desired CCT value. In this contribution we use an LED assembly consisting of an LED die mounted on a printed circuit board by chip-on-board technology and a CCE with a glob-top configuration on the top of it as a model system and discuss the impact of the CCE shape and size on CCT constancy with respect to substrate reflectivity and thermal load of the CCEs. From these studies, some general conclusions for improved glob-top design can be drawn.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christian Sommer, Paul Fulmek, Johann Nicolics, Susanne Schweitzer, Wolfgang Nemitz, Paul Hartmann, Peter Pachler, Hans Hoschopf, Franz Schrank, Gregor Langer, and Franz P. Wenzl "Thermal and optical aspects of glob-top design for phosphor converted white LED light sources", Proc. SPIE 8835, LED-based Illumination Systems, 88350J (30 September 2013);

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