Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5399142 | Journal of Luminescence | 2016 | 10 Pages |
Abstract
For a systematic approach to improve the reliability and the white light quality of phosphor converted light-emitting diodes (LEDs) it is imperative to gain a better understanding of the individual parameters that affect color temperature constancy and maintenance. By means of a combined optical and thermal simulation procedure, in this contribution we give a comprehensive discussion on the impact of different thermal conductivities of the color conversion elements (CCE) of phosphor converted LEDs on their respective thermal load for different current driving schemes. In particular we show that, while for the thermal load of CCEs with low thermal conductivities also effects due to the non-linearity between the blue radiant flux and the current have to be considered, these effects are largely diminished in case of CCEs with higher thermal conductivities.
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Physical and Theoretical Chemistry
Authors
Paul Fulmek, Johann Nicolics, Wolfgang Nemitz, Susanne Schweitzer, Christian Sommer, Paul Hartmann, Franz Schrank, Franz P. Wenzl,