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On the Thermal Load of the Color‐Conversion Elements in Phosphor‐Based White Light‐Emitting Diodes
Author(s) -
Fulmek Paul,
Sommer Christian,
Hartmann Paul,
Pachler Peter,
Hoschopf Hans,
Langer Gregor,
Nicolics Johann,
Wenzl Franz P.
Publication year - 2013
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201300207
Subject(s) - phosphor , materials science , optoelectronics , light emitting diode , diode , thermal , reliability (semiconductor) , white light , color temperature , absorption (acoustics) , optics , composite material , thermodynamics , physics , power (physics)
For further improvements to the reliability and the white light quality of phosphor‐converted light‐emitting diodes (LEDs), it is imperative to understand how the compositional, optical, and thermal properties of the materials constituting the color‐conversion elements (CCEs) affect their respective thermal loads. By means of a combined optical and thermal simulation procedure, a comprehensive discussion is given on the underlying coherences of the absorption profile of the blue LED light, the phosphor concentration, the quantum efficiency of the phosphor, and the thermal conductivities of the CCEs. Some general strategies of material composition and design are deduced in order to minimize the thermal load of the CCEs, which is a prerequisite for correlated color temperature maintenance and long‐term material reliability of phosphor‐converted white LEDs.