Journal
IEEE TRANSACTIONS ON DEVICE AND MATERIALS RELIABILITY
Volume 13, Issue 1, Pages 316-318Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TDMR.2012.2214780
Keywords
Degradation; light-emitting diode (LED); phosphor
Funding
- University of Padova (Progetto Giovani Ricercatori)
- CARIPARO Foundation
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This paper reports on an extensive analysis of the degradation of remote phosphors for solid-state lighting applications. The study is based on combined optical and thermal measurements, carried out before and during long-term stress tests, and provides the following results: 1) During normal operation, phosphors can show significant self-heating; 2) as a consequence of self-heating, the conversion efficiency of the phosphors decreases; and 3) exposure to long-term stress tests at moderate/high temperature levels (in the range of 85 degrees C-145 degrees C) can lead to remarkable degradation of the phosphors. Degradation mainly consists in a decrease in conversion efficiency and in worsening of the chromatic properties of the light-emitting diode-phosphor system. Finally, an activation energy value of 1.2 eV was extrapolated for the thermally activated degradation of the phosphors.
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