4 March 2013 Characterization and endurance study of aluminate/silicate/garnet/nitride phosphors for high-performance SSL
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Abstract
With this work we report on the performance and degradation mechanism of commercially available remote phosphors (RP) for SSL. Thermal analysis indicates that phosphors can reach temperatures above 60°C during operation at an ambient temperature of 25°C when subjected to an optical power of 346 mW/cm2. We also demonstrate that temperature is a strong driving force for the degradation. Results indicate a gradual reduction in luminous flux output and a decrease of correlated color temperature as a consequence of stress. We demonstrate that the degradation rate is strongly correlated with stress temperature with an activation energy of 1.36 eV for a TTF of 70%.
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Nicola Trivellin, Nicola Trivellin, Matteo Meneghini, Matteo Meneghini, Matteo Dal Lago, Matteo Dal Lago, Diego Barbisan, Diego Barbisan, Marco Ferretti, Marco Ferretti, Gaudenzio Meneghesso, Gaudenzio Meneghesso, Enrico Zanoni, Enrico Zanoni, } "Characterization and endurance study of aluminate/silicate/garnet/nitride phosphors for high-performance SSL", Proc. SPIE 8641, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVII, 86411H (4 March 2013); doi: 10.1117/12.2005291; https://doi.org/10.1117/12.2005291
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