|Titolo:||Phosphors for LED-based light sources: Thermal properties and reliability issues|
|Data di pubblicazione:||2012|
|Citazione:||Phosphors for LED-based light sources: Thermal properties and reliability issues / Dal Lago M; Meneghini M; Trivellin N; Mura G; Vanzi M; Meneghesso G; Zanoni E. - 52:9-10(2012), pp. 2164-2167.|
|Abstract:||The aim of this work is to investigate the thermal stability of remote phosphor plates to be used in solid-state lighting systems, for the conversion of the blue light emitted by GaN-based LEDs into white light. A preliminary thermal characterization revealed that in normal conditions of blue light irradiance the phosphor plates can reach temperature levels higher than 60 °C, which can affect both performance and reliability. The results of accelerated thermal stress tests indicate that high temperature levels can trigger a relevant degradation mechanism (estimated activation energy is 1.2 eV), that drastically reduces the phosphor conversion efficiency and modifies the photometric and colorimetric characteristics of the emitted white light.|
|Tipologia:||1.1 Articolo in rivista|
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