Impact of extinction coefficient of phosphor on thermal load of color conversion elements of phosphor converted LEDs  

作　　者：F.P.Wenzl P.Fulmek C.Sommer S.Schweitzer W.Nemitz P.Hartmann P.Pachler H.Hoschopf F.Schrank G.Langer J.Nicolics 

机构地区：[1]Institute for Surface Technologies and Photonics, Joanneum Research Forschungsgesm.b.H., Franz-Pichler Stra?e 30, A-8160 Weiz, Austria [2]Institute of Sensor & Actuator Systems, Vienna University of Technology [3]Tridonic Jennersdorf GmbH, Technologiepark 10, A-8380 Jennersdorf, Austria [4]Austria Technologie & Systemtechnik AG, Fabriksgasse 13, A-8700 Leoben, Austria

出　　处：《Journal of Rare Earths》2014年第3期201-206,共6页稀土学报（英文版）

基　　金：Project supported by the"Neue Energien 2020"Program of the Austrian Climate and Energy Fund(827784)

摘　　要：Besides their direct impact on the respective correlated color temperature, the extinction coefficient and the quantum effi- ciency of the phosphor also have tremendous impact on the thermal load of the color conversion elements of phosphor converted LEDs under operation. Because of the low thermal conductivity of the silicone matrix in which the phosphor particles are typically embedded, the by far highest temperatures within the LED assembly are reached within the color conversion element. Based on a combined optical and thermal simulation procedure we show that in particular a larger value for the extinction coefficient might have a beneficial impact on the resulting thermal load.Besides their direct impact on the respective correlated color temperature, the extinction coefficient and the quantum effi- ciency of the phosphor also have tremendous impact on the thermal load of the color conversion elements of phosphor converted LEDs under operation. Because of the low thermal conductivity of the silicone matrix in which the phosphor particles are typically embedded, the by far highest temperatures within the LED assembly are reached within the color conversion element. Based on a combined optical and thermal simulation procedure we show that in particular a larger value for the extinction coefficient might have a beneficial impact on the resulting thermal load.

关 键 词：light-emitting diode color conversion PHOSPHOR rare earths 

分 类 号：TN312.8[电子电信—物理电子学]