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Silicate 형광체 증가에 대한 발광 특성 및 신뢰성 분석
윤양기(Yanggi Yoon),장중순(Joongsoon Jang) 한국신뢰성학회 2012 신뢰성응용연구 Vol.12 No.4
This paper presents a changes of luminescence property for converted white LEDs with the commercially available silicate phosphor. If silicate phosphor"s quantity increase step by step. luminescence property will be changing. we analyze luminescence property for these change and carry out the high temperature aging test for 7,000 hours, the high temperature and humidity aging test for 7,000 hours for reliability. LED degradation not only results in reduced light output but also in color changes. so we monitor correlated color temperature (CCT), chromaticity coordinates(x, y) and spectrum intensity. Those results suggest that humidity factor more bad effect in color changes than temperature factor and Lighting quality is related with quantity of phosphor.