Influence of thermal effect on white LED photoelectric properties
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摘要:
分别采用20 m s快速脉冲测量和20 s持续直流测量的方法，对白光L ED的光电参数进行测量，研究热效应对白光L ED的发光光谱、光通量、色温、荧光粉能量转换效率、光色变化等参数的影响。研究结果表明，随着电流的增加，通过20 s持续直流后的白光L ED的光通量增速变慢，荧光粉能量转换效率降低，光色变化大。
Abstract:
We analyzes the thermal effect on white LED by 20 milliseconds single pulse power supply and 20 seconds direct current (DC) power supply .The emission spectra ,light output power ,color tempera‐ture ,phosphor energy conversion efficiency ,light‐color changed and so on was analyzed .The results show that the luminous flux increased slowly after lighting 20 seconds ,the temperature color changed greatly , the phosphor conversion efficiency reduced and LED light‐color changed a lot with the further increasing of injection current .
