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中文摘要：
针对用蓝光芯片激发YAG黄色荧光粉实现白光LED的光谱中缺少红色波段成份导致的显色性较差，通过在YAG荧光粉中混合质量分数分别为1％、3％、5％和10％的有机红光材料MEH—PPV，以提高白光LED的显色指数。将制备的白光LED加700mA冲击电流，通过对冲击前后光谱变化的分析结果发现，在大电流冲击下，由于散热不完善，PN结的热阻非常大，导致LED芯片快速老化，并且使有机材料MEH—PPV分解而大量失效；但是对比冲击前后黄光波段的光谱几乎没有变化。这表明，虽然MEH—PPV可以提高器件的显色指数，但是稳定性远不如YAG荧光粉。
英文摘要：
Blue chip excitating YAG phosphor is one of the most commerda! methods to realize the white LED. This method shows poor color rendering index because of lack of red band composition. The color rendering index of white LED is improved in this paper. Here,the MEH-PPV is mixed into YAG phosphors with the concentrations of 1 wt%,3 wtG ,5 wt; and 10 wt % ,respectively. We analyze the spectral changes at the current of 700 mA for the white LED. Under the impact of large current,we can obviously find the high thermal resistance from PN junction to the external environment because the cooling is not perfect. The high temperature will lead to rapid aging of LED chips and make MEH-PPV decompose and lose efficacy. The large current impact is yellow band before and after almost unchanged, which suggests that MEH-PPV can improve color rendering index, but its stability is far less than that of YAG phosphors.
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