将MEH-PPV混合入YAG荧光粉中,并利用实验室自主研发的一种集成封装LED散热支架替代传统支架,该支架可利用热电偶直接测量出结温。研究了结温对混合MEH-PPV的白光LED光谱特性的影响。实验表明,随着结温的不断升高,蓝光光谱峰值随着结温的升高而不断下降,发生红移;荧光粉的吸收增强,黄光波段和红光波段的光谱峰值先增后减,并且红光波段的光谱发生蓝移;器件的显色指数从90.3下降至78.6,色温从3265K先快速升高至3672K,随后又缓慢下降至3612K,而光通量和发光效率则表现为先上升后下降,且它们的下降趋势基本吻合。
Mixing MEH-PPV with YAG phosphors,we utilize a new kind of light-emitting diodes which are encapsulated the LED chip to the aluminum plate directly to replace the traditional stent.The junction temperature can be directly measured by the thermocouple.Research the influence of the junction temperature on white LED spectral characteristics.Experiments show that: with the junction temperature rising,blue spectrum peak was declining and red shift was occurred;the absorption of phosphor was enhanced,while yellow and red spectral peaks increase first and then decrease;the blue shift of the red light band spectrum was occurred;and the color render index falls from 90.3 to 78.6,while the color temperature increases from 3265K to 3672K rapidly first,then drop to 3612K slowly;the flux and luminous efficiency have the same variation trend which increase first and then decrease.
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