采用蓝光 LED 芯片激发有机荧光材料2,3,5,6-tetrakis(3,6-di-t-Butylcarbazol-9-yl)-1,4-dicyano-benzene(4CzTPN-Bu),对其光谱、光效、色度特性进行了研究.结果表明,随着4CzTPN-Bu 质量分数的提高, LED蓝光芯片光谱逐渐减小并消失,4CzTPN-Bu 荧光粉的光谱逐渐增强,且当4CzTPN-Bu 质量分数为7％时,蓝光芯片与4CzTPN-Bu之间的能量转移最彻底；在光效方面,随着质量分数的增加,器件的光效先增加后减小,7％时达到最大,之后再减小.该过程的发生主要是荧光粉的被激发程度与能量传递过程中的损耗相互抗衡的结果.当4CzTPN-Bu质量分数增加时,器件色坐标经历了蓝色-蓝偏紫-红偏蓝-纯红的变化,纯红器件的色纯度达到99．8％.
The organic fluorescent material 2,3,5,6-tetrakis (3,6-di-Butylcarbazo-9-y1 )-1,4-dicyanobenzene (4CzTPN-Bu)is stimulated by the blue LED chip,its spectrum,light efficiency,chromaticity characteristics were studied.The results show that the spectrum from blue LED chip decreased gradually and disappeared, 4CzTPN-Bu phosphors spectrum gradually strengthen with the increase of mass fraction 4CzTPN-Bu,and when the mass fraction of 4CzTPN-Bu is 7%,the Forster energy transfer from blue chips to 4CzTPN-Bu is the most complete.In terms of light efficiency,with the increase of mass fraction,the device of light efficiency decreases after increasing first,up to maximum,then decreased.The occurrence of this process is mainly because there is competition between he excited level of phosphors and the loss in the process of energy transfer.When 4CzTPN-Bu mass fraction increases,the color coordinates range from the blue,blue purple,red blue to the pure red, and color purity of the full red device reached 99.8%.
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