基于NPB+Zn(4-TfmBTZ)2-电致激基复合物的有机电致白光器件

摘要

将不同浓度的NPB掺杂到一种新型有机电致发光材料Zn(4-TfmBTZ)2层中制备了有机电致白光及近白光器件,发现NPB浓度不仅影响器件的发光效率,而且影响器件的色度和显色指数.随着Zn(4-TfmB-TZ)2层中NPB摩尔分数从0％～10％逐渐增加,电致激基复合物的发射逐渐增强,器件发光效率先增加后减小,在相同电压下的发光颜色由蓝白到白逐步变为黄白.NPB掺杂摩尔分数为5％时,器件性能最优,在6～9 V的电压下,器件的色坐标变化范围为(0.28～0.32,0.33～0.35),显色指数为83.3～91.2,最大电流效率为0.87 cd/A.%The doping devices with the structure of ITO/NPB/Zn(4-TfmBTZ)2: NPB/LiF/Al are fabricated, where the NPB male fraction in Zn (4-TfmBTZ)2 layer is 0, 5% , 10% , 20% , respectively. The results show that the mole fraction of NPB in Zn(4-TfmBTZ)2 layer has important effect on the device performance, which contains not only efficiency but also chromaticity and color rendering index. As the NPB mole fraction in Zn(4-TfmBTZ)2 layer in creases gradually from 0 to 10% , the electroplex emission enhances gradually, the device efficiency increases firstly and hten reduces, and the light color becomes gradually from blue white, white to yellow white at the same voltage. When the mole fraction of NPB in Zn(4-TfmBTZ)2 layer is 5% , the device shows the best performance with the color coordinate region of (0. 28～0. 32,0. 33～0. 35) and the color rendering index of 83.3 ～91.2 at voltage of 6～~9 V. The maximum efficiency of this device is 0.87 cd/A.