发光层掺杂蓝色OLED的光电性能研究

Study on Optical and Electronic Performance of Highly Bright Bule OLED

采用真空热蒸镀技术,在不同的掺杂浓度下,制备了4种双异质型结构的蓝色有机电致发光器件(OLED),其结构为ITO/CuPc(30 nm)/NPB(40 nm)/TPBi(30 nm):GDI691(x%)/Alq3(20 nm)/LiF(1 nm)/Al(50 nm),其中x%为发光层掺杂浓度,分别取1、2、3和4%。从实验结果分析可知:蓝色OLED的电流-电压(I-V)特性曲线、亮度-电压(L-V)曲线、亮度-电流(L-I)曲线及效率等光电性能随着发光层掺杂浓度的变化而改变。当驱动电压为15 V、掺杂浓度为3%时,器件可获得最大亮度6 100 cd.m-2,色坐标CIE为x=0.147、y=0.215,最大流明效率为1.221 m.W-1,电致发光(EL)发光光谱的峰值为468 nm。

A new multilayer structure blue organic light-emitting diode（OLED） has been developed by vacuum deposition technique. The typical OLED structure is ITO/CuPc（30 nm）/NPB（40 nm）/TPBi（30 nm）：GDI691（x%）/Alqa （20 nm）/ LiF（1 nm）/AI（50 nm）, And x% is the doping consistence in emitter layer of OLED. In this letter,the optical and electronic performance show that including current,voltage,brightness,effidency and spectrum of the devices change with the doping the parameters consistence. When xG is 3~ ,the brighmess of the device reaches 6100 cd · m^-2 at the drive voltage of 15 V,CIE coordinates are x=0. 147,y=0. 215 and the maximum luminous efficiency is 1.22 lm· W^-1 ,the blue emission spectrum peak is 468 nm.