加CdS薄层的有机电致磷光白光器件性能的优化

Performance Optimizaition of White POLEDs with CdS Thin Layer

采用CBP和MCP做主体,分别掺杂磷光铱配合物Ir(piq)2(acac)和FIrpic作为红光发光层和蓝光发光层,研究了红光发光层和蓝光发光层的位置对器件性能的影响,得出结构为ITO/2T/NPB/MCP∶Firpic/CBP/CBP∶Ir(piq)2(acac)/Bphen/CdS/LiF/Al的器件性能较好。当CdS的厚度为0.1nm,电流密度为161mA/cm2时,器件的最大效率比不加CdS的器件的最大效率提高了1.42倍。亮度也有较大提高。在电流密度为225mA/cm2(电压为17.5V)时,最大亮度为20 890cd/m2,比不加CdS的器件的最大亮度16 610cd/m2高出4 280cd/m2。

Using CBP and MCP as the main body and doping Ir(piq)2(acac)and(FIrpic)respectively as the red light emitting layer and the blue light emitting layer,the optimized organic light emitting diodes(OLEDs)with the structure of ITO/2T/NPB/MCP∶Firpic/CBP/CBP∶Ir(piq)2(acac)/Bphen/LiF/Al were fabricated.It is studied that when the thickness of CdS layer is 0.1nm and the current density is 161mA/cm2,the maximum efficiency of the device is 1.42 times of that without CdS thin layer.And the brightness is improved greatly.When the current density is 225 mA/cm2(the voltage is 17.5V),the maximum brightness of 20 890cd/m2 is realized,which is 4 280cd/m2 higher than that without CdS layer.