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

摘要:

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20890cd/m²,比不加CdS的器件的最大亮度16610cd/m²高出4280cd/m²。

Abstract:

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 225mA/cm² (the voltage is 17.5V), the maximum brightness of 20890cd/m² is realized, which is 4280cd/m² higher than that without CdS layer.