【摘要】 增强空穴注入能力是提高有机电致发光器件(OLEDs)光电性能的一个重要因素.采用碱金属化合物Cu I掺杂NPB结构作为器件的空穴注入层,制备了空穴注入能力增强的有机磷光器件.当发光亮度为1 000 cd/m2时,器件的驱动电压为6. 44 V,相比于参考器件降低了约2. 11 V;器件的最大功率效率为7. 7 lm/W,相比于参考器件提高了约71%;器件的最大亮度达到41 570 cd/m2.上述实验结果表明,优化的Cu I:NPB结构有效促进了器件的空穴注入和传输能力,从而降低了驱动电压,提高了发光亮度,改善了功率效率.更多还原

【Abstract】 A key issue of the improvement for optoelectronic performance in organic light-emitting diodes( OLEDs) are the enhancement of hole injection. The improved hole injection can be achieved in phosphorescent green OLED by doping of copper iodide( CuI) in N,N’-bis( naphthalen-1-yl)-N,N’-bis( phenyl)-benzidine( NPB). For the device with CuI: NPB as hole injection layer( HIL),the driving voltage of 6. 44 V at the brightness of 1 000 cd/m2 is 2. 11 V lower than that of the reference device with neat NPB HIL. Moreover,the maximum power efficiency of 7. 7 lm/W increases by about 71% compared to that of the reference device. Additionally,the maximum brightness reaches 41570 cd/m2. This result is ascribed to the utilization of CuI: NPB HIL to facilitate the hole injection and transport from the anode,resulting in the reduction of driving voltage,the increasement of brightness and the improvement of power efficiency.更多还原