制备了结构为:ITO/MoO3 (40 nm)/NPB(40 nm)/TCTA(10 nm)/CBP:Ir(ppy)2 acac(x％) (30 nm)/BCP(10 nm)/Alq3 (40 nm)/LiF(1 nm)/Al(100 nm)的器件,Ir(ppy)2acac为绿色磷光染料,x分别为4％、6％、8％、10％.通过调节绿色磷光染料的掺杂浓度,对器件的发光性能进行了研究,发现在掺杂浓度为8％,亮度为490 cd/m2,器件获得最高电流效率为69.43 cd/A,相比4％的器件高出27.5％.分析原因是掺杂浓度越高,载流子在绿色染料上复合的几率越高;CBP与Ir(ppy)2 acac的LUMO能级均为2.5 eV,注入主体CBP上的电子可以直接传递给掺杂染料,避免电子对掺杂染料传递过程中的能量损失;较高的掺杂浓度更有利于载流子的传输.然而,较高的掺杂浓度会引起三线态激子的猝灭效应.另外,由于TCTA、BCP为载流子阻挡材料,具有较高的三线态能量,可以将载流子和激子限制在发光层内.
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