基于三(2-苯基吡啶)合铱的磷光器件性能优化

The performances optimum of organic phosphorescent devices based on tris(2-phenyl pyridine) Iridium

实验中制备了两种不同结构的有机电致发光器件,其一是基于三羟基喹啉铝[AlQ]的荧光发光器件:ITO/NPB(50nm)/AlQ(50nm)/Mg:Ag(100nm,10:1)/Ag(10nm);另一种为基于三(2-苯基吡啶)合铱[Ir(ppy)3]的磷光发光器件:ITO/NPB(40nm)/Ir(ppy)3:CBP(30nm,1:10)/TPBi(15nm)/AlQ(50nm)/Mg:Ag(150nm,10:1)/Ag(10nm)。测试了AlQ光谱吸收性质和器件的I-V-L特性。实验证明磷光器件的效率远高于荧光器件。在磷光器件中引入空穴阻挡层(TPBi)后,器件效率与之前文献所报道的未引入空穴阻挡层器件相比有了极大提高,主要原因为TPBI有效阻止激子扩散远离发光层,减少了电子传输层Al Q的发光。

Two organic light-emitting devices are fabricated with different structures： one based on the tris-（8- hydroxyquinoline）alu-minum is the fluorescent OLED with ITO/NPB（S0nm）/AIQ（50nm）/Mg：Ag（100nm,10：l）/Ag（lOnm） structure;the other based on the tris（2-phenyl pyridine） iridium is the electro-phosphorus OLED with ITO/NPB（40nm）/ Ir（ppy）3：CBP（30nm, l：10）/TPBi（15nm/AlQ（50nm）/Mg：Ag（150nm,10：1）/Ag（10nm）structure.The experiment shows that the efficiency of the electro-phosphorus OLED is far more higher than the efficiency of fluorescent OLED.Due to the introduction of the hole blocking layer CTPBi）,the efficiency of the electro-phosphorus has significantly improved compared to the devices without the hole blocking layer which was reported by the former literature. The main reason is the hole blocking layer（TPBi） effectively prevents excition diffusion away from the luminescent layer and reduces the proportion of the fluorescence radiation from the electron transporting layer（ALQ）.