菲咯啉铜(Ⅰ)配合物的红光有机电致磷光器件

Phosphorescent Organic Light-Emitting Diodes Based on a Red Cu(Ⅰ) Complex

考察了红光Cu(Ⅰ)配合物[Cu(dbp)(dmp)](BF4)(dbp:2,9-二叔丁基-1,10-菲咯啉;dmp:2,9-二甲基-1,10-菲咯啉)的光致发光(PL)和电致发光(EL)性能。将质量分数为20%的配合物掺杂于聚甲基丙烯酸甲酯(PMMA)薄膜中,配合物的最大发射在617 nm,PL效率约为5%,磷光寿命为1.7μs。将质量分数为10%的配合物搀杂于聚乙烯基咔唑(PVK)主体材料中,制备的多层器件的光谱同配合物在PMMA薄膜中光致发光光谱基本一致,能达到631 cd/m2的最大亮度和0.9 cd/A的最大电流效率。器件在高电流密度下的三重态-三重态淬灭不严重,这与该Cu(Ⅰ)配合物的磷光寿命较短有关。

The photoluminescence and electroluminescence properties of red Cu （ Ⅰ ） complex [ Cu （dbp） （drop） ] （ BF4 ） （ dbp = 2,9-Di-tert-butyl-1,10-phenanthroline ; dmp = 2,9-Dimethyl-1,10-phenanthroline） were studied. The film of 20% Cu （ Ⅰ ） complex in PMMA exhibited a photoluminescence quantum yield of 5% with emission maximum at 617 nm. A short excited-state lifetime of 1.7 μs was also observed. Phosphorescent OLEDs with red emission identical to photoluminescence spectrum of the complex in PMMA film were fabricated by using poly （ vinyl carbazole） （PVK） as host. A current efficiency of 0. 9 cd/A along with a maximum brightness up to 631 cd/m^2 was demonstrated. The triplet-triplet（T-T） annihilation under a high current density was not significant for these devices and might be attributed to the short excited-state lifetime of the complex.