主体材料对蓝色磷光有机电致发光器件的影响

Effectiveness of Hosts in Blue Phosphorescent Organic Light-emitting Diodes

采用空穴传输材料4,4',4″-Tris(carbazol-9-yl)triphenylamine(TcTa)和电子传输材料1,3,5-tri[(3-pyridyl)-phen-3-yl]benzene(TmPyPB)分别作为器件的发光层主体,蓝色磷光染料bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium III(Firpic)为客体,制备了蓝色磷光有机电致发光器件,研究了Firpic掺入不同主体材料对器件光电性能的影响.由于发光层相对平衡的载流子注入和传输,使TcTa为主体的器件表现出较优的光电性能.器件的最大发光亮度为5 536 cd/m^2,最大电流效率和功率效率分别为12.8 cd/A和8.0 lm/W.

Two different types of blue electrophosphorescent organic light-emitting diodes （OLEDs） were demonstrated with the emissive layer of bis （ 3,5-difluoro-2-（2-pyridyl） phenyl-（ 2-carboxypyridyl ） iridium III （Firpic） doped into the various host materials. The host material consisted of either hole-transport-type host material, 4,4＇,4＂ -Tris （carbazol-9-yl） triphenylamine （TcTa） or electron-transport-type host material, 1,3,5- tri （m-pyrid-3-yl-phenyl）benzene ） （TmPyPB）. The device with TcTa host exhibited higher photoelectric performance than that one of TmPyPB host. The maximum luminance, current efficiency and power efficiency reached 5 536 cd/m2, 12.8 cd/A and 8.0 lm/W, respectively. The difference in performance of OLED with TcTa host was due to the improvement of the charge carrier injection and transport balance in the emissive layer.