Exciplex elimination in an organic light-emitting diode based on a fluorene derivative by inserting 4,4'-N,N'-dicarbazole-biphenyl into donor/acceptor interface  

作　　者：张巍 于军胜 黄江 蒋亚东 张清 曹康丽 

机构地区：[1]School of Optoelectronic Information,State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China(UESTC) [2]Department of Polymer Science,School of Chemistry and Chemical Technology,Shanghai Jiaotong University

出　　处：《Chinese Physics B》2010年第4期438-444,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.60736005,60876051 and 60425101-1);the Young Talent Project of Sichuan Province of China(Grant No.09ZQ026-074);the Natural Science Foundation of Sichuan Province of China(Grant No.9140A02060609DZ0208);the Program for New Century Excellent Talents in University(Grant No.NCET-06-0812);the Special Research Foundation for Returned Overseas Scholars of the State Education Ministry (Grant No.GGRYJ08-05)

摘　　要：Organic light-emitting diodes （OLEDs） composed of a novel fluorene derivative of 2,3-bis（9,9-dihexyl-9H-fluoren- 2-yl）-6,7-difluoroquinoxaline （F2Py） were fabricated, and exciplex emission was observed in the device. To depress the exciplex in an OLED for pure colour light emission, 4, 4＇-N,N＇-dicarbazole-biphenyl （CBP） was inserted as a separator at the donor/acceptor interface. It was found that the device without the CBP layer emitted a green light peaking at 542 nm from the exciplex and a shoulder peak about 430 nm from F2Py. In contrast, the OLED with CBP layer emitted only a blue light peak at about 432 nm from F2Py. Device efficiencies were calculated by a simulative mode in an injection controlled type mechanism, and the results showed that exciplexes yield much lower quantum efficiency than excitons. The device with CBP has a higher power efficiency as no exciplex was present.Organic light-emitting diodes （OLEDs） composed of a novel fluorene derivative of 2,3-bis（9,9-dihexyl-9H-fluoren- 2-yl）-6,7-difluoroquinoxaline （F2Py） were fabricated, and exciplex emission was observed in the device. To depress the exciplex in an OLED for pure colour light emission, 4, 4＇-N,N＇-dicarbazole-biphenyl （CBP） was inserted as a separator at the donor/acceptor interface. It was found that the device without the CBP layer emitted a green light peaking at 542 nm from the exciplex and a shoulder peak about 430 nm from F2Py. In contrast, the OLED with CBP layer emitted only a blue light peak at about 432 nm from F2Py. Device efficiencies were calculated by a simulative mode in an injection controlled type mechanism, and the results showed that exciplexes yield much lower quantum efficiency than excitons. The device with CBP has a higher power efficiency as no exciplex was present.

关 键 词：exciplex elimination fluorene derivative organic light-emitting diode 4 4＇-N N＇-dicarbazole-biphenyl 

分 类 号：TN312.8[电子电信—物理电子学] TN383.1