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

doi:10.1088/1674-1056/19/4/047802

中国物理B ›› 2010, Vol. 19 ›› Issue (4): 47802-047802.doi: 10.1088/1674-1056/19/4/047802

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

张清¹, 曹康丽¹, 张巍², 于军胜², 黄江², 蒋亚东²

(1)Department of Polymer Science, School of Chemistry and Chemical Technology, Shanghai Jiaotong University, Shanghai 200240,China; (2)School of Optoelectronic Information, State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China

收稿日期:2009-07-21 修回日期:2009-10-29 出版日期:2010-04-15 发布日期:2010-04-15
基金资助:
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 Chin

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

Zhang Wei(张巍)^a), Yu Jun-Sheng(于军胜)^a)†, Huang Jiang(黄江)^a), Jiang Ya-Dong(蒋亚东)^a), Zhang Qing(张清)^b), and Cao Kang-Li(曹康丽)^b)

^a School of Optoelectronic Information, State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China; ^b Department of Polymer Science, School of Chemistry and Chemical Technology, Shanghai Jiaotong University, Shanghai 200240,China

Received:2009-07-21 Revised:2009-10-29 Online:2010-04-15 Published:2010-04-15
Supported by:
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 Chin

摘要/Abstract

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.

Abstract: 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.

Key words: exciplex elimination, fluorene derivative, organic light-emitting diode, 4,4'-N, N'-dicarbazole-biphenyl

中图分类号: (Light-emitting devices)

85.60.Jb

85.60.Bt (Optoelectronic device characterization, design, and modeling)

张巍, 于军胜, 黄江, 蒋亚东, 张清, 曹康丽. 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[J]. 中国物理B, 2010, 19(4): 47802-047802.

Zhang Wei(张巍), Yu Jun-Sheng(于军胜), Huang Jiang(黄江), Jiang Ya-Dong(蒋亚东), Zhang Qing(张清), and Cao Kang-Li(曹康丽). 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[J]. Chin. Phys. B, 2010, 19(4): 47802-047802.

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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

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

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