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Chin. Phys. B, 2010, Vol. 19(4): 047802    DOI: 10.1088/1674-1056/19/4/047802
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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
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.
Keywords:  exciplex elimination      fluorene derivative      organic light-emitting diode      4,4'-N      N'-dicarbazole-biphenyl  
Received:  21 July 2009      Revised:  29 October 2009      Accepted manuscript online: 
PACS:  85.60.Jb (Light-emitting devices)  
  85.60.Bt (Optoelectronic device characterization, design, and modeling)  
Fund: 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

Cite this article: 

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 2010 Chin. Phys. B 19 047802

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