Bright White Organic Light-emitting Device Based on 1,2,3,4,5,6-Hexakis(9,9-diethyl-9H-fluoren-2-yl)benzene

Chemical Research in Chinese Universities ›› 2009, Vol. 25 ›› Issue (4): 590-594.

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Bright White Organic Light-emitting Device Based on 1,2,3,4,5,6-Hexakis(9,9-diethyl-9H-fluoren-2-yl)benzene

MA Tao¹, YU Jun-sheng^1*, LOU Shuang-ling¹, TANG Xiao-qing¹, JIANG Ya-dong¹ and ZHANG Qing^2*

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

Received:2008-01-21 Revised:2008-04-30 Online:2009-07-25 Published:2009-10-16
Contact: YU Jun-sheng. E-mail: jsyu@uestc.edu.cn; ZHANG Qing. E-mail: qz14@sjtu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.60425101 and 20674049), Program for New Century Excellent Talents in Universities of China(Nos.060812) and Young Talent Project of University of Electronic Science and Technology of China(Nos.060206).

Abstract

Abstract:

Organic light-emitting devices(OLEDs) with the structure of indium-tin-oxide(ITO)/N,N′-bis-(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine(NPB)/2,9-dimenthyl-4,7-diphenyl-1,10-phenanthroline(BCP)/tris(8-hydroxyquinoline)aluminum(Alq₃)/Mg:Ag or that of ITO/NPB/1,2,3,4,5,6-hexakis(9,9-diethyl-9H-fluoren-2-yl)benzene(HKEthFLYPh)/Alq₃/Mg:Ag were studied. White light emission was achieved with the two devices when the thicknesses of BCP and HKEthFLYPh were 1.5 nm(device B) and 5 nm (device II), respectively. The obvious difference was that the EL spectrum of device II was not sensitive to the thickness of HKEthFLYPh compared to that of BCP layer. Moreover, the maximum luminance of device II was about 1000 cd/m² higher than that of device B at a forward bias of 15 V, and it exhibited a maximum power efficiency of 1.0 lm/W at 5.5 V, which is nearly twice that of device B. The performance of device II using a novel star-shaped hexafluorenylbenzene organic material was improved compared with that of BCP.

Key words: Organic light-emitting diode; Star-shaped hexafluorenylbenzene; White light; BCP; Energy transfer

MA Tao, YU Jun-sheng*, LOU Shuang-ling, TANG Xiao-qing, JIANG Ya-dong, ....... Bright White Organic Light-emitting Device Based on 1,2,3,4,5,6-Hexakis(9,9-diethyl-9H-fluoren-2-yl)benzene[J]. Chemical Research in Chinese Universities, 2009, 25(4): 590-594.

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Bright White Organic Light-emitting Device Based on 1,2,3,4,5,6-Hexakis(9,9-diethyl-9H-fluoren-2-yl)benzene

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