Soon Ok Jeon et al 2009 J. Phys. D: Appl. Phys. 42 225103 doi:10.1088/0022-3727/42/22/225103
Soon Ok Jeon, Kyoung Soo Yook, Chul Woong Joo and Jun Yeob Lee1
Show affiliationsSimple high efficiency red phosphorescent organic light-emitting diodes (PHOLEDs) without any electron injection layer were developed using a phosphine oxide derivative as a triplet host and electron transport material. Electrons could be directly injected from the Al cathode to the phosphine oxide type material. A high quantum efficiency of 12.5% and a high power efficiency of 12.7 lm W−1 were achieved in the red PHOLEDs without any electron injection layer. In addition, the red PHOLED without any electron transport and electron injection layer also showed a high quantum efficiency of 10.5% and a power efficiency of 10.2 lm W−1.
Issue 22 (21 November 2009)
Received 14 July 2009, in final form 28 September 2009
Published 27 October 2009
Soon Ok Jeon et al 2009 J. Phys. D: Appl. Phys. 42 225103
A Longo et al 2007 Nanotechnology 18 365701
Elena Aprile and Stefano Profumo 2009 New J. Phys. 11 105002
Beibei Zeng et al 2009 J. Opt. A: Pure Appl. Opt. 11 125003
Y Y Huang et al 2009 J. Phys.: Conf. Ser. 188 012014
Victor Matveev and Robert Shrock 2008 J. Phys. A: Math. Theor. 41 135002
D L Sales et al 2007 Nanotechnology 18 475503
A S Alexandrov 2007 J. Phys.: Condens. Matter 19 125216
Huan-Qiang Zhou et al 2008 J. Phys. A: Math. Theor. 41 492002
S Napolitano and M Wübbenhorst 2007 J. Phys.: Condens. Matter 19 205121