Issue 34, 2008

Solution-processable highly efficient yellow- and red-emitting phosphorescent organic light emitting devices from a small molecule bipolar host and iridium complexes

Abstract

A bipolar transport compound, 2,5-bis(4-(9-(2-ethylhexyl)-9H-carbazol-3-yl)phenyl)-1,3,4-oxadiazole (CzOXD), incorporating both electron- and hole-transport functionalities, was synthesized and fully characterized by 1H NMR, 13C NMR, elemental analysis and mass spectrometry. Its thermal, electrochemical, electronic absorption and photoluminescent properties were studied. The atomic force microscopy images indicate that smooth and homogeneous films can be obtained by spin-coating from a chloroform solution of CzOXD/iridium complex blends. Highly efficient small-molecule-based organic light emitting devices were fabricated by a wet process. With the device structure of ITO/PEDOT:PSS/Ir complex : CzOXD/BCP/Alq3/LiF/Al, a maximum luminance of 15232 cd m−2 and current efficiency of 20 cd A−1 for a yellow-emitting OLED, and 4896 cd m−2, 4.6 cd A−1 for a red-emitting OLED were achieved under ambient conditions.

Graphical abstract: Solution-processable highly efficient yellow- and red-emitting phosphorescent organic light emitting devices from a small molecule bipolar host and iridium complexes

Supplementary files

Article information

Article type
Paper
Submitted
14 Apr 2008
Accepted
06 Jun 2008
First published
21 Jul 2008

J. Mater. Chem., 2008,18, 4091-4096

Solution-processable highly efficient yellow- and red-emitting phosphorescent organic light emitting devices from a small molecule bipolar host and iridium complexes

Y. Tao, Q. Wang, C. Yang, K. Zhang, Q. Wang, T. Zou, J. Qin and D. Ma, J. Mater. Chem., 2008, 18, 4091 DOI: 10.1039/B806306K

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