Issue 10, 2010

Morphologically and electrochemically stable bipolar host for efficient green electrophosphorescence

Abstract

A new host tBu-o-CzOXD is facilely synthesized through a simple aromatic nucleophilic substitution reaction between 3,6-di-tert-butyl-9H-carbazole and 2,5-bis(2-fluorophenyl)-1,3,4-oxadiazole. Its thermal, electrochemical, electronic absorption and photoluminescent properties are fully investigated. A high glass transition temperature (Tg) of 149 °C is observed for tBu-o-CzOXD due to the introduction of bulky tert-butyl moiety, significantly higher than 97 °C of o-CzOXD without tert-butyl substituent. Moreover, encapsulation of tert-butyl on the 3- and 6-positions of carbazole greatly enhances the electrochemical stability as compared to o-CzOXD. Green phosphorescent OLEDs hosted by tBu-o-CzOXD show a maximum luminance of 48293 cd m−2 at 17.1 V, a maximum current efficiency of 38.4 cd A−1 and a maximum power efficiency of 34.7 lm W−1. Furthermore, the devices exhibit a slow current efficiency roll-off. The device merits, together with the excellent morphological and electrochemical stability, make the new compound an ideal host material for phosphorescent emitters.

Graphical abstract: Morphologically and electrochemically stable bipolar host for efficient green electrophosphorescence

Article information

Article type
Paper
Submitted
22 Oct 2009
Accepted
21 Dec 2009
First published
22 Jan 2010

Phys. Chem. Chem. Phys., 2010,12, 2438-2442

Morphologically and electrochemically stable bipolar host for efficient green electrophosphorescence

Y. Tao, S. Gong, Q. Wang, C. Zhong, C. Yang, J. Qin and D. Ma, Phys. Chem. Chem. Phys., 2010, 12, 2438 DOI: 10.1039/B922110G

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