Synthesis and Electroluminescent Properties of Hyperbranched Light-emitting Polymers with Iridium Complex as Core and 3,6-Carbazole as Branch

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (7): 1480.

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Synthesis and Electroluminescent Properties of Hyperbranched Light-emitting Polymers with Iridium Complex as Core and 3,6-Carbazole as Branch

YING Lei, WANG Lei, ZHANG An-Qi, XU Yun-Hua, YANG Wei*, CAO Yong

Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Special Functional Materials of Ministry of Education, South China University of Technology, Guangzhou 510640, China

Received:2008-11-04 Online:2010-07-10 Published:2010-07-10
Contact: YANG Wei. E-mail: pswyang@scut.edu.cn
Supported by:
国家“九七三”计划项目(批准号: 2009CB623601)和国家自然科学基金(批准号: 20574021, U0634003)资助.

Abstract

Abstract:

Hyperbranched electrophosphorescent polymers, which had a core of iridium complex, 3,6-carba-zole as branch, were synthesized by Suzuki polycondensation. The photoluminance quantum efficiency of the PCzIrMppy3 polymer was 62%, and the HOMO energy levels of the resulted polymers was -5.22 eV, respectively, which was very close to the anode ITO/PEDOT∶PSS of -5.20 eV, suggesting their excellent hole inject property. The green electrophosphorescent light-emitting device based on PCzIrMppy3 polymer with structure of ITO/PEDOT∶PSS/Emissive layer/CsF/Al achieved maximal luminous efficiency of 10.4 cd/A and maximal luminance of 34758 cd/m². Besides, the device performance was isolated with respect to current density, which indicated that this kind of hyper-branched molecular structure was quite favorable for reducing triplet annihilation of electrophosphorescent copolymers at high current density.

Key words: Iridium complex; 3,6-Carbazole; Hyperbranched polymer; Green light-emission

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YING Lei, WANG Lei, ZHANG An-Qi, XU Yun-Hua, YANG Wei*, CAO Yong. Synthesis and Electroluminescent Properties of Hyperbranched Light-emitting Polymers with Iridium Complex as Core and 3,6-Carbazole as Branch[J]. Chem. J. Chinese Universities, 2010, 31(7): 1480.

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Synthesis and Electroluminescent Properties of Hyperbranched Light-emitting Polymers with Iridium Complex as Core and 3,6-Carbazole as Branch

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