Synthesis and properties of hyperbranched polymers for white polymer light-emitting diodes

Xuefeng Li; Haocheng Zhao; Long Gao; Xiaoling Xie; Weixuan Zhang; Mixue Wang; Yuling Wu; Yanqin Miao; Hua Wang; Bingshe Xu

doi:10.1039/C9RA07371J

Synthesis and properties of hyperbranched polymers for white polymer light-emitting diodes†

Xuefeng Li,

^ab Haocheng Zhao,^cd Long Gao,^b Xiaoling Xie,*^a Weixuan Zhang,^ab Mixue Wang,^b Yuling Wu,

*^b Yanqin Miao,

^b Hua Wang^b and Bingshe Xu^b

Author affiliations

* Corresponding authors

^a College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
E-mail: xiexiaoling@tyut.edu.cn

^b Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan, China
E-mail: wuyuling@tyut.edu.cn

^c Department of Electrical Engineering, Shanxi Institute of Energy, Taiyuan 030600, China

^d College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

Abstract

In this work, a series of hyperbranched copolymers with fluorene-alt-carbazole as the branches, three-dimensional-structured spiro[3.3]heptane-2,6-dispirofluorene (SDF) as the core, and iridium 1-(4-bromophenyl)-isoquinoline (acetylacetone) (Ir(Brpiq)₂acac) as the dimming group were synthesized by one-pot Suzuki polycondensation for white emission. All copolymers show great thermal stabilities and high hole-transporting ability due to the introduction of the carbazole unit. The hyperbranched structures for copolymers can suppress the interchain interactions efficiently, and help to form amorphous films. The fabricated polymer light-emitting devices (PLEDs) based on the above synthesized copolymers realize good white light emission, and achieve high electroluminescence (EL) performance. For example, for the optimized PLED, the maximum luminance and current efficiency reach 6210 cd m⁻² and 6.30 cd A⁻¹, respectively, indicating the synthesized hyperbranched copolymers have potential application in solution-processable white polymer light-emitting diodes.

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Synthesis and properties of hyperbranched polymers for white polymer light-emitting diodes†

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Synthesis and properties of hyperbranched polymers for white polymer light-emitting diodes

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