Steric-Hindrance-Functionalized Polydiarylfluorenes: Conformational Behavior, Stabilized Blue Electroluminescence, and Efficient Amplified Spontaneous Emission

Lubing Bai, Bin Liu, Yamin Han, Mengna Yu, Jiong Wang, Xinwen Zhang, Changjin Ou, Jinyi Lin, Wensai Zhu, Linghai Xie, Chengrong Yin, Jianfeng Zhao, Jianpu Wang, Donal D.C. Bradley, Wei Huang

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32 Scopus citations

Abstract

Control of the hierarchical molecular organization of polydiarylfluorenes by synthetic strategies is significant for optimizing photophysical properties as well as the performance of light-emitting devices. Herein, for the suppression of molecular aggregation and enhancement of luminescence efficiency, a series of steric units were introduced into polydiarylfluorenes by copolymerization, with the aim of integrating the advantages of the steric-hindrance effect and of the β-phase. Optical and Raman spectroscopies revealed a β-phase conformation for a polymer copolymerized with spiro[fluorene-9,9′-xanthene] (SFX), with photoluminescence (PL) peaks at 454, 482, and 517 nm. Moreover, the morphological stability and electroluminescence (EL) stability were also improved without compromising the performance of the polymer light-emitting diodes (PLEDs). Furthermore, three steric-hindrance-functionalized copolymers showed significantly decreased thresholds for amplified spontaneous emission (EthASE) and enhanced stability following thermal annealing treatment. These results indicate that steric-hindrance functionalization is a superior approach to improve the overall stability and optoelectronic properties for blue-light-emitting π-conjugated polymers.
Original languageEnglish (US)
JournalACS Applied Materials and Interfaces
Volume9
Issue number43
DOIs
StatePublished - Nov 1 2017
Externally publishedYes

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