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Dimerization Effect of Fluorene-Based Semiconductors on Conformational Planarization for Microcrystal Lasing

Abstract

Dimerization with a flexible rotation bonding between repeat monomers is an effective platform to clarify the structure-property relationship for the potential optoelectronic applications of organic semiconductors. Herein, four diarylfluorene dimers have been designed and synthesized to investigate conformational behaviors and their effect on the photophysical processing. Surprisingly, all the dimers adopt fully planar and trans conformation with a torsion angle of 180o, indicating the steric bulks in bifluorenes could not disrupt the forming ability of coplanar conformation (also called β phase in polyfluorenes). These results also suggest that alkyl side chains are not a necessary condition to induce conformation planarization in fluorene-based semiconductors. In addition, large spectral redshift in absorption (more than 30 nm) but similar photo-excited processing between pristine amorphous and annealed films of BSBF and DSFXSO clearly indicate that excited-state conformational planarization determines the luminescent properties in amorphous films. Finally, the regularly shaped microcrystals of BDPhF and BSBF show ultraviolet lasing with a threshold of 46.5 and 134.8 W/cm2, respectively, further confirming these dimers can serve as efficient gain media for organic microlasers.

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Publication details

The article was received on 14 Feb 2017, accepted on 12 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7TC00675F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Dimerization Effect of Fluorene-Based Semiconductors on Conformational Planarization for Microcrystal Lasing

    C. Ou, C. Zhu, X. Ding, L. Yang, J. Lin, L. Xie, Y. Qian, C. Xu, J. ZHAO and W. Huang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC00675F

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