Induced Red Circularly Polarized Luminescence Emission Promoted by Intermolecular Förster Resonance Energy Transfer through a Cholesteric Liquid Crystal Medium

Dan Xu; Xinran Hua; Chao Liu; Jiaxin Luo; Wen-Hua Zheng; Yixiang Cheng

doi:10.1021/acsami.3c04214

Induced Red Circularly Polarized Luminescence Emission Promoted by Intermolecular Förster Resonance Energy Transfer through a Cholesteric Liquid Crystal Medium

ACS Appl Mater Interfaces. 2023 May 31;15(21):25783-25790. doi: 10.1021/acsami.3c04214. Epub 2023 May 18.

Authors

Dan Xu¹, Xinran Hua¹, Chao Liu¹, Jiaxin Luo¹, Wen-Hua Zheng¹, Yixiang Cheng¹

Affiliation

¹ State Key Laboratory of Coordination Chemistry and Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.

PMID: 37199708
DOI: 10.1021/acsami.3c04214

Abstract

In this paper, planar chiral helicenes based on [2.2]paracyclophane PCPH5 acted as both chiral inducers and energy donors to construct the circularly polarized luminescence (CPL)-active ternary cholesteric liquid crystals (T-N*-LCs) in a commercial nematic liquid crystal (SLC1717, N-LCs) medium. Induced red CPL emission based on the energy acceptor of the achiral polymer DTBTF8 could be successfully promoted by the intermolecular Förster resonance energy transfer mechanism. The resulting T-N*-LCs can generate intensive CPL signals with g_lum up to +0.70/-0.67. Interestingly, this kind of "on-off" CPL switching of T-N*-LCs can be manipulated by the applied direct current electric field.

Keywords: Förster resonance energy transfer; [2.2]paracyclophane; cholesteric liquid crystals; circularly polarized luminescence; helicene.