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Thermally activated delayed fluorescence in Cu(I) complexes originating from restricted molecular vibrations.

Li, Guangfu and Nobuyasu, Roberto and Zhang, Bao-Hua and Geng, Yun and Yao, Bing and Xie, Zhi-Yuan and Zhu, Dong-Xia and Shan, Guo-Gang and Che, Wei-Long and Yan, Li-Kai and Su, Zhong-Min and Dias, F. B. and Bryce, M. R. (2017) 'Thermally activated delayed fluorescence in Cu(I) complexes originating from restricted molecular vibrations.', Chemistry : a European journal., 23 (49). pp. 11761-11766.

Abstract

The mechanism of thermally activated delayed fluorescence (TADF) in molecules in aggregated or condensed solid states has been rarely studied and is not well understood. Nevertheless, many applications of TADF emitters are strongly affected by their luminescence properties in the aggregated state. In this study, two new isomeric tetradentate Cu(I) complexes which simultaneously show aggregation induced emission (AIE) and TADF characteristics are reported for the first time. We provide direct evidence that effectively restricting the vibrations of individual molecules is a key requisite for TADF in these two Cu(I) complexes through in-depth photophysical measurements combined with kinetic methods, single crystal analysis and theoretical calculations. These findings should stimulate new molecular engineering endeavours in the design of AIE-TADF active materials with highly emissive aggregated states.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/chem.201701862
Publisher statement:© 2017 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date accepted:14 July 2017
Date deposited:26 July 2017
Date of first online publication:10 August 2017
Date first made open access:No date available

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