Negative thermal quenching of photoluminescence in a copper–organic framework emitter

Ting Wu; Shenlong Jiang; Pabitra Narayan Samanta; Yangbin Xie; Jipeng Li; Xiaoling Wang; Majumdar Devashis; Xiangwei Gu; Yusong Wang; Wei Huang; Qun Zhang; Jerzy Leszczynski; Dayu Wu

doi:10.1039/D0CC04788K

Negative thermal quenching of photoluminescence in a copper–organic framework emitter†

Ting Wu,‡^a Shenlong Jiang,‡^b Pabitra Narayan Samanta,

‡^c Yangbin Xie,^a Jipeng Li,^a Xiaoling Wang,^a Majumdar Devashis,^c Xiangwei Gu,^a Yusong Wang,^b Wei Huang,^a Qun Zhang,

*^b Jerzy Leszczynski

*^c and Dayu Wu

*^a

Author affiliations

* Corresponding authors

^a Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis & Green Manufacturing Collaborative Innovation Center, School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, P. R. China
E-mail: wudy@cczu.edu.cn

^b Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
E-mail: qunzh@ustc.edu.cn

^c Interdisciplinary Center for Nanotoxicity, Department of Chemistry and Biochemistry, Jackson State University, USA
E-mail: jerzy@icnanotox.org

Abstract

Negative thermal quenching (NTQ), an abnormal phenomenon that the intensity of photoluminescence (PL) increases with increasing temperature, has essentially been restricted to either bulk semiconductors or very low temperatures. Here, we report a delayed fluorescence copper–organic framework exhibiting negative thermal quenching (NTQ) of photoluminescence, which is driven by the fluctuation between the localized and delocalized form of its imidazole ligand. The process is completely reversible on cooling/heating cycles. This study opens a new avenue to explore the electronically switchable NTQ effect in coordination networks and further to develop the NTQ-based light-emitting diodes.

Chemical Communications

Negative thermal quenching of photoluminescence in a copper–organic framework emitter†

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Negative thermal quenching of photoluminescence in a copper–organic framework emitter

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