Suppression of Nonradiative Decay in TADF Emitters via a Macrocyclic Strategy: An Experimental Study

Xin Xie; Teng Gao; Shaogang Shen; Zhi Pang; Yuanyuan Qin; Xinyi Lv; Ying Wang

doi:10.1021/acs.orglett.4c04202

Suppression of Nonradiative Decay in TADF Emitters via a Macrocyclic Strategy: An Experimental Study

Org Lett. 2024 Dec 24. doi: 10.1021/acs.orglett.4c04202. Online ahead of print.

Authors

Xin Xie^{1

2}, Teng Gao^{1

2}, Shaogang Shen^{1

2}, Zhi Pang^{1

2}, Yuanyuan Qin^{1

2}, Xinyi Lv^{1

2}, Ying Wang^{1

2}

Affiliations

¹ Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
² University of Chinese Academy of Sciences, Beijing 100049, China.

PMID: 39719026
DOI: 10.1021/acs.orglett.4c04202

Abstract

To experimentally investigate the impact of macrocyclic structures on the nonradiative decay rate constants (k_nr^s) of thermally activated delayed fluorescence (TADF), a macrocyclic molecule L-ring and its analogue NL-ring were designed and synthesized. The photophysical measurements reveal their TADF characteristics, and the k_nr^s of the L-ring (4.19 × 10⁶ s^-1) is slower than that of the NL-ring (1.96 × 10⁷ s^-1), endowing the L-ring with a photoluminescence quantum yield of 92.00%. Therefore, the L-ring device exhibited a high external quantum efficiency of 25.61%.