Organic Composite Crystal with Persistent Room-Temperature Luminescence Above 650 nm by Combining Triplet-Triplet Energy Transfer with Thermally Activated Delayed Fluorescence



Wang, Jian-Xin, Zhang, Han, Niu, Li-Ya, Zhu, Xin, Kang, Yan-Fei, Boulatov, Roman ORCID: 0000-0002-7601-4279 and Yang, Qing-Zheng
(2020) Organic Composite Crystal with Persistent Room-Temperature Luminescence Above 650 nm by Combining Triplet-Triplet Energy Transfer with Thermally Activated Delayed Fluorescence. CCS CHEMISTRY, 2 (5). pp. 1391-1398.

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Abstract

Structural modifications are a successful and commonly used approach to tune the emission properties of diverse fluorophores, but extending this approach to heavy-atom-free persistent luminophores has so far been unsuccessful. Here we employed a novel strategy to demonstrate triplet-triplet energy transfer from an organic room-temperature phosphor (RTP) with persistent luminescence to an organic molecule with thermally activated delayed fluorescence (TADF). We illustrated this approach by preparing heavy-atom-free composite crystals of an RTP with a long-lifetime emission and a red emissive organic fluorophore with TADF to yield materials with emission above 650 nm. The emission arose from the triplet excited state of an acceptor undergoing thermally activated reverse intersystem crossing (RISC) to the emissive S1 state. Such composite crystal is the first organic material with persistent TADF, achieved by triplet-triplet energy transfer.

Item Type: Article
Uncontrolled Keywords: heavy-atom-free RTP, persistent luminescence, TADF, energy transfer, Anti-counterfeiting
Depositing User: Symplectic Admin
Date Deposited: 02 Sep 2020 09:35
Last Modified: 14 Mar 2024 20:03
DOI: 10.31635/ccschem.020.202000158
Open Access URL: https://doi.org/10.31635/ccschem.020.202000158
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3099589