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Utilizing morpholine for purely organic room temperature phosphors

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Abstract

In this article, morpholine, a non-conjugated heterocycle, is embedded into π system to construct single-component organic room temperature phosphorescence (RTP) luminogens. The effect of morpholine on intermolecular interaction, crystal packing modes, and RTP performance is investigated systematically. The experimental and theoretical calculation results illustrate the versatility of morpholine in promoting the n-π* transition and intensifying the intermolecular interactions, which not only enhances the generation of triplet excitons, but also suppresses the nonradiative decay of triplet excitons. Impressively, TMPh containing three morpholine units shows an ultralong lifetime of 1.03 s and a visible afterglow up to 10 s. The unique dual delayed emission and long afterglow property allow potential application of morpholine derivatives in data encryption, and the time-dependent color change of afterglow emission is realized after removing the excitation source, providing a high-level data security. This article provides a new perspective for the design of purely organic RTP system without utilization of metal, or even any heavy atoms.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (22075100), the Jilin Provincial Science and Technology Department (20220201082GX) and the Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology, 2021-skllmd).

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Authors and Affiliations

  1. State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Jilin University, Changchun, 130012, China

    Dongyan Jiang, Tong Lu, Chunya Du, Futong Liu, Zhenyu Yan, Anqi Shang, Lei Gao & Ping Lu

  2. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China

    Dehua Hu & Yuguang Ma

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  1. Dongyan Jiang
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  2. Tong Lu
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Correspondence to Ping Lu.

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The supporting information is available online at chem.scichina.com and link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Jiang, D., Lu, T., Du, C. et al. Utilizing morpholine for purely organic room temperature phosphors. Sci. China Chem. 66, 1132–1138 (2023). https://doi.org/10.1007/s11426-022-1507-2

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