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Research Article

Water-soluble boron carbon oxynitride dots with excellent solid-state fluorescence and ultralong room-temperature phosphorescence

Shenghui Han1, Gang Lian1( ), Xiaoliang Zeng2, Zhaozhen Cao3, Qilong Wang3, Deliang Cui1, Ching-Ping Wong4( )
State Key Lab of Crystal Materials, Shandong University, Jinan 250100, China
Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
Key Laboratory for Special Functional Aggregated Materials of Education Ministry, School of Chemistry & Chemical Engineering, Shandong University, Jinan 250100, China
School of Materials Science and Engineering, Georgia Institute of Technology, Georgia 30332, USA
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Abstract

Developing metal-free and long lifetime room-temperature phosphorescence (RTP) materials has received tremendous interest due to their numerous potential applications, of which stable triplet-excited state is the core challenge. Here, boron carbon oxynitride (BCNO) dots, emitting stable blue fluorescence and green RTP, are reported for the first time. The obtained BCNO dots exhibit an unexpected ultralong RTP lifetime of 1.57 s, lasting over 8 s to naked eyes. The effective doping of carbon and oxygen elements in boron nitride (BN) actually provides a small energy gap between singlet and triplet states, facilitating the intersystem crossing (ISC) and populating of triplet excitons. The formation of compact cores via crystallization and effective inter-/intra-dot hydrogen bonds further stabilizes the excited triplet states and reduces quenching of RTP by oxygen at room temperature. Based on the water-soluble feature of BCNO dots, a novel advanced security ink is developed toward anti-counterfeiting tag and confidential information encryption. This study extends BCNO dots to rarely exploited phosphorescence fields and also provides a facile strategy to prepare ultralong lifetime metal-free RTP materials.

Keywords

boron carbon oxynitride dotsroom-temperature phosphorescencefluorescencecolourless security inkanti-counterfeiting

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Nano Research
Volume 13 Issue 12,
December 2020
Pages 3261-3267
DOI: 10.1007/s12274-020-2999-y
Cite this article:
Han S, Lian G, Zeng X, et al. Water-soluble boron carbon oxynitride dots with excellent solid-state fluorescence and ultralong room-temperature phosphorescence. Nano Research, 2020, 13(12): 3261-3267. https://doi.org/10.1007/s12274-020-2999-y
Topics:
FluorescenceHydrogen bonds IIINitridesPhosphorescenceVI semiconductors

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Received: 25 March 2020
Revised: 17 July 2020
Accepted: 20 July 2020
Published: 22 August 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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