Room-Temperature Delayed Fluorescence of Gold Nanoclusters in Zinc-Mediated Two-Dimensional Crystalline Assembly

Basu, Srestha ; Chattopadhyay, Arun (2019) Room-Temperature Delayed Fluorescence of Gold Nanoclusters in Zinc-Mediated Two-Dimensional Crystalline Assembly Langmuir, 35 (15). pp. 5264-5270. ISSN 0743-7463

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Official URL: http://doi.org/10.1021/acs.langmuir.9b00149

Related URL: http://dx.doi.org/10.1021/acs.langmuir.9b00149

Abstract

We report that complexation-reaction-mediated two-dimensional crystalline assembly of gold (Au14) nanoclusters (NCs) exhibits room-temperature delayed fluorescence at 605 nm, with an unprecedented long lifetime of 0.5 ms and an exceptionally high quantum yield of 19.1 ± 0.9%. Interestingly, the as-synthesized Au NCs had a very weak delayed fluorescence signal. The enhancement in delayed fluorescence of Au NCs upon formation of assembly has been attributed to the crystallization-induced structural rigidity, which restricted the nonradiative transitions and enhanced the excited-state lifetime. The attainment of crystalline organization was substantiated by electron diffraction analysis. A possible structure was established based on experimental results and computational optimizations. Atomic force microscopy revealed the formation of multilayered two-dimensional nanosheets with thickness of 2.44 ± 0.48 nm.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society
ID Code:135483
Deposited On:24 Jan 2023 08:27
Last Modified:24 Jan 2023 08:27

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