A1 Journal article (refereed)
Thermally activated delayed fluorescence Au‐Ag‐oxo nanoclusters : From photoluminescence to radioluminescence (2024)

Yuan, P., Zhang, H., Zhou, Y., He, T., Malola, S., Gutiérrez‐Arzaluz, L., Li, Y., Deng, G., Dong, C., Huang, R., Song, X., Teo, B. K., Mohammed, O. F., Häkkinen, H., Bakr, O. M., & Zheng, N. (2024). Thermally activated delayed fluorescence Au‐Ag‐oxo nanoclusters : From photoluminescence to radioluminescence. Aggregate, 5(2), Article e475. https://doi.org/10.1002/agt2.475

JYU authors or editors

Publication details

All authors or editors: Yuan, Peng; Zhang, Hansong; Zhou, Yang; He, Tengyue; Malola, Sami; Gutiérrez‐Arzaluz, Luis; Li, Yingwei; Deng, Guocheng; Dong, Chunwei; Huang, Renwu; et al.

Journal or series: Aggregate

ISSN: 2692-4560

eISSN: 2692-4560

Publication year: 2024

Publication date: 04/01/2024

Volume: 5

Issue number: 2

Article number: e475

Publisher: John Wiley & Sons

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1002/agt2.475

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/92777

Abstract

Thermally activated delayed fluorescence (TADF) materials have numerous applications in energy conversion and luminescent imaging. However, they are typically achieved as metal-organic complexes or pure organic molecules. Herein, we report the largest Au-Ag-oxo nanoclusters to date, Au18Ag26(R1COO)12(R2C≡C)24(μ4-O)2(μ3-O)2 (Au18Ag26, where R1 = CH3-, Ph-, CHOPh- or CF3Ph-; R2 = Ph- or FPh-). These nanoclusters exhibit exceptional TADF properties, including a small S1-T1 energy gap of 55.5 meV, a high absolute photoluminescence quantum yield of 86.7%, and a microseconds TADF decay time of 1.6 μs at ambient temperature. Meanwhile, Au18Ag26 shows outstanding stability against oxygen quenching and ambient conditions. Atomic level analysis reveals the strong π⋯π and C-H⋯π interactions from the aromatic alkynyl ligands and the enhancement of metal-oxygen-metal interactions by centrally coordinated O2−. Modeling of the electronic structure shows spatially separated highest occupied molecular orbital and lowest unoccupied molecular orbital, which promote charge transfer from the ligand shell, predominantly carboxylate ligands, to O2−-embedded metal core. Furthermore, TADF Au-Ag-oxo nanoclusters exhibit promising radioluminescence properties, which we demonstrate for X-ray imaging. Our work paves the way for the design of TADF materials based on large metal nanoclusters for light-emission and radioluminescence applications.

Keywords: luminescence; photoluminescence; x-ray examination; fluorescence

Free keywords: Au-Ag-oxo nanoclusters; photoluminescence; radioluminescence; TADF; X-ray imaging

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Ministry reporting: Yes

VIRTA submission year: 2024

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