Trap-Mediated Sensitization Governs Near-Infrared Emission from Yb 3+ -Doped Mixed-Halide CsPbCl x Br 3- x Perovskite Nanocrystals.

Autor: Tepliakov NV; Department of Materials and The Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, London SW7 2AZ, United Kingdom.; PhysNano Department, ITMO University, Saint-Petersburg 197101, Russia., Sokolova AV; Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR 999077, P. R. China., Tatarinov DA; PhysNano Department, ITMO University, Saint-Petersburg 197101, Russia., Zhang X; Key Laboratory of Automobile Materials MOE, School of Material Science & Engineering, Jilin University, Changchun 130012, P. R. China., Zheng W; Key Laboratory of Automobile Materials MOE, School of Material Science & Engineering, Jilin University, Changchun 130012, P. R. China., Litvin AP; PhysNano Department, ITMO University, Saint-Petersburg 197101, Russia.; Key Laboratory of Automobile Materials MOE, School of Material Science & Engineering, Jilin University, Changchun 130012, P. R. China., Rogach AL; Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR 999077, P. R. China.; Centre for Functional Photonics (CFP), City University of Hong Kong, Hong Kong SAR 999077, P. R. China.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2024 Mar 20; Vol. 24 (11), pp. 3347-3354. Date of Electronic Publication: 2024 Mar 07.
DOI: 10.1021/acs.nanolett.3c04881
Abstrakt: Understanding the photosensitization mechanisms in Yb 3+ -doped perovskite nanocrystals is crucial for developing their anticipated photonic applications. Here, we address this question by investigating near-infrared photoluminescence of Yb 3+ -doped mixed-halide CsPbCl x Br 3- x nanocrystals as a function of temperature and revealing its strong dependence on the stoichiometry of the host perovskite matrix. To explain the observed experimental trends, we developed a theoretical model in which energy transfer from the perovskite matrix to Yb 3+ ions occurs through intermediate trap states situated beneath the conduction band of the host. The developed model provides an excellent agreement with experimental results and is further validated through the measurements of emission saturation at high excitation powers and near-infrared photoluminescence quantum yield as a function of the anion composition. Our findings establish trap-mediated energy transfer as a dominant photosensitization mechanism in Yb 3+ -doped CsPbCl x Br 3- x nanocrystals and open up new ways of engineering their optical properties for light-emitting and light-harvesting applications.
Databáze: MEDLINE
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