Formation Mechanism and Excitonic Luminescence of Supercritical-Fluid-Synthesized ZnO Nanoparticles
| Autor: | Brian Dusolle, Véronique Jubera, Evgeniy S. Ilin, Patrick Martin, Gilles Philippot, Matthew R. Suchomel, Bo B. Iversen, Samuel Marre, Cyril Aymonier |
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| Přispěvatelé: | Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Lasers Intenses et Applications (CELIA), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Center for Integrated Materials Research, Aarhus University [Aarhus], Interdisciplinary Nanoscience Center (iNANO), The CNRS and the Nouvelle Aquitaine region. This study was performed with financial support from the French State, managed by the French National Research Agency (ANR) in the frame of a nonthematic program (ANR-2010-BLANC-0820) and in the frame of 'the Investments for the future' Program IDEX Bordeaux - LAPHIA (ANR-10-IDEX-03-02). The Villum Foundation is thanked for support. We gratefully acknowledge DESY (Hamburg, Germany), a member of the Helmholz Association HGF, for granting beamtime at PETRA-III. The LIGHT S&T Graduate Program (PIA3 Investment for the Future Program, ANR-17-EURE-0027)., ANR-10-IDEX-0302,ANR-10-IDEX-03-02,Investments for the Future Programme IdEx Bordeaux-LAPHIA, ANR-17-EURE-0027,LIGHTS&T,University of Bordeaux Graduate Scholl in Light Sciences & Technologies(2017) |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Chemistry of Materials Chemistry of Materials, 2023, 35 (10), pp.4057-4067. ⟨10.1021/acs.chemmater.3c00493⟩ |
| ISSN: | 1520-5002 0897-4756 |
| Popis: | International audience; Extensive research on nanosized ZnO has proven that its optical properties are challenging to control due to a number of possible defects producing various emissions in the visible range. Our group proposed a low-temperature, supercritical-fluid-driven synthesis of isotropic nanosized particles that exhibit a unique and unprecedentedly pure excitonic emission, comparable to that of single crystals. The present article reports the growth mechanism at the origin of the unexpectedly pure excitonic emission as well as a more detailed study of its optical properties at liquid helium temperatures. The ZnO phase is obtained via the thermal decomposition of an intermediate ZnO2 phase. No bulk defect luminescence is detected, and the synthesis route leaves a “ZnO2-like” surface able to neutralize the formation of surface defects, which can contribute to visible emissions. The luminescence measurements were performed at liquid helium temperature to enable the identification of excitons. The investigation of the photoluminescence properties confirms a strong excitonic emission in the UV region with no visible band and sheds light on a phonon coupling with the E2 high vibrational mode. |
| Databáze: | OpenAIRE |
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