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Spinel-Type Structured Phosphor Near-Infrared-II Emission: Intervalence Charge Transfer and Hetero-Valent Chromium Pairs.
Huang, Ming-Hsuan; Chen, Kuan-Chun; Majewska, Natalia; Kaminski, Mikolaj; Leniec, Grzegorz; Mijowska, Ewa; Kong Pang, Wei; Peterson, Vanessa K; Cherng, Ding-Hua; Lu, Kuang-Mao; Mahlik, Sebastian; Liu, Ru-Shi.
  • Huang MH; Department of Chemistry, National Taiwan University, 106, Taipei, Taiwan.
  • Chen KC; Department of Chemistry, National Taiwan University, 106, Taipei, Taiwan.
  • Majewska N; Institute of Experimental Physics, Faculty of Mathematics, Physics, and Informatics, University of Gdansk, Wita Stwosza 57, 80-308, Gdansk, Poland.
  • Kaminski M; Institute of Experimental Physics, Faculty of Mathematics, Physics, and Informatics, University of Gdansk, Wita Stwosza 57, 80-308, Gdansk, Poland.
  • Leniec G; Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Piastow Ave. 45, 70-311, Szczecin, Poland.
  • Mijowska E; Center for Advanced Materials and Manufacturing Process Engineering, West Pomeranian University of Technology, 70-310, Szczecin, Poland.
  • Kong Pang W; Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Piastow Ave. 45, 70-311, Szczecin, Poland.
  • Peterson VK; Center for Advanced Materials and Manufacturing Process Engineering, West Pomeranian University of Technology, 70-310, Szczecin, Poland.
  • Cherng DH; Institute for Superconducting and Electronic Materials, Faculty of Engineering, Information and Science, University of Wollongong, Squires Way, 2500, North Wollongong, New South Wales, Australia.
  • Lu KM; Institute for Superconducting and Electronic Materials, Faculty of Engineering, Information and Science, University of Wollongong, Squires Way, 2500, North Wollongong, New South Wales, Australia.
  • Mahlik S; Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, 2232, Sydney, New South Wales, Australia.
  • Liu RS; Everlight Electronics Co., Ltd., 238, New Taipei City, Taiwan.
Angew Chem Int Ed Engl ; : e202412815, 2024 Aug 08.
Article en En | MEDLINE | ID: mdl-39117561
ABSTRACT
Near-infrared (NIR) emitting phosphors draw much attention because they show great applicability and development prospects in many fields. Herein, a series of inverse spinel-type structured LiGa5O8 phosphors with a high concentration of Cr3+ activators is reported with a dual emission band covering NIR-I and II regions. Except for strong ionic exchange interactions such as Cr3+-Cr3+ and Cr3+ clusters, an intervalence charge transfer (IVCT) process between aggregated Cr ion pairs is proposed as the mechanism for the ~1210 nm NIR-II emission. Comprehensive structural and luminescence characterization points to IVCT between two Cr3+ being induced by structural distortion and further enhanced by irradiation. Construction of the configurational energy level diagram enabled elucidation of this transition within the IVCT process. Therefore, this work provides insight into the emission mechanism within the high Cr3+ concentration system, revealing a new design strategy for NIR-II emitting phosphors to promote its response.
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Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2024 Tipo del documento: Article
Texto completo
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Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2024 Tipo del documento: Article