Visible and Near-Infrared Emission in Ba3Sc4O9:Bi Phosphor: An Investigation on Bismuth Valence Modification

Yuanyuan Li; Puxian Xiong; Gaochao Liu; Mingying Peng; Zhijun Ma

doi:10.1021/acs.inorgchem.1c01835

Visible and Near-Infrared Emission in Ba₃Sc₄O₉:Bi Phosphor: An Investigation on Bismuth Valence Modification

Inorg Chem. 2021 Sep 6;60(17):13510-13516. doi: 10.1021/acs.inorgchem.1c01835. Epub 2021 Aug 25.

Authors

Yuanyuan Li¹, Puxian Xiong², Gaochao Liu¹, Mingying Peng¹, Zhijun Ma¹

Affiliations

¹ The China-Germany Research Center for Photonic Materials and Devices, The State Key Laboratory of Luminescent Materials and Devices, and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, The School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China.
² School of Physics and Optoelectronic, The State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510640, P. R. China.

PMID: 34432452
DOI: 10.1021/acs.inorgchem.1c01835

Abstract

Bismuth (Bi)-activated luminescence materials have attracted much attention for their tunable broad emissions ranging from a visible to near-infrared (NIR) region. However, it remains a challenge to regulate the Bi valence state and achieve NIR emission via a facile way. Here, we report the design and preparation of Ba₃Sc₄O₉:Bi phosphors, which emit visible and NIR emissions simultaneously even prepared in the air condition. The self-reduction mechanism of Bi³⁺ species in Ba₃Sc₄O₉ with a rigid crystal structure is illustrated based on the charge compensation model, and the coexistence of different Bi-active centers, Bi³⁺ for visible emission, while Bi⁺ and Bi⁰ for NIR emission, is confirmed by the spectroscopic data and X-ray photoelectron spectroscopy (XPS) analysis. The enhanced NIR emission was further achieved through controlled reducing treatment and the related mechanism has also been clarified. This work paves a new way to control bismuth valence and tune the emission of Bi-based luminescence materials for emerging photonics applications.