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Near-infrared nanophosphors have attracted attention due to their wide application fields, including component analysis, bioimaging, and spectral converters of sunlight for crystalline silicon solar cells (c-Si). Yb3+ ions exhibit near-infrared (NIR) luminescence at around 1000 nm, which is consistent with the first biological window and the maximum responsivity range of c-Si. Therefore, we focused on and successfully synthesized Bi3+/Yb3+-doped NIR luminescence nanophosphors, RE2MoO6:Bi3+,Yb3+ (RE=Gd, Y, and Lu) and Gd2Mo1–xWxO6:Bi3+,Yb3+ (x = 0–0.5), utilizing a solvothermal reaction process. All samples exhibit NIR luminescence of Yb3+ ions under ultra-violet (UV) light excitation and broadband excitation due to the charge transfer transition between the O 2p/Bi 6s and Mo 4d or W 5d orbitals, indicated by their optical properties of photoluminescence (PL), PL excitation (PLE), and reflectance spectra. Furthermore, to evaluate the contribution of the Gd2MoO6:Bi,Yb (GMO:Bi,Yb) nanophosphor to the conversion efficiency of c-Si, a phosphor-converted film was made using dimethylpolysiloxane (PDMS) and the GMO:Bi,Yb nanophosphor. The results showed that the conversion efficiency of c-Si with the PDMS/GMO:Bi,Yb film is higher than that of c-Si with the PDMS-only film. Based on these results, the utilization of down-shifting nanophosphors is able to enhance the conversion efficiency of c-Si, which could be beneficial in addressing future energy challenges.

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Keyword: Absorption, Ions, Luminescence, Optical Properties, Phosphors

Date published: 2024-11-28

Publisher: American Chemical Society (ACS)

Journal:

• The Journal of Physical Chemistry C (ISSN: 19327447) vol. 128 issue. 47 p. 20360-20368

Funding:

• Murata Science Foundation
• Ministry of Education, Culture, Sports, Science and Technology 20H00297
• Ministry of Education, Culture, Sports, Science and Technology 20K15106
• Ministry of Education, Culture, Sports, Science and Technology 22K05264
• Ministry of Education, Culture, Sports, Science and Technology JPMJFS2102

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.jpcc.4c04814

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Updated at: 2024-12-11 16:30:44 +0900

Published on MDR: 2024-12-12 08:30:25 +0900