Journal
JOURNAL OF LUMINESCENCE
Volume 226, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2020.117512
Keywords
Photoluminescence; Down-conversion; Near-infrared; Energy transfer; Gallo-germanate
Categories
Funding
- Natural Science Foundation of China [61308092, 21590803]
- Natural Science Foundation of Liaoning Province [2019MS320]
- Youth Innovation Promotion Association of CAS [2017230]
- Dalian Science & Technology Star Program [2017RQ116]
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Rare earth ions are efficient candidates for converting solar photons to suitable counterparts that are available for the commercially Si-based photovoltaic solar cells, which are often enabled in glasses and glass ceramics (GCs). Herein, Pr3+-Yb3+ ions co-doped 65GeO(2)-15Ga(2)O(3)-10BaO-10LaF(3) glasses were studied and corresponding GCs were obtained by heat treatment under different temperature-time conditions. Gallo-germanium oxide nanocrystals (NCs) precipitation has been confirmed by X-ray diffraction and scanning electron microscopy. Excitation and emission spectra, as well as lifetime decay curves of all glasses and GCs were recorded in the visible and near-infrared region. Energy transfer efficiencies and quantum yields were calculated according to the spectra. The results show that the glass has excellent energy conversion characteristics with a maximum 20.2% quantum yield in near-infrared down-conversion emission and the quantum yield has been enhanced to 38.9% in GCs. Results suggest that the near-infrared emission efficiency could be significantly enhanced by NCs crystallization process and the studied system had potential applications in energy conversion for Si-based solar cells.
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