期刊
OPTICAL MATERIALS
卷 142, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.optmat.2023.114060
关键词
OH-LSCAS glass; Ce3+-Yb3+luminescence; Quantum cutting; Downconversion; Thermal lens spectrometry
Yb-Ce co-doped LSCAS glasses melted under a vacuum atmosphere exhibit down-conversion luminescence suitable for solar cell application due to the absence of OH- radicals. The absorption spectra show a broad ultraviolet-visible band associated with the 2F5/2, 2F7/2-+ 5d transitions of Ce3+. Time-resolved luminescence confirms energy transfer from Ce3+ to Yb3+, and contour maps spectra reveal a decrease in Ce3+ emission with increasing Yb concentration. Thermal lens results indicate an increase in heat generation and suggest the occurrence of nonradiative transitions involving Yb2+ or Ce4+ ions.
Yb-Ce co-doped LSCAS glasses melted under a vacuum atmosphere are free of OH- radicals presenting down -conversion luminescence of interest for solar cell application. Absorption spectra showed an ultraviolet-visible broad band related to the 2F5/2, 2F7/2-+ 5d transitions of the Ce3+. Time-resolved luminescence evidenced energy transfer from Ce3+ to Yb3+, and the contour maps spectra showed a decrease in Ce3+ emission with the increase of Yb concentration. Thermal lens results evidenced an increase in heat generation, suggesting the occurrence of nonradiative transitions due to the formation of Yb2+ or Ce4+ ions. The observed emissions are attributed to energy transfer from Ce3+ or Yb2+ to two Yb3+ ions by quantum cutting mechanism, emission from Ce3+ at 520 nm, and predominantly, a phonon-assisted energy transfer from Ce3+ or Yb2+ to one Yb3+ ion.
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