We synthesized PrF3-doped glass phosphors using a melt-quenching method and investigated the luminescence characteristic aiming at a new near-infrared wideband light-source. Optical activation of Pr3+ ions in the samples was confirmed by absorption spectra measurements. Broad PL spectra from 700 to 1100 nm with four PL peaks 730, 870, 930, and 1040 nm were observed by blue LED excitation in all samples. The observed PL peaks were attributed to 3P0 → 3F4, 1D2 → 3F2, 3P0 → 1G4, and 1D2 → 3F4 transitions of Pr3+ ions. With the increase in the PrF3 concentration, the integrated PL intensity around 1040 nm (1D2 → 3F4) was sharply decreased compared to the other PL peaks. We investigated the contribution of self-absorption and cross-relaxation phenomena to the spectral change by measuring glass thickness dependence of the PL spectra and measuring the PrF3 concentration dependence of the fluorescence lifetimes. The fluorescence lifetime of the PL peak at 1040 nm decreased with increasing PrF3 concentration owing to a non-radiative relaxation pathway stemming from the cross-relaxation phenomena. We found that the cross-relaxation phenomenon is a dominant factor in the luminescence properties of PrF3-doped glass phosphors.
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This work was supported in part by the Nippon Sheet Glass Foundation for Materials Science and Engineering. This work was partially supported by Aoyama Gakuin University research grant “Early Eagle”. This research was supported by JSPS KAKENHI (Grant No. JP18K13995).
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Nishimura, S., Isobe, E., Nanai, Y. et al. Luminescence properties of PrF3-doped Sb2O3–ZnO–GeO2 glass phosphors for near-infrared wideband light-source. J Mater Sci: Mater Electron 31, 20824–20832 (2020). https://doi.org/10.1007/s10854-020-04595-x