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Luminescence properties of Tm2O3-doped germanate glass phosphors for near-infrared wideband light-source

Abstract

We synthesized Tm2O3-doped glass phosphors for a new near-infrared wideband light-source using a melt-quenching method and investigated their luminescence properties. Photoluminescence (PL) spectra at around 800 and 1200 nm were observed by blue light-emitting diode (LED) excitation in all samples. A shoulder structure appeared in the side of the short wavelength around 800 nm, and a dip structure around 1200 nm became deeper with increasing Tm2O3 concentration. The PL peak wavelength around 800 nm was shifted, and the PL intensity around 800 nm increased relative to that around 1200 nm with increasing Tm2O3 concentration. The PL band around 800 nm originated from the 1G4 → 3H5 and 3H4 → 3H6 transitions, and the PL band around 1200 nm was attributed to the 3H5 → 3H6 transition, which was determined by PL and PL excitation measurements. The absorption and PL spectra suggested that the shoulder structure around 800 nm and the dip structure around 1200 nm were caused by the self-absorption phenomenon of Tm3+ ions. From the dependence of the PL spectra on the excitation wavelength and Tm2O3 concentration, we clarified that the PL peak shift around 800 nm and the change of the relative PL intensity ratio between the PL band around 800 nm and that around 1200 nm were due to the cross-relaxation phenomenon. We successfully achieved an ultra-wideband luminescence spectrum from 700 to 1300 nm that covers the "optical window in biological tissue" by co-doping the glass phosphor with Tm2O3 and PrF3.

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Acknowledgements

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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Correspondence to Seiya Nishimura.

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Nishimura, S., Nanai, Y., Koh, S. et al. Luminescence properties of Tm2O3-doped germanate glass phosphors for near-infrared wideband light-source. J Mater Sci: Mater Electron 32, 14813–14822 (2021). https://doi.org/10.1007/s10854-021-06035-w

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