Publication: Study of energy transfer processes between the rare earth ions in tri-doped upconversion nanoparticles NaGdF4:Yb-Er-Tm and NaGdF4:Yb-Er-Ho
Дата
2022
Авторы
Proydakova, V. Yu.
Romanishkin, I. D.
Kuznetsov, S. V.
Pominova, D. V.
Grachev, P. V.
Ryabova, A. V.
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© 2022 SPIE.Study of energy transfer processes between the rare earth ions in NaGdF4 nanoparticles tri-doped with rare earth ions Yb3+, Er3+ and Ho3+ or Tm3+ was carried out. The luminescence spectra in short-wave infrared and visible ranges were investigated. It was shown that Er3+ → Ho3+ energy transfer leads to Ho3+ luminescence increase. Both Er3+ and Ho3+ luminescence peaks were observed in short-wave infrared range. For Er3+ and Tm3+ co-doped nanoparticles it was hard to separate luminescence peaks in SWIR. However, both Er3+ and Tm3+ luminescence peaks were observed in visible range. We attribute this effects to Tm3+ → Er3+ energy transfer which occurs due to overlap of Er3+ and Tm3+ luminescence bands in short-wave infrared range which leads to Tm3+ luminescence decrease. This hypothesis was confirmed by study of β-NaGdF4 tri-doped with Yb3+, Er3+ and Tm3+ luminescence spectra during heating. The intensity of Tm3+ luminescence increased during heating due to non-resonant nature of Yb3+ →Tm3+ energy transfer and the shape of spectra changed.
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Study of energy transfer processes between the rare earth ions in tri-doped upconversion nanoparticles NaGdF4:Yb-Er-Tm and NaGdF4:Yb-Er-Ho / Proydakova, V.Yu. [et al.] // Progress in Biomedical Optics and Imaging - Proceedings of SPIE. - 2022. - 12194. - 10.1117/12.2626223