Visible and near infrared upconversion photoluminescence from Y2O3:Er3+, Yb3+, Li+ phosphors under 1532 nm excitation light

Huerta, E.F.; Cármona-Téllez, S.; Cabañas-Moreno, J. Gerardo; Falcony, C.

doi:10.1016/j.jallcom.2017.10.182

Cited by 20 publications

(1 citation statement)

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“…Figure a shows the luminescence spectra of NaYF 4 : Yb 3+ ,Er 3+ under 980 and 1532 nm irradiation, separately. We note that the 1.5 μm nm laser itself also induces the upconversion and emit green and red emission, as previously reported. − Figure b shows two plots: the black line (numerical sum) is the simple sum of the two spectra in Figure a, and the red line (optical sum) is the spectra when 980 and 1532 nm lasers irradiated the phosphor simultaneously. By subtracting the two plots, we recognize that the effect of the 1532 nm optical pumping is significant for the red emission (Supporting Information).…”

Section: Resultssupporting

confidence: 73%

Statistical Time-Resolved Spectroscopic Study on Upconversion Luminescence

et al. 2019

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Lanthanide phosphors have attracted great interest because of their highly efficient photonic upconversion processes. The upconversion spectra and time-resolved relaxation are influenced not only by the chemical composition of phosphors but also by the excitation characteristics of incident radiation. Despite numerous reports that upconversion spectra strongly depend on the experimental conditions, little research has been reported on the relationship between the temporal profile of excitation and the resulting luminescence spectra. In this study, we introduced time-and frequency-domain pulsed modulation spectroscopy to investigate statistical energy accumulation and relaxation in a NaYF 4 :Yb 3+ ,Er 3+ upconversion process. The modulation of a laser pulse width and interval showed that complete depopulation of hot phosphors required more than 5 ms. Furthermore, we demonstrated that the intermediate state ( 4 I 13/2 ) is populated in hot phosphors and affects upconversion luminescence.

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Section: Resultssupporting

confidence: 73%