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- W2036778875 abstract "In the present letter, the transparent oxyfluoride glass ceramics containing Ho<sup>3+</sup>-Tm<sup>3+</sup>-Yb<sup>3+</sup>:NaYF<sub>4</sub> were successfully prepared by melt-quenching at 1400°C and subsequent heating at 650-680°C for 1~2 hours . X-ray diffraction (XRD) with Cu K<sub>α</sub> radiation (λ=0.154nm) investigation revealed that NaYF<sub>4</sub> nano-crystals in the glass ceramics was fabricated. Their sizes were determined by Sherrer's equation. The emission spectra red green and blue up-conversion (UC) under 980nm laser diode (LD) pumping and absorption spectra were measured. Luminescence measurements confirmed the partition of RE ions in nano-crystals NaYF<sub>4</sub>. The blue red and green UC radiations correspond to the transitions <sup>1</sup>G<sub>4</sub>-<sup>3</sup>H<sub>6</sub>, <sup>1</sup>G<sub>4</sub>-<sup>3</sup>H<sub>4</sub> of Tm<sup>3+</sup>, <sup>5</sup>F<sub>4</sub>, <sup>5</sup>S<sub>2</sub>-<sup>5</sup>I<sub>8</sub>, <sup>5</sup>F<sub>5</sub>-<sup>5</sup>I<sub>8</sub>, of Ho<sup>3+</sup> ions, respectively. This is similar to that in Tm<sup>3+</sup>-Yb<sup>3+</sup> and/or Ho<sup>3+</sup>-Yb<sup>3+</sup> co-doped glass ceramics. To obtain upconversion fluorescence mechanisms, upconversion fluorescence intensity versus LD pump power were analyzed in view of energy levels of rare earth. Up-conversion mechanisms were discussed and the ratio between red, green and blue UC emission bands was found to be varied as a function of temperature of heat treatment and pump power. This result could be mainly attributed to the cross-relaxation between Ho<sup>3+</sup> ions. The excellent optical properties and its convenient, low-cost synthesis of the present glass ceramic imply that it is an excellent substitution material for the unobtainable bulk NaYF<sub>4</sub> crystal and may have potentially applications in tunable visible laser or many other fields." @default.
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- W2036778875 date "2011-06-09" @default.
- W2036778875 modified "2023-09-23" @default.
- W2036778875 title "Investigation on up-conversion luminescence properties of novel transparent Ho3+-Tm3+-Yb3+co-doped oxyfluoride glass ceramics" @default.
- W2036778875 doi "https://doi.org/10.1117/12.900795" @default.
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