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- W1978800896 abstract "Er3+/Yb3+ co-doped oxy-fluoride powders with varying Er/Yb concentration were prepared by a melt quenching method at various sintering temperature. The effect of the Er/Yb doped concentration and sintering temperature were analyzed by using optical absorption and emission techniques. The Judd–Ofelt theory has been used to evaluate the three intensity parameters (Ωλ, where λ = 2, 4 and 6) and calculate the oscillator strengths (fc). Ultraviolet-to-visible emissions were observed under the excitation of a 325 nm CW laser. It was found that the down-conversion fluorescence intensity changes with the sintering temperature and Er/Yb content ratio, the results were explained with the level transitions in Er3+/Yb3+ co-doped systems. The intensity ratios (intensity of 437 nm as reference) of the luminescence spectra that the samples sintered at various temperature are relevant to Ω6 parameter which indicates the vibration amplitude of the Er–O distance. The sintering temperature also has an influence on the intensity ratios via affecting the thermalization of the excited 4I15/2 level." @default.
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- W1978800896 date "2015-08-01" @default.
- W1978800896 modified "2023-10-16" @default.
- W1978800896 title "Synthesis and down-conversion luminescence properties of Er3+/Yb3+ co-doped AlF3–PbF2–CaF2 powders" @default.
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- W1978800896 doi "https://doi.org/10.1016/j.optmat.2015.04.004" @default.
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