Abstract
Sm3+-doped oxy-fluoride (OFSm) powders are prepared by the melt quenching technique and characterized using FE-SEM, optical absorption and emission techniques. Spectroscopic properties of Sm3+-doped oxy-fluoride powders with different Sm3+ concentration and sintering temperature are presented and discussed by using the absorption, emission measurements. The Judd–Ofelt intensity (J–O) parameters (Ωλ, where λ=2, 4 and 6), measured from the experimental oscillator strengths of the absorption spectra, are used to evaluate the radiative parameters of the fluorescence transitions. Intense orange emission can be obtained when excited with 325nm wavelength by increasing the sintering temperature to 1400°C. Ratio of fluorescence intensities arising from the two closing lying 4F3/2 and 4G5/2 levels is studied, concentration quenching has been noticed beyond 2mol% of Sm3+ ions concentration. The excellent spectroscopic properties along with the outstanding thermal stability suggest that the OFSm03 powders may become an attractive laser material to exhibit efficient visible lasing emission in the orange spectral region.
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