White/orange tunable light emitting and energy transfer of Dy3+/Sm3+dual-doped silicophosphate oxyfluoride glasses for photonic devices

초록

Silicophosphate oxyfluoride glasses by co-doping of Dy2O3 (Dy3+:0.5 mol%) with Sm2O3 (Sm3+:0.0, 0.1, 0.5, 1.0, 2.0, and 4.0 mol%) have been prepared using a melt and sudden quenching processes. The existence of Dy3+ (6H15/2) and Sm3+(6H5/2) peaks was studied via optical absorption spectra in the 280-1800 nm region. The emission spectra of the glasses were excited under two excitation wavelengths (350 and 401 nm). This resulted in a decrease in the emission intensities (4F9/2 -> 6H15/2, 13/2, 11/2, 9/2) of (Dy3+) and an increase in the emission intensities 4G5/2 -> 6H5/2, 7/2, 9/2, 11/2 of Sm3+. The energy transfer (ET) from Dy3+ to Sm3+ in current glasses results in a reduction of lifetime (Dy3+:4F9/2) due to dipole-dipole interaction. The ET efficiencies of current glasses were found to be 0.75-55.14 % with an increase of Sm3+ amounts. The radio luminescence (RL) spectra of current glasses were also studied under X-ray by applying a voltage of 50 kV and a current of 30 mA. This result showed the maximum scintillation efficiency of 16.85 % in the present 0.5Dy1.0Sm glass relative to the Bi4Ge3O12 (BGO) crystal. The emission color of current glasses has been confirmed by CIE1931 chromaticity diagram, which has shown on natural white/yellow and orange region with 350 and 401 nm, respectively.

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