Influence of Eu3+dopant on lithium barium gadolinium phosphate glass properties for orange-reddish photonic devices

초록

The Eu3+-doped lithium barium gadolinium phosphate glasses were prepared using the conventional melt-quenching method with different concentrations of Eu2O3 and Gd2O3. The physical characteristics were deter-mined by refractive index, density, molar volume, oxygen packing volume, and oxidation states. Moreover, the optical characteristics were investigated via photoluminescence spectroscopy (PL), UV-vis spectroscopy, Radi-oluminescence (RL), and decay time. It was found that the Gd2O3 concentration of 12 mol% was the optimum composition for further investigations of the Eu2O3 doping concentration optimization. The emission spectra of PL and RL showed the strongest intensity of orange-reddish emission (lambda Ex = 394 nm) when the Eu2O3 concen-tration was at 0.3 mol% corresponding to energy transition from 5D0 -> 7F0,1,2,3,4. The oxidation state of Eu3+ ions due to the formation of non-bridging oxygens (NBO) in the glass network was confirmed by using X-ray Ab-sorption Near Edge Spectroscopy (XANE). Furthermore, the high transparency and fast decay time in the range of 2.4-2.8 ms displayed the potential to improve laser and radiation detector performances.

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