OH-对Er掺杂的亚碲酸盐氟氧化物玻璃上转换发光的影响

Er掺杂的亚碲酸盐玻璃具有很好的上转换性质,加入氟化物在干燥的气氛下可以制备低OH^-根含量的氟氧化物玻璃,同样组分在湿润的气氛下,仍有较高的OH^-根含量.通过傅里叶红外吸收光谱、荧光衰减曲线及上转换光谱研究了在干燥和湿润气氛下,亚碲酸盐氟氧化物玻璃的OH^-含量,以及对上转换发光的影响.在干燥的气氛下制备的亚碲酸盐玻璃的OH^-浓度为0.017×10²⁰cm^-3是湿润的气氛下制备玻璃中的1/15,其543nm绿光上转换效率增加了2.4倍.

Effect of Hydroxyl on the Up-conversion Luminescence of Er3+-doped Oxyfluoride Tellurite Glasses

The Er³⁺ doped tellurite up-conversion laser materials have been attracted much attention due to the applications in areas such as optoelectronics,optic-communication,and color display.The up-conversion emission efficiency of tellurite glasses is low,because of the multi-phonon relaxation.A simpler way of removing the OH^-from the glass during melting is to add a metal-fluoride to the batch and the fluoride will liberate hydrogen species from the melt.However,this process is effective in the dry air.In the humid atmosphere,water in the air can be reacted with fluoride to make the oxyfluoride tellutite glass with the residual OH^-.So the oxyfluoride tellurite glasses prepared in different air have different OH^-concentration.The oxyfluoride tellurite glasses with different OH^-concentration were prepared in dry air and in humid atmosphere.The Judd-Ofelt intensity parameters and the total spontaneous emissions probabilities A_ij,(branching)ratios β_ij and radiative lifetimes of the major emitting states of the Er³⁺ ion were determined from the absorption spectrum and Judd-Ofelt theory.The OH^-concentration of oxyfluoride tellurite glasses was studied by the Fourier transform infrared(FTIR)absorption spectra.The effect of OH^-on green up-conversion luminescence in the Er³⁺-doped oxyfluoride tellurite glasses was studied by fluorescence decay curves and up-conversion luminescence spectra.The OH^-concentration of oxyfluoride tellurite glass prepared in dry air is 0.017×10^-20 cm^-3,15 times lower than that of glass prepared in humid atmosphere(0.25×10^-20 cm^-3).The Er³⁺ ion ⁴S_3/2 level lifetime of glass with lower OH^-concentration is 60 μs increasing 40% than that of glass with(higher)OH^-concentration,and the 543 nm emission intensity increases 2.4 times.The up-conversion luminescence of Er³⁺ doped oxyfluoride tellurite glasses prepared in removing the OH^-process has a great improvement.