采用改进过的布里奇曼法成功地生长了Tm3+离子浓度从0.5～4 mol%变化的高质量Na5Lu9F32单晶.在790 nm LD激发下, 研究了不同Tm3+掺杂晶体在1.86 μm波段的荧光发射性能、衰减曲线以及Tm3+离子之间的能量传递过程.当Tm3+离子掺杂浓度增加到~1.95 mol%时, 晶体在1.86 μm处的荧光发射强度达到最大.然后, 随着Tm3+离子浓度进一步的增大, 发射强度迅速下降.然而, Tm3+离子在3F4能级处的荧光寿命随着Tm3+掺杂浓度从0.5增加到4 mol%, 逐渐降低.同时计算了1.86 μm处最大的受激发射截面为0.80×10－20 cm2.Tm3+离子的浓度猝灭效应和离子之间的交叉弛豫能量传递过程是造成1.86 μm荧光发射变化的主要原因.

The high quality Na5Lu9F32 single crystals with different Tm3+ concentrations ranging from 0.5 to 4 mol% were grown successfully by an improved Bridgman method. The fluorescence spectra and decay curves at 1.86 μm were measured under the excitation of 790 nm LD to study the luminescent properties of the crystals and the energy transfer process between Tm3+ ions. The 1.86 μm emission intensity gradually increases to the maximum value when the Tm3+ concentration increases to around 1.95 mol%. Nevertheless, it decreases fleetly with the Tm3+ concentration further increase from 2.0 mol% to 4.0 mol%. The maximum stimulated emission cross section at 1.86 μm is also calculated to 0.80×10－20 cm2. The 1.86 μm fluorescence lifetime of Tm3+∶3F4 level decreases with the increase of Tm3+ doping concentration. The concentration quenching effect of Tm3+ ions and the cross relaxation energy transfer process between Tm3+ ions are mainly in charge of the variety of the 1.86 μm emission.