LiF及AlF_3对掺Tm^(3+)氟磷玻璃光学、光谱性质、析晶性能及结构的影响

Influence of LiF and AlF_3 on optical,spectroscopic, crystallization and structrural properties of Tm^(3+) doped fluorophosphate glass

为了平衡掺铥氟磷玻璃对辐射寿命、发射截面和析晶稳定性的综合要求,研究了LiF及AlF3对掺铥氟磷玻璃光学光谱性质和析晶性能的影响.研究表明,高达30mol%的LiF仍可保证氟磷玻璃具有较好的析晶稳定性能且其在提高Tm3+离子的辐射寿命上具有非常重要的作用;高AlF3玻璃具有很好的析晶稳定性能,但Tm3+离子在其中的辐射寿命下降较快;鉴于LiF和AlF3含量的相对变化对发射截面的影响不大,因此,调整LiF和AlF3在氟磷玻璃中的比例即可初步平衡对Tm3+离子3F4能级辐射寿命、发射截面和玻璃析晶性能的要求.通过J-O参数与玻璃某些性质的比对得出了高AlF3则稀土离子4f和5d轨道重叠积分增大的结论.Raman光谱证明较大幅度的LiF及AlF3含量的变化对玻璃在结构上造成很大改变.

To balance the requirements for lifetime,cross section and crystallization stability in rare-earth-doped fluorophosphate （FP） glass,we studied the influence of LiF and AlF3 on the properties of FP.Results indicate that LiF plays an important role in improving the radiative lifetime of Tm3 ＋ ,and the glass performs good crystallization stability with LiF proportion as high as 30mol% .Crystallization stability in high AlF3 glass is excellent but the radiative lifetime of Tm3 ＋ decreases fast.Emission cross section changes mildly with the variation of LiF and AlF3 proportions,so lifetime,cross section and crystallization stability can achieve their batter values through the ajustment of LiF and AlF3 proportions.Comparations between J-O parameters and several properties of the Tm3 ＋ doped FP glass show that with AlF3 increasing,the overlap integral of 4f and 5d orbitals of the rare earth ions increases.Raman spectra testify the great variation of glass structure when LiF and AlF3 contents change largely.