J Phys Condens Matter. 2014 Jan 15;26(2):025406. doi: 10.1088/0953-8984/26/2/025406.
Nd3+-doped fluorozirconate-based glasses which contain hexagonal BaCl2 nanocrystals are analyzed for their photoluminescence and multiphonon relaxation (MPR) properties. The MPR rates of various Nd3+ levels are obtained from time-resolved spectroscopy using selective laser pulse excitation. The nonradiative decay rates are estimated from the difference between measured and calculated radiative decay rates as well as from the analysis of luminescence rise times. The MPR rates display an exponential dependence on the energy gap. Temperature-dependent studies of the decay indicate that phonons of the BaCl2 nanocrystals are involved in the MPR processes leading to extremely low MPR rates which are orders of magnitude lower than in conventional oxide and halide glasses. Photoluminescence emissions,which are usually quenched by MPR, and enhanced radiative quantum efficiencies are found.
对掺 Nd3+氟锆酸盐玻璃中存在的六方 BaCl2 纳米晶进行了光致发光和多声子弛豫（MPR）性能分析。采用选择性激光脉冲激发的时间分辨光谱法获得了各种 Nd3+能级的 MPR 速率。非辐射衰减速率是通过测量和计算的辐射衰减速率之间的差异以及对荧光上升时间的分析来估计的。MPR 速率与能隙呈指数关系。衰减的温度依赖性研究表明，BaCl2 纳米晶的声子参与了 MPR 过程，导致 MPR 速率极低，比传统的氧化物和卤化物玻璃低几个数量级。发现通常被 MPR 猝灭的光致发光发射得到增强，辐射量子效率提高。
