Zhou Shaoshuai, Duan Changkui, Wang Mei
Opt Lett. 2017 Nov 15;42(22):4703-4706. doi: 10.1364/OL.42.004703.
The charge transfer band (CTB) of the VO43- groups in vanadates shifts to longer wavelengths with increasing temperature. The origin of this temperature-induced redshift was explored by studying the temperature-dependent excitation and emission spectra of GdVO ranging from 300 to 480 K. The influences of the thermal population and the decline of the charge transfer gap on the spectral shift were analyzed using the configurational coordinate diagram. We conclude that the thermal population of vibrational sublevels of the ground electronic energy level dominates the temperature-induced redshift of the CTB. Taking advantage of the redshift and the thermal quenching, a novel ratiometric temperature-sensing strategy was proposed. Drastic temperature dependence was achieved, indicating a promising candidate for an optical thermometer with high sensing performance.
钒酸盐中VO43-基团的电荷转移带（CTB）随着温度升高向更长波长移动。通过研究300至480 K范围内GdVO的温度依赖激发和发射光谱，探索了这种温度诱导红移的起源。使用组态坐标图分析了热布居和电荷转移能隙下降对光谱移动的影响。我们得出结论，基态电子能级振动子能级的热布居主导了CTB的温度诱导红移。利用红移和热猝灭，提出了一种新型的比率温度传感策略。实现了强烈的温度依赖性，表明其有望成为具有高传感性能的光学温度计的候选材料。
