Manipulation of Temperature-Dependent Luminescence Behaviors of Mn<sup>4+</sup>-Activated Fluoride Phosphors
Debao Zhang, Ji Zhou, Xuguang Cao, Xiaotian Ge, Fei Tang, Changcheng Zheng, Jiqiang Ning, Shijie Xu
Abstract
In this paper, the giant tunability of thermal behaviors, i.e., from thermal deterioration to substantial growth, is firmly demonstrated for the vibronic luminescence of Mn 4+ ions in fluoride phosphors. Such peculiar behavior is uncovered to be associated with the thermal excitation of a low-frequency phonon bath, and a theoretical model involving the excitation-wavelength-dependent populations of vibronic levels and the temperature-dependent nonradiative recombination processes is successfully constructed. Two main governing parameters, namely, the thermal activation energy E a and the involved average phonon energy Δ E, are thus determined for the distinct thermal behaviors of Mn 4+ -ion luminescence. This demonstration may pave the way for manipulating the thermal behaviors of vibronic luminescence in solids to some extent.