Manipulation of Temperature-Dependent Luminescence Behaviors of Mn4+-Activated Fluoride Phosphors

In this paper, the giant tunability of thermal behaviors,i.e.,from thermal deterioration to substantial growth, is firmly demonstratedfor the vibronic luminescence of Mn4+ ions in fluoridephosphors. Such peculiar behavior is uncovered to be associated withthe thermal excitation of a low-frequency phonon bath, and a theoreticalmodel involving the excitation-wavelength-dependent populations ofvibronic levels and the temperature-dependent nonradiative recombinationprocesses is successfully constructed. Two main governing parameters,namely, the thermal activation energy E ( a ) and the involved average phonon energy & UDelta;E, are thus determined for the distinct thermal behaviorsof Mn4+-ion luminescence. This demonstration may pave theway for manipulating the thermal behaviors of vibronic luminescencein solids to some extent.

Automated summary

In this paper, the giant tunability of thermal behaviors for the vibronic luminescence of Mn4+ ions in fluoride phosphors is demonstrated. The peculiar behavior is associated with the thermal excitation of low-frequency phonon bath, and a theoretical model is constructed to explain the phenomenon. The governing parameters for the distinct thermal behaviors of Mn4+-ion luminescence, including the thermal activation energy and the average phonon energy, are determined.