Achieving high thermal stability of different rare earth ions in a single matrix host via manipulated the local structure by solid solution
Thermal quenching seriously restricts the practical application of phosphors, especially under high temperature and long-term working conditions. Here, we demonstrate that the as-obtained series of solid solution of Ca2-xYxAl2Si1-xAlxO7: Tb3+ (x=0-1, Ca2Al2SiO7→CaYAl3O7) phosphors exhibit an adjustable optical performance, where CaYAl3O7: Tb3+ with a shortened bond distance of the related polyhedron exhibits a greatly improved thermal stability compared with Ca2Al2SiO7: Tb3+. The shrinked bond distance strengthens the pressure of local structure and suppresses the non-radiative transition effectively, contributing to the prevention of the thermal degradation. The formed phosphor possessing excellent structure stability could be effectively incorporation with various lanthanide ions (Eu3+, Tb3+, Sm3+, Dy3+, and Pr3+) to address a pleochroism output.