Tunable luminescence of K2MgSi3O8:Ce3+, Tb3+ phosphors through energy transfer

摘要

A series of K2MgSi3O8:xCe(3+) (x = 0.01-0.09), K2MgSi3O8:0.05Ce(3+), yTb(3+) (y = 0-0.09) phosphors was prepared by solid-state method. X-ray diffraction was used to determine the crystal phase. Luminescence properties were characterized by photoluminescence (PL), photoluminescence excitation (PLE) spectra at room temperature. K2MgSi3O8:xCe(3+) series emits blue light when excited by UV-light (lambda(ex) = 350 nm). Nonequivalent substitution of K+ for Ce3+ leads to the multiple Ce3+ centers in the compound. K2MgSi3O8:Ce3+, Tb3+ exhibits broad band emission of Ce3+ and the characteristic line emission of Tb3+. The luminescence color could be tuned from blue (0.16, 0.10) to greenish blue (0.19, 0.26) by varying Tb3+ content. The energy transfer has been confirmed to occur via quadrupole-quadrupole interaction. These results indicate that the K2MgSi3O8:Ce3+, Tb3+ phosphor might be a promising material for w-LEDs application.