Abstract
The photoluminescence (PL) properties of the Ba1-0.5xSr1-0.5xAl2SiO7:xM (0.01 <= x <= 0.04: M = Eu(2+)and Dy3+), and Ba0.985-0.5ySr0.985-0.5yAl2SiO7:0.03Eu(2+),yDy(3+)(0.01 <= y <= 0.03) phosphors are studied. The excitation spectra of the co-doped phosphors exhibit an asymmetric broad band in the 250 to 450 nm range, attributed to the transitions of Eu2+(4f(7)-> 4f(6)5d(1)). Upon 330 nm excitation, the Ba0.985-0.5ySr0.985-0.5yAl2SiO7:0.03Eu(2+),yDy(3+)(0.01 <= y <= 0.03) phosphors emit bluish-green emission in the 400-750 nm range, arising from the 4f(6)5d(1)-> 4f(7)transition of Eu2+. It was found that the Ba0.985-0.5ySr0.985-0.5yAl2SiO7:0.03Eu(2+),yDy(3+)(0.01 <= y <= 0.03) phosphors produced much stronger luminescence, similar to 350% higher than that of the Ba0.985Sr0.985Al2SiO7:0.03Eu(2+)phosphor.