Effect of Bi3+ ion concentration on crystal structure and luminescent properties of blue–green-emitting Y2O3:Bi3+ phosphors

Abstract

Blue–green-emitting Y2O3 : [Formula: see text]Bi[Formula: see text] ([Formula: see text] = 0.25–1.50 mol.%) phosphors were synthesized by a solution combustion method followed by high temperature annealing. The effect of Bi[Formula: see text] ion concentration on the crystal structure and photoluminescence performance of the phosphors were investigated. The results show that the cell parameter and cell volume of Y2O3host were increased with the Bi[Formula: see text] concentration, and all the phosphor powders exhibited porous lamellar structure with the width of [Formula: see text]500 nm. The emission spectra of the phosphors ([Formula: see text] = 335 nm) consist of three broadband emission spectra centered at 370 nm (3A[Formula: see text]A[Formula: see text], 410 nm (3E[Formula: see text]A[Formula: see text] and 486 nm (3B [Formula: see text]A), respectively. The phosphor exhibited the optimal luminescence performance at [Formula: see text]= 0.50% and the dipole–dipole and quadrupole–quadrupole interactions among Bi[Formula: see text] ions could lead to the concentration quenching. The color coordinates of Y2O3:0.50%Bi[Formula: see text] were (0.1595, 0.2250), indicating that the as-synthesized blue–green phosphors have a broad application prospect in the field of white light-emitting diodes.