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

Blue–green-emitting Y 2 O 3 : [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 Y 2 O 3 host 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 ( 3 A[Formula: see text]A[Formula: see text], 410 nm ( 3 E[Formula: see text]A[Formula: see text] and 486 nm ( 3 B [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 Y 2 O 3 :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.