Influence of heat treatment on the structural and optical properties of SrGd2O4:Eu3+ phosphor

Abstract Novel red emitting Eu 3+ doped SrGd 2 O 4 phosphors were synthesized by homogeneous precipitation method followed by a subsequent combustion process at various temperatures. A systematic study on the consequent structural evolution and optical properties were investigated as a function of various processing temperatures. With the enhancement of processing temperature, SrGd 2 O 4 phosphor showed a gradual transformation from a mixed phase to monophasic nature, with minimized volatile impurities. The microscopic images exhibited homogeneous aggregates of varying shapes and sizes with an average length of about 0.5–5 μm. Eu 3+ doped SrGd 2 O 4 phosphors prepared at low temperatures, showed miserably low values of red emission upon UV excitation owing to the presence of volatile impurities. The SrGd 2 O 4 :Eu 3+ phosphors prepared at relatively high temperature exhibited strong red-orange emissions due to homogeneously occupied Eu 3+ ions in the host lattice. The dominant red to orange (R/O) emission intensity ratios and CIE parameters of Eu 3+ ions substantiated the site occupation of higher asymmetry sites of Gd 3+ ions and the strong covalent nature. Dexter theory and critical distance calculation suggested that the dipole-dipole interaction could be responsible for the concentration quenching of Eu 3+ (4 mol.%) doped SrGd 2 O 4 phosphors. Elevated physical and chemical durability and stable photoluminescence made these phosphors suitable for white LEDs and other display applications.