Synthesis of Sr 3Y 2(BO 3) 4:Eu 3+ and its photoluminescence under UV and VUV excitation

Abstract

To improve the chroma of red phosphors for plasma display panels, Eu 3+ activated Sr 3Y 2(BO 3) 4 (SYB) red phosphor were prepared by thermal decomposition of the corresponding nitrates method and photoluminescence (PL) spectra were investigated in detail. We found under 254 nm or 147 nm excitation, Sr 3Y 2(BO 3) 4:Eu phosphors showed a strong red emission at 612 nm corresponding to the electric dipole 5D 0– 7F 2 transition of Eu 3+. This is because Eu 3+ substituted for Y 3+ occupied the non-centrosymmetric position in the crystal structure of Sr 3Y 2(BO 3) 4. The concentration quenching of Sr 3Y 2(BO 3) 4:Eu is 15% under 254 nm excitation and 5% under 147 nm excitation. Compared with the (Y, Gd)BO 3:Eu, Sr 3Y 1.95Eu 0.05(BO 3) 4 has good color purity ( x = 0.640, y = 0.359) and its photoluminescence intensity is 40% that of (Y, Gd)BO 3:Eu. The photoluminescence intensity was improved 40% and 60%, respectively, after the La 3+ and Al 3+ were co-doped into Sr 3Y 2(BO 3) 4:Eu. It can be concluded that Sr 3Y 2(BO 3) 4:Eu 3+ is a promising red vacuum ultraviolet (VUV) phosphor for plasma display panels (PDPs) applications.