The luminescence properties of Na 2(Y 1− xEu x) 2B 2O 7 and Y 1− xEu xCa 3(AlO) 3(BO 3) 4 under VUV excitation

Abstract

The new borate phosphors Na 2Y 2B 2O 7:Eu 3+ and YCa 3(AlO) 3(BO 3) 4:Eu 3+ were synthesized and their luminescence properties were investigated under vacuum ultraviolet (VUV) excitation. Under VUV excitation, strong orange emission of 5D 0 → 7F 1 at 592 nm was observed in the emission spectrum of Na 2Y 2B 2O 7:Eu 3+ and the best concentration for Eu 3+ was 10%. While strong red emission of 5D 0 → 7F 2 transitions at 621 nm was observed for YCa 3(AlO) 3(BO 3) 4:Eu 3+ and the most intense emission obtained at the concentration of 8%. The broad bands at 210–230 nm in their excitation spectra were attributed to the charge transfer band of Eu 3+, and the two bands at 150–170 nm were assigned to the absorption of the host lattice. With the incorporation of Gd 3+, the luminescence intensity of Eu 3+ was improved greatly in both of the two host materials.