The luminescence properties of Na2(Y1- xEux)2B2O7 and Y1- xEuxCa3 (AlO )3 (BO3 )4 under VUV excitation

Abstract The new borate phosphors Na 2 Y 2 B 2 O 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 5 D 0  →  7 F 1 at 592 nm was observed in the emission spectrum of Na 2 Y 2 B 2 O 7 :Eu 3+ and the best concentration for Eu 3+ was 10%. While strong red emission of 5 D 0  →  7 F 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.