Synthesis and luminescence properties of Ln3+ (Ln3+ = Er3+, Sm3+)-doped barium lanthanum tungstate BaLa2WO7 phosphors

BaLa2WO7 phosphors activated with the trivalent rare-earth Er3+ and Sm3+ were synthesized via a solid-state reaction using a vibrating-mill method, and their luminescence properties were investigated. Er3+-doped BaLa2WO7 and Sm3+-doped BaLa2WO7 emit bright green and reddish-orange light, respectively. The photoluminescence investigations revealed that the phosphors exhibit apparent characteristic emissions from the 2H11/22H11/2 and 4S3/24S3/2 state, respectively, to the 4I15/24I15/2 ground state for Er3+, and 4G5/24G5/2 to 6H5/2,7/2,9/2 states for Sm3+ under near-UV excitation. The green emission of the Er3+-doped BaLa2WO7 phosphor had CIE chromaticity coordinates (0.249, 0.717) with a dominant wavelength of 546 nm and a color purity of 92%. The Sm3+-doped BaLa2WO7 phosphor had color coordinates (0.558, 0.441), a dominant wavelength of 606 nm, and 94% color purity. The sharp emission peaks and excellent luminescence properties show that BaLa2WO7 is a suitable host for rare-earth-doped phosphors, which may be suitable for optical applications.

► Ln3+ (Ln3+ = Er3+, Sm3+)-doped BaLa2WO7 phosphors were synthesized by solid-state reaction. ► Green emissions at 527 and 546 nm were observed in Er3+-doped BaLa2WO7. ► Three emission peaks at 566, 606, and 650 nm were observed in Sm3+-doped BaLa2WO7. ► The decay behaviors of Ln3+ (Ln3+ = Er3+, Sm3+)-doped BaLa2WO7 phosphors were investigated. ► The corresponding CIE chromaticity coordinates of Er3+ and Sm3+-doped BaLa2WO7 phosphors were calculated.