Synthesis and photoluminescence study of rare earth activated phosphor Na2La2B2O7

The photoluminescence properties in UV and N-UV excitable range for the phosphors of Na₂La₂B₂O₇: RE (RE=Eu, Tb, Ce, Sm, Gd) are investigated. The solution combustion synthesis technique was employed for the synthesis of the phosphors Na₂La₂B₂O₇: RE. The photoluminescence measurements of the phosphors were carried out on a HITACHI F7000 Fluorescence Spectrophotometer. The PL and PL excitation (PLE) spectra indicate that the main emission wavelength of Na₂La₂B₂O₇: Eu are 591 and 615 nm, Na₂La₂B₂O₇: Ce shows dominating emission peak at 387 nm and Na₂La₂B₂O₇: Tb displays green emission at 493, 544, 593 and 620 nm at 254 nm excitation, while Na₂La₂B₂O₇: Sm shows the main emission peak wavelengths 566 and 604 nm at 405 nm excitation and Na₂La₂B₂O₇: Gd shows dominating emission peak at 312 nm at 274 nm excitation. These phosphors may provide a new kind of luminescent materials under ultraviolet and near ultraviolet excitation for various applications.