LAUSR

Abstract A new system, LiPbB5O9 phosphor with varied concentrations of Sm3+ ions was synthesized by the high temperature solid state reaction method. The X-ray diffraction profiles were obtained for all phosphors. The functional groups present in these samples were analysed by the FTIR spectrum. SEM images were used to examine the morphology of the as prepared phosphors. Thermal properties were studied by the TG-DTA analysis. The luminescent properties of LiPbB5O9:Sm3+ phosphor with varied concentrations of Sm3+ ions at λ e m  = 601 nm and λ e x  = 401 nm were studied. And also concentration quenching and energy transfer studies in these phosphors were reported. Energy transfer parameters (Q) and correlated colour temperatures (CCT) of LiPbB5O9:Sm3+ phosphors were calculated and reported. The lifetimes of 4G5/2 level in LiPbB5O9:Sm3+ phosphors were measured using decay curves. The colour co-ordinates, which are used to characterise the colour of the phosphors were also calculated. These results suggest that LiPbB5O9:Sm3+ phosphors could be promising candidates for orange-red light emission applications.