Structural and photoluminescence properties of terbium (III) activated Li2SiO3 phosphors: an approach for bluish-green light emission

In this paper, a series of bluish-green emitting Li2SiO3:xTb(3+)(x = 0.01, 0.02, 0.03, 0.04 and 0.05 mol) phosphors were synthesized by solid state reaction method. The effects of Tb3+ doping concentration on photoluminescence (PL) properties of Li2SiO3:xTb(3+) were investigated. Powder X-ray diffraction (PXRD) analysis show that the prepared phosphors confirm the sample has orthorhombic crystal structure. Energy dispersive X-ray analysis (EDX) shown that Tb element are uniformly doped in Li2SiO3 phosphor with a proper stoichiometric ratio. UV-Visible absorption spectroscopy was used to determine the band gap of Li2SiO3:0.04Tb(3+) phosphor. The near ultraviolet light at the wavelength of 379 nm can excite this phosphor and exhibits blue emission at 484 nm at transition D-5(3) -> F-7(6), and green emission at 541 nm at transition D-5(4) -> F-7(5.) The critical quenching concentration of Tb3+ in Li(2)SiO(3)host is 0.04 mol(.) The life time measurements were also performed for Li2SiO3:0.04Tb(3+) phosphor and estimated average life time. From the photometric properties result indicates that prepared phosphors were emit bluish-green light and they were useful for the solid state lighting applications.