Effect of Tb3+-Coped Concentration on Properties of Li2SrSiO4:Tb3+ Phosphor
A series of Tb3+-doped Li2SrSiO4phosphors were prepared by high temperature solid state reaction. Effect of Tb3+-coped concentration on luminescence properties of Li2SrSiO4: Tb3+phosphor was investigated by XRD, FTIR, PL and CEI measurements. The results showed that the unit cell constant of Li2SrSiO4:Tb3+was reduced gradually with increasing Tb3+concentration, and then the FTIR absorption intensity assigned to the stretch vibration of [SiO4] and bend vibration of Si-O was decreased. The emission properties of Li2SrSiO4:Tb3+phosphors are strongly dependent on the concentration of Tb3+. The stronger blue and weaker green emission were shown as adding 1% Tb3+amount, while single bright green emission was presented in 20% Tb3+contents. The corresponding CIE was observed from (0.192, 0.315) to (0.246, 0.599). The results showed that the luminescence properties of Li2SrSiO4:Tb3+phosphor could meet various requirements by tuning the Tb3+-doped concentration.