Synthesis and photoluminescence properties of Ba2CaZn2Si6O17:Tb3+ green phosphor

Ba2Ca1-xZn2Si6O17:xTb(3+) green emitting phosphors with different concentrations (x = 0.01, 0.03, 0.06, 0.08, 0.10, 0.15 and 0.20) of Tb3+ ions were synthesized using solid state reaction method. The phase composition of the synthesized phosphors was confirmed by powder X-ray diffraction (PXRD). The morphology was studied using scanning electron microscope (SEM). The excitation and emission spectra were measured to characterize the photoluminescence properties. The optimum Tb3+ concentration in this phosphor was 10 mol%. The Tb-Tb critical distance was calculated to be similar to 19.6 angstrom. The dipole-dipole interaction dominates in the non-radiative energy transfer between the Tb3+ ions and causes the concentration quenching. The decay time value of the Ba2CaZn2Si6O17:0.10Tb(3+) phosphor is about 4.86 ms. The CIE coordinates were calculated as x = 0.242,y = 0.383. The quantum efficiency for x = 0.10 sample excited by 240 nm is 14.3%. (C) 2016 Elsevier B.V. All rights reserved.