Tunning of photoluminescence emission of Y2SiO5:Tb3+, Eu3+phosphors by altering the Tb3+, Eu3+ ratio

The Y2SiO5:Tb3+, Eu3+ phosphors were synthesized by a high temperature solid-state reaction method in air atmosphere and their crystal structures, lifetime, luminescence properties, and energy transfer mechanism were investigated in detail. A series of characteristic emissions of phosphors were observed in the emission spectra at around 545 nm, 593 nm, and 613 nm when excited at 350 nm. The energy-transfer mechanism from Tb3+ to Eu3+ in Y2SiO5 is determined by a dipole-dipole interaction. The CIE coordinates of the phosphors can be tuned from blue-green through white, to yellow and finally to orange-red with changing the Eu3+/Tb3+ ratio. The average decay time of Eu3+ increases from 2.10 to 5.81 ms with the concentration of Tb3+ increasing from 2% to 8%, and reaches the maximum at 0.08, and is shortened when the concentration of Tb3+ goes beyond 8%. (C) 2018 Elsevier Ltd. All rights reserved.