Concentration quenching and resultant photoluminescence adjustment for Ca3Si2O7:Tb3+ green-emitting phosphor

Concentration quenching processes and the resulting influence on the photoluminescence properties of Ca3Si2O7:Tb3+ green-emitting phosphors are investigated in this work. Cross relaxation between activators and energy migration from activators to quenching center, are assigned to be the quenching mechanism for 5D3 emissions and 5D4 emissions of Tb3+ ions, respectively. Concentration quenching processes and the corresponding energy transfer are discussed in detail. The intensity ratio of the emissions from 5D4 to that from 5D3 is tuned by the concentration quenching processes. As a result, bluish-green, green and yellow-green emitting color is induced by concentration quenching effects for Tb3+ ions doped Ca3Si2O7 phosphors.