A new long persistent blue-emitting Sr2ZnSi2O7:Eu2+, Dy3+ prepared by sol–gel method

Abstract This paper reports the detailed preparation and long lasting properties of Eu 2+ -activated Sr 2 ZnSi 2 O 7 phosphor by sol–gel method. The preparation process of Sr 2 ZnSi 2 O 7 was complicated and several intermediate phases were formed during the reaction process. The obtained phosphor showed two emission peaks at 385 and 457 nm, and they were due to the different Eu 2+ luminescent centers in Sr 2 ZnSi 2 O 7 host. Long afterglow was observed although the phosphor showed faint persistence. Investigation of thermoluminescence curve revealed one TL glow peak, which indicated the existence of the trap. The lifetime of the trap was calculated to be 212 s, which illustrated the faint afterglow.