A series of single-matrix phosphors Sr3CaNb2O9:xSm3+,yEu3+(x=0.04～0.09,y=0.03～0.15)were prepared by means of high-temperature solid-phase reaction,and the samples investigated in terms of their physical morphology,luminescence properties,energy transfer mechanism and CIE color coordinates.The finding results are as the following:the concentration quenching point of Sr3CaNb2O9:xSm3+ phosphor at an excitation wavelength of 407 nm is x=0.07;in Sr3CaNb2O9:0.07Sm3+,yEu3+ phosphor,the luminescence intensity of Sm3+ decreases while the luminescence intensity of Eu3+ increases and then decreases with the increase of the Eu3+ doping concentration,and the concentration quenching point of Eu3+ is y=0.09;the energy transfer of Sm3+→Eu3+ is dominated by dipole-dipole interactions with an energy transfer efficiency of 76.6％;and the color coordinate plot shows that the addition of Eu3+ ions shifts the color coordinate from the orange-red region to the pure red region.In addition,the samples have high color purity and low color temperature.The results show that Sr3CaNb2O9:Sm3+,Eu3+ phosphor is expected to be a candidate material for red light emitting substances in white LEDs.
Sr3CaNb2O9:Sm3+,Eu3+rare earth dopingluminescence propertiesenergy transfer
NETL
NSTL
万方数据
