Synthesis and luminescence properties of Eu^(3+),Sm^(3+) doped(Y_xGd_(1-x))_2O_3:Si^(4+),Mg^(2+) long-lasting phosphor

摘要

A novel red long-lasting phosphor,(Y1-xGdx)2O3:Eu3+,Sm3+,Si4+,Mg2+,was synthesized by the co-precipitation method using oxalate precipitation as the precursor.X-ray diffraction(XRD),scanning electronic microscopy(SEM),integrated thermal analyzer(TG),and photoluminescence spectra(PL) as well as the ST-900PM weak light photometer were used to study the synthesis conditions,morphology,luminescence properties,and the decay time of the phosphor.The XRD results show that the products synthesized at 1400°C for 4 h have good crystallization without any detectable impurity phases.Based on the PL spectra,the optimal conditions are as the following.The molar ratios of Y3+ to Gd3+ and Eu3+ to Sm3+ are 2:8 and 3:1,respectively,and the contents of Mg2+ and SiO2 are 5mol% and 3mol%,respectively.The decay time monitored by the ST-900PM weak light photometer is 7200 s,increasing 44% and 100%,respectively,compared with the Eu3+ and Sm3+ single-doped phosphors.The results indicate that the energy transfer is from Sm3+ to Eu3+ ion,and Sm3+ is a good sensitizer to Eu3+.