Synthesis and luminescence properties of Eu3＋, Sm3＋ doped （YxGd1-x）2O3： Si4＋, Mg2＋ long-lasting phosphor

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...

Synthesis and luminescence properties of Eu3+, Sm3+ doped (YxGd1-x)2O3:Si4+, Mg2+ long-lasting phosphor

A novel red long-lasting phosphor, (Y1-xGdx)2O3 :Eu3+, Sin3+, 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, morphol-ogy, luminescence properties, and the decay time of the phosphor. The XRD results show that the products synthesized at 1400℃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+.