以Gd2 O3,Yb2 O3,Er2 O3,HNO3,CO(NH2)2和C12H25SO4Na为实验原料,通过水热-还原法制备了yb3+和Er3+共掺杂的Gd2O2S∶ Yb3+,Er3+纳米粉体.通过傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)、透射电子显微镜(TEM)、选区电子衍射(SAED)和上转换发射光谱(UPL)分析手段对合成产物的结构、形貌和上转换发光性能进行了表征.结果表明,Gd3+∶ CO(NH2)2∶ SO2-=2∶ 1∶x的摩尔比对合成产物的结构有显著的影响,当x=1.0时合成的前驱体在90％ Ar+ 10％ H2混合气氛下800℃煅烧2h可获得单相Gd2 O2S纳米粉体,该Gd2 O2S粉体颗粒呈现近球形,平均颗粒尺寸约30 nm,具有一定的团聚特征.上转换发射光谱表明在980 nm红外光激发下,Gd2 O2S∶Yb3+,Er3+纳米粉体的上转换光谱图的主次发射峰分别位于671 nm和548 nm,归属于Er3+的4 F9/2 →4I15/2和4S3/2→4I15/2跃迁.Er3+的猝灭浓度为5％,Gd2 O2S∶Yb3+,Er3+的发光机制为双光子模型.
Gd2O2S:Yb3+,Er3+ nanopowders were fabricated by hydrothermal method assisting with reduction route utilizing commercially available reagents of Gd2O3,Yb2O3,Er2O3,HNO3,CO (NH2)2and C12 H25 SO4Na.The structure,morphology and up-conversion luminescent properties were characterized by fourier transform infrared spectroscopy (FT-IR),X-ray diffractometry (XRD),transmission electron microscopy (TEM),selected area electron diffraction (SAED) and up-conversion luminescence spectra (UPL).The results show that the molar ratio of Gd3 + ∶ CO(NH2) 2∶ SO42-=2∶1∶ x have a significant influence on the structure of the as prepared products.The precursor synthesized with x =1.0 could be converted into pure Gd2O2S phase by calcining at 800 ℃ for 2 h in the hybrid atmosphere of flowing hydrogen and argon (90％ Ar + 10％ H2) resulting in quasi-spherical and agglomerated morphology with 30 nm in size.Under 980 nm infrared light excitation,UPL spectra of the Gd2O2S∶Yb3+,Er3+ nanophosphors show a red emission at 671 nm as the most prominent peak and a green emission at 548 nm as the secondary emission peak,which attribute to the 4F9/2→4I15/2 and 4S3/2→4I15/2 transitions of Er3 + ions.The quenching concentration of Er3+ ions is 5％,and the emission mechanism is two photo model.
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