摘要
利用水热法合成Yb3+共掺杂La2Sn2O7:Er3+上转换发光材料,采用X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶红外光谱(FT-IR)、紫外可见漫反射光谱(UV-Vis)和上转换发光光谱(UPL)对Yb3+掺杂量对合成样品的上转换性能及反应体系pH对合成样品的物相结构进行分析。结果表明,反应体系的pH和Yb3+掺杂量分别影响着所制备样品的物相结构和上转换性能。反应体系pH为13的水热环境下制备的样品为单一相烧绿石结构的La2Sn2O7样品。上转换图谱分析结果表明,所制备的Yb3+共掺杂La2Sn2O7:7%(原子分数)Er3+在980 nm的近红外光激发下在529, 550和665 nm处分别出现了Er3+的上转换发射特征峰,并对Yb3+共掺杂La2Sn2O7:7%Er3+样品的上转换敏化发光机制进行了分析,其中位于529 nm处的绿色光发射属于双光子吸收发光机制,且当Yb3+掺杂量高于14%时观察到浓度猝灭现象。
Yb3+co-doped La2Sn2O7:Er3+crystals were successfully synthesized by hydrothermal method.The influence of the Yb3+doping content and the pH of the reaction system on the phase structures,morphologies,and optical properties of the as-synthesized Yb3+co-doped La2Sn2O7:Er3+crystals are characterized by X-ray powder diffraction(XRD),scanning electron microscope(SEM),Fourier infrared spectrum(FT-IR),Ultraviolet visible diffuse reflection spectrum(UV-Vis)and up-conversion luminescence spectroscopy(UPL).The results showed that the Yb3+doping amount and the pH markedly affected the structure and the up-conversion emission properties of the samples,respectively.The single phase La2Sn2O7 crystals with pyrochlore structure were prepared at pH 13.The results showed that the Yb3+co-doped La2Sn2O7:7%Er3+samples emitted the up-conversion emission peaks of Er3+at 529,550 and 665 nm,respectively,under 980 nm near infrared light excitation.The possible up-conversion emission mechanism of the Yb3+co-doped La2Sn2O7:7%Er3+samples was briefly proposed.The emission mechanism for the emission at 529 nm was found to be two-photon absorption-emission.Furthermore,the concentration quenching was observed when the Yb3+doping amount was over 14%.
作者
黄一男
李娟
李慧玲
李蓝苹
陈雪羽
杨锦瑜
Huang Yinan;Li Juan;Li Huiling;Li Lanping;Chen Xueyu;Yang Jinyu(School of Chemistry and Materials Science,Guizhou Normal University,Key Lab for Functional Materials Chemistry of Guizhou Province,Guiyang 550001,China)
出处
《中国稀土学报》
CAS
CSCD
北大核心
2019年第4期418-425,共8页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(21361007,51776046)
贵州省科学技术基金项目(黔科合基础[2019]1229)资助
