Gd2O2S∶Pr3+荧光粉的合成与发光性能研究-中国材料进展

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Author(s):: LIAN Jingbao; LIU Fan; ZHANG Jing; YANG Yanyu; WANG Xuri; ZHANG Zhaoren; School of Mechanical Engineering, Liaoning Shihua University

摘要:: 采用Gd(NO3)3、Pr6O11、HNO3、(NH4)2SO4和NH3·H2O为实验原料，通过共沉淀还原法合成了Gd2O2S∶Pr3+荧光粉。利用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）和光致发光（PL）等手段对合成产物进行了表征。结果表明前驱体具有非晶态结构，在空气气氛中800 ℃煅烧2 h能转化为单相的Gd2O2SO4粉体，该粉体在氩氢混合气氛下800 ℃煅烧1 h能转化为单相的Gd2O2S粉体。Gd2O2S粉体呈准球形，粒径大约1 μm左右，团聚严重。PL光谱分析表明在303 nm的紫外光激发下，Gd2O2S∶Pr3+荧光粉呈绿光发射，主发射峰位于514 nm，归属于Pr3+离子的3P0-3H4跃迁，Pr3+离子的猝灭浓度为1mol%。

Abstract:: A coprecipitation reduction method for synthesizing Gd2O2S∶Pr3+ phosphors was developed, using Gd(NO3)3·6H2O, Pr6O11, HNO3, (NH4)2SO4 and NH3·H2O as the starting materials. The characterizations of the synthetic products were obtained by fourier transform infrared spectroscopy (FTIR), Xray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. The results revealed that the as synthesized precursor has noncrystalline structure and could be transformed into single phase Gd2O2SO4 by calcining at 800 oC for 2 h in air. By calcining the Gd2O2SO4 at 800 oC for 1 h in argon and hydrogen mixed atmosphere, pure Gd2O2S phase can be synthesized and this phosphor particles are quasispherical in shape, serious aggregation and about 1 μm in size. PL spectra of the Gd2O2S∶Pr3+ phosphors under 303 nm ultraviolet light excitation show a green emission at 514 nm as the most prominent peak, which attributes to the 3P0-3H4 transition of Pr3+ ions. Moreover, the quenching concentration of Pr3+ ions is 1mol%.