Gd_2O_2S∶Pr^(3+)荧光粉的合成与发光性能研究

Synthesis and Luminescence Properties of Gd_2O_2S∶ Pr^(3+) Phosphors

采用Gd(NO_3)_3、Pr_6O_(11)、HNO_3、(NH_4)_2SO_4和NH_3·H_2O为实验原料,通过共沉淀还原法合成了Gd_2O_2S∶Pr^(3+)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Gd_2O_2SO_4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Gd_2O_2S粉体。Gd_2O_2S粉体呈准球形,粒径大约1μm左右,团聚严重。PL光谱分析表明在303 nm的紫外光激发下,Gd_2O_2S∶Pr^(3+)荧光粉呈绿光发射,主发射峰位于514nm,归属于Pr^(3+)离子的~3P_0-~3H_4跃迁,Pr^(3+)离子的猝灭浓度为1mol%。

A co-precipitation reduction method for synthesizing Gd2 O2 S ∶ Pr^3＋ phosphors was developed, using Gd （ NO3 ） 3 ·6H2 O, Pr6 O11 , HNO3 , （ NH4 ） 2 SO4 and NH3 ·H2 O as the starting materials. The characterizations of the syn-thetic products were obtained by fourier transform infrared spectroscopy （ FT-IR） , X-ray diffraction （ XRD） , scanning e-lectron microscopy （ SEM） , and photoluminescence （ PL） spectroscopy. The results revealed that the as synthesized pre-cursor has noncrystalline structure and could be transformed into single phase Gd2 O2 SO4 by calcining at 800 o C for 2 h in air. By calcining the Gd2 O2 SO4 at 800 o C for 1 h in argon and hydrogen mixed atmosphere, pure Gd2 O2 S phase can be synthesized and this phosphor particles are quasi-spherical in shape, serious aggregation and about 1μm in size. PL spec-tra of the Gd2 O2 S ∶ Pr^3＋ 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 Pr^3＋ ions. Moreover, the quenching concentration of Pr^3＋ions is 1mol%.