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以尿素为沉淀剂,采用水热方法制备Gd2O3:Dy3+黄色发光粉。通过红外光谱、X射线衍射、扫描电镜以及荧光分光光度计对水热前驱体及目标产物进行分析表征。结果表明:水热前驱体为水合碳酸钆,经900℃焙烧后得到纯立方相的Gd2O3:Dy3+。其微观形貌为针状结构,长度约为10～200μm。Gd2O3:Dy3+的激发光谱由峰值为239,279,314,353nm的一系列激发峰组成,最强峰位于279nm处;发射光谱主要由两部分组成,分别为460～500nm的蓝光和560～590nm的黄绿光的发射峰(带),最强峰位于573nm处,归属为Dy3+的4F9/2-6H13/2跃迁。Dy3+的掺杂浓度对Gd2O3:Dy3+的发光强度有着重要的影响,发光强度随着Dy3+掺杂量的增加呈现先增大后减小的趋势,掺杂浓度为0.8%时发光强度最大,其浓度猝灭主要是由电偶极-电偶极相互作用所致。
Using urea as precipitating agent, Gd2O3: Dy3 + yellow luminescent powder was prepared by hydrothermal method. The hydrothermal precursors and target products were characterized by FTIR, X-ray diffraction, scanning electron microscopy and fluorescence spectrophotometer. The results show that the hydrothermal precursor is gadolinium hydrate and calcined at 900 ℃ to obtain pure cubic phase Gd2O3: Dy3 +. The microscopic morphology of acicular structure, the length of about 10 ~ 200μm. The excitation spectrum of Gd2O3: Dy3 + consists of a series of excitation peaks at 239,279,314 and 353 nm with the strongest peak at 279 nm. The emission spectrum mainly consists of two parts, blue emission of 460 ~ 500 nm and yellow-green emission of 560 ~ 590 nm Band) with the strongest peak at 573 nm assigned to the 4F9 / 2-6H13 / 2 transition of Dy3 +. The doping concentration of Dy3 + has an important effect on the luminescence intensity of Gd2O3: Dy3 +. The luminescence intensity first increases and then decreases with the increase of Dy3 + doping content. When the doping concentration is 0.8%, the luminescence intensity of Dy3 + Quenching is mainly caused by electric dipole-dipole interaction.