YAl_3(BO_3)_4∶Eu^(3+)荧光粉的化学沉淀法制备研究

Precipitation preparation and luminescence of phosphor YAl_3(BO_3)_4∶Eu^(3+)

以化学沉淀法制备单相的铕离子掺杂硼铝酸盐红色荧光粉YAl3(BO3)4∶Eu3+,考察了焙烧温度、掺铕量等因素对材料性能的影响,用X射线衍射、扫描电镜、激发光谱和发射光谱对荧光粉的结构、形貌和发光性能进行了表征.以尿素为沉淀剂,900℃焙烧沉淀前驱体可得到单相荧光粉YAl3(BO3)4∶Eu3+,反应温度比传统高温固相法降低了300℃;沉淀法制备的荧光粉粒径分布范围小,无团聚现象,粒径约300nm.掺铕量为10%(物质的量比)时发光强度最大.在260nm的紫外光激发下,Eu3+的5 D0→7 F2的电偶极跃迁最强,发射光为618nm的红光.

The red phosphor YAl3（BO3）4 ： Eu3＋ was prepared successfully by chemical precipitation method. The phosphor was characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and luminescence spectra. Using urea as precipitating agent, the single phase phosphor YAl3 （BO3）4： Eu3＋ was obtained at 900 ℃ by calcining precipitation precursor, which is 300 ℃lower than temperature of solid state reaction. The particles are approximately 300 nm size with narrow distribu- tion range. The luminescent properties of YAl3 （BO3）4 ： Eu3＋ phosphor with 10% doping concentra- tion of Eu3＋ is optimal. In emission spectra, the strongest peak at 618 nm correlating to red emission under 260 nm monitoring wavelength is due to the forced electric dipole transition 5D0→7F2 of Eus＋ ions.