Ca_2SiO_3Cl_2∶Dy^(3+)单一基质白光荧光粉的制备及发光特性

Preparation and luminance properties of the single white emitting phosphor Dy^(3+) doped Ca_2SiO_3Cl_2

采用溶胶-凝胶法合成了发射白光的Ca2SiO3Cl2∶Dy3+荧光粉。利用XRD分析了荧光粉的晶体结构,其为四方晶系。在350nm近紫外光激发下,荧光粉呈白光发射,有两个主发射峰位分别于482和573nm,分别对应于Dy3+的4F9/2→6H15/2和4F9/2→6H13/2跃迁;监测573nm最强发射峰,激发光谱覆盖200～450nm,主激发峰位于350nm。研究结果表明保温时间的延长有利于发射强度的提高,伴随着Dy3+浓度的增大,发射光谱图中的两个主发射峰先增强后减弱,Dy3+的最佳浓度为2%(摩尔分数)。

Ca2SiO3Cl2 ： Dy^3＋ white light phosphors was synthesized by sol-gel method. The phase of the samples was characterized by powder X-ray diffract ion （XRD）, it has tetragonal system. The phosphor shows two major emission peaks locating at 482 and 573nm by the near ultraviolet excitation peak of 350nm, which correspond to the 4F9/2→6H15/2 and 4F9/2→6H13/2 characteristics transport of Dy^3＋ , monitoring the strong emission peak at 573nm, the excitation band was covered from 300 to 470nm and the main peak of was located at 350 nm. The emission intensities increase with extending of the holding time. The experiment results suggested that the strongest emission was obtained when the concentration of the Dy^3＋ inns was 2mol %.