紫外发射荧光粉SrCO_3:Ce^(3+)的制备及其发光性质  

Preparation and Photoluminescence Property of SrCO_3:Ce_^(3+) Ultraviolet Emitting Phosphor

作　　者：燕文清[1] 康明[1] 刘军[1,2] 孙蓉[1] 刘君玉[1] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料省部共建国家重点实验室培育基地,四川绵阳621010 [2]海洋王照明科技股份有限公司,广东深圳518052

出　　处：《中国粉体技术》2011年第4期61-64,共4页China Powder Science and Technology

基　　金：国家自然科学基金项目;编号:10976023

摘　　要：采用微波辅助共沉淀法制备紫外发射荧光粉Sr1-xCO3:xCe3+,并利用扫描电镜、激光粒度测试、X射线衍射和荧光光谱等分析手段分别对样品SrCO3:Ce3+的形貌、粒径、物相和发光性能进行表征。结果表明:掺杂Ce3+作为发光中心进入到纯斜方晶系碳酸锶晶格中,没有导致晶体结构的变化;样品呈类球状分布,粒径范围3~8μm,中值粒径d50=5.518μm;以254、327 nm波长激发均产生峰值位于354、378 nm的宽发射谱带,位于近紫外发射区,可以应用于黑光灯等;随着Ce3+离子掺杂浓度的增大,发光强度先增加后减小,其淬灭浓度为1.5%(摩尔分数);根据Dexter理论得出样品的浓度猝灭机理为电偶极-四极相互作用。The Ce^3＋-doped strontium carbonate phosphor was synthesized via co-precipitation route by microwave assisted. The phosphor powders were characterized by scanning electron microscopy （SEM）, laser particle size analyzer, X ray diffraction （XRD） and photoluminescence and photoluminescence excitation （PL-PLE） spectrum. The results showed that Ce^3＋acted as a luminescent center probe into the single orthorhombic phase SrCO~ not result in the crystal structure changed. The sample particles were in approximate spherical structure with size of 3-8 μm, median diameter d50=5.518 μm. Under the 254, 327 nm ultraviolet lamp, the PL spectrum showed a broadband absorption center in 354, 378 nm, which located in near ultraviolet emitting region and could be used in black light lamps etc.The luminescent intensities increased with the increasing Ce^3＋ concentration, and then decreased because of concentration quenching. The optimal concentration of Ce^3＋ was 1.5% （molar fraction）. The concentration self-quenching mechanism was electric dipole-quadruple interactions.

关 键 词：紫外发射 共沉淀法 荧光光谱 

分 类 号：O482.3[理学—固体物理]