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

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.