摘要：采用微波辅助共沉淀法制备紫外发射荧光粉Sr_1-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38μm,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。

关键词： 紫外发射;共沉淀法;荧光光谱

Abstract：The Ce³⁺-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 Ce³⁺ acted as a luminescent center probe into the single orthorhombic phaseSrCO₃ 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 CeCe³⁺concentration， and then decreased because of concentration quenching. The optimal concentration of CeCe³⁺ was 1.5% （molar fraction）. The concentration self-quenching mechanism was electric dipole-quadruple interactions. 

Keywords： ultraviolet emitting； co-precipitation； photoluminescence excitation spectrum