掺铕稀土磷酸钙红色荧光粉的制备及其电荷补偿  

Preparation of red-emitting Eu-Doped tertiary calcium phosphate phosphor and its charge compensation

作　　者：陈力[1] 张占辉[1] 郭德兴 蔡克勤 刘恒[1] 陈亚男[1] 黄志良[1] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430074 [2]佛山红狮陶瓷有限公司新产品开发中心,广东佛山528031

出　　处：《武汉工程大学学报》2012年第5期42-46,共5页Journal of Wuhan Institute of Technology

基　　金：国家973预研项目(2011CB411901);教育部长江学者及创新团队项目(IRT974);湖北省科技厅重点项目(2011CDA050);佛山市禅城区产学研专项资金项目(2010B1027)

摘　　要：采用高温固相法在1 200℃下制备了Ca3(PO4)2∶Eu3+红色荧光粉,并通过X射线衍射分析和荧光光谱分析表征,考察荧光粉的物相、发光性质以及激活剂Eu3+的最佳掺杂浓度,研究结果发现Eu3+取代Ca2+占据八面体中心格位,由于离子半径差异,产生大量晶格缺陷,影响其发光性能.为了进一步提高其发光强度,在荧光粉中引入了电荷补偿剂Na+.通过研究Na+浓度对荧光粉发光性质的影响,发现电荷补偿后荧光粉的发射强度是电荷补偿前发射强度的2.9倍左右,得到荧光粉最佳化学组成为Ca2.3Na0.4(PO4)2∶0.3Eu3+.根据缺陷的生成和反应原理,并结合晶体场环境的中心对称性变化,提出电荷补偿的微观机制主要包括缺陷反应以消除晶格畸变和降低晶格中心对称性以增强红光发射.We prepared red-emitting Ca3（PO4）2∶ Eu3＋ phosphor by solid-state reaction at 1 200 ℃.The methods of X-ray diffraction and photoluminescence analysis were used to investigate the crystal phases,luminescent properties and optimal Eu3＋ doping concentration.It showed that Eu3＋ occupied the sites of Ca2＋ in the lattice structure,for the diversity of their ionic radius,luminescent properties was effected by the serious lattice distortion.To further improve the luminescent intensity,we incorporated Na＋ acting as a charge compensator into the phosphor.According to the effects of Na＋ concentration on the luminescent properties,it was found that the red emission intensity of charge compensated phosphor was about 2.9 times of that of the phosphor without charge compensation.Ca2.3Na0.4（PO4）2∶ 0.3Eu3＋ was determined to be the composition with the strongest emission intensity.According to the formation and reaction of defect,and the changes of the site centrosymmetry for activator,we proposed the mechanism about charge compensation,which mainly included removing lattice distortion by defect reaction,and improving the red emission by weakening the site centrosymmetry for cations.

关 键 词：掺铕稀土磷酸钙 红色荧光粉 高温固相法 发光性质 电荷补偿 

分 类 号：TB333[一般工业技术—材料科学与工程]