K_2SiF_6:Mn^(4+)发光粉的合成及性能研究  

Study on Synthesis and Properties of K_2SiF_6:Mn^(4+) Phosphor

作　　者：何清洋 朱月华[2] 卓宁泽[2] 王海波[2] HE Qing-yang;ZHU Yue-hua;ZHUO Ning-ze;WANG Hai-bo(College of Materials Science and Engineering,Nanjing Tech University，Research Institute of Electric Light Source Materials,Nanjing Tech Universit)

机构地区：[1]南京工业大学材料科学与工程学院,南京210009 [2]南京工业大学电光源材料研究所,南京210015

出　　处：《材料工程》2018年第8期51-56,共6页Journal of Materials Engineering

基　　金：国家重点研发计划资助项目(2016YFB0400600;2016YFB0400605);江苏省科技成果转化项目(BA2014073);科技部2014年科研院所专项(2014EG111223)

摘　　要：采用高效离子交换法制备K_2SiF_6:Mn^(4+)荧光粉,研究不同K/Mn原料摩尔比和不同反应时间对K_2SiF_6:Mn^(4+)荧光粉结构及性能的影响,并采用溶胶-凝胶法对制备的K_2SiF_6:Mn^(4+)荧光粉表面包覆SiO_2来提高K_2SiF_6:Mn^(4+)荧光粉的热稳定性。通过XRD,SEM,EDS,PL等方法对样品结构、表面形貌、元素组成和发光性能进行测试和分析。结果表明:当K与Mn原料摩尔比为43∶38,反应8h制备的K_2SiF_6:Mn^(4+)荧光粉样品具有立方晶系结构并且发光性能最优,在460nm的蓝光激发下,最强窄带发射峰位于630nm处(2Eg→4 A2)。包覆后的K_2SiF_6:Mn^(4+)红色荧光粉的表面上包覆了一层无定形的SiO_2,晶体结构没有改变。包覆前后荧光粉的发光性能测试结果表明包覆SiO_2的K_2SiF_6:Mn^(4+)样品的热稳定性得到改善。K2SiF6：Mn^4＋phosphor was prepared by wet chemical etching,and the effect of the raw material molar ratio of K/Mn of different materials and different reaction time on the structure and properties of phosphor was studied,the surface of K2SiF6：Mn^4＋was coated with SiO2 to improve the thermal stability of K2SiF6：Mn^4＋phosphor by sol-gel method.The structure,morphology,excitation spectrum and emission spectrum of phosphor powder were characterized by X-ray diffraction,scanning electron microscope and fluorescence spectrometer.The results show that the change of K/Mn ratio does not change the crystal structure of K2SiF6：Mn^4＋,the sample has cubic structure.At 460 nm excitation,the strongest narrowband emission peak is located at 630 nm（^2 Eg→^4 A2）.The crystal structure of K2SiF6：Mn^4＋phosphor coated with SiO2 has not been changed.The results show that the thermal stability of the K2SiF6：Mn^4＋phosphor coated with SiO2 is improved.

关 键 词：K2SiF6:Mn^4+ K/Mn 红色荧光粉 结构与性能 SiO2包覆 

分 类 号：TQ137[化学工程—无机化工]