摘要
为研究鳞石英衍生物BaMgSiO4:Eu(BMSO:Eu)荧光粉的光学性能,采用传统高温固相法在不同合成气氛下制备了BMSO:Eu和BMSO:Eu2+荧光粉样品。利用X射线衍射仪(XRD)、荧光分光光度计和电子自旋共振(ESR)光谱仪分别对BMSO:Eu和BMSO:Eu2+荧光粉的晶体结构、发光性能和缺陷类型进行了表征。XRD结果表明,晶格内存在3种等量的Ba2+位点,Eu2+/3+取代Ba2+位点且形成单相。荧光光谱表明,在还原气氛下制备的BMSO:Eu2+的激发光谱位于250~380 nm之间,发射光谱位于360~650 nm之间。由于存在自还原现象,在空气气氛下制备的BMSO:Eu的激发和发射光谱同时包括Eu3+和Eu2+光谱。由于氧空位的浓度不同,BMSO:Eu2+的余辉时间是BMSO:Eu的24倍。ESR实验表明BMSO:Eu2+中的氧空位多于BMSO:Eu。绿色长余辉发光表明该类荧光粉在白光LED器件上具有潜在的应用。
To study the optical properties of the stuffed tridymite BaMgSiO4:Eu(BMSO:Eu)phosphor,BMSO:Eu and BMSO:Eu2+phosphor samples were prepared by traditional high temperature solid-state method in different synthesis atmospheres.The crystal structures,luminescence properties and defect types of BMSO:Eu and BMSO:Eu2+phosphors were characterized by X-ray diffraction(XRD),fluorescence spectroscopy and electron spin resonance spectroscopy,respectively.XRD results show that three equal amounts of Ba2+sites exist in the lattice,and Eu2+/3+replace the Ba2+sites and form a single phase.Fluorescence spectra indicate that the excitation spectrum of BMSO:Eu2+prepared in a reducing atmosphere is between 250 and 380 nm,and the emission band is located in the range from 360 to 650 nm,respectively.The excitation and emission spectra of BMSO:Eu prepared in an air atmosphere include both Eu3+and Eu2+spectra due to the self-reduction phenomenon.The afterglow time of BMSO:Eu2+is 24 times longer than that of BMSO:Eu due to different concentrations of oxygen vacancies.Electron spin resonance experiments show that the oxygen vacancies in BMSO:Eu2+are more than those in BMSO:Eu.Green long afterglow luminescence indicates that the BMSO:Eu phosphor has potential applications in white light emitting diode devices.
作者
黄珂
包琪
樊烨明
周佳
王树林
徐慢
戴武斌
HUANG Ke;BAO Qi;FAN Yeming;ZHOU Jia;WANG Shulin;XU Man;DAI Wubin(Engineering Research Center of Environmental Materials and Membrane Technology of Hubei Province,School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China)
出处
《武汉工程大学学报》
CAS
2020年第3期312-315,326,共5页
Journal of Wuhan Institute of Technology
基金
武汉工程大学博士启动基金(16QD28)
湖北省自然科学基金(18S020)
湖北省教育厅科学技术研究计划项目(18S069)
武汉工程大学第十一届研究生教育创新基金(CX2019075)。
关键词
荧光粉
鳞石英衍生物
光学性能
高温固相法
自还原
余辉时间
氧空位
fluorescent powder
stuffed tridymite
optical property
high temperature solid-state method
self-reduction
afterglow time
oxygen vacancy
