BaMgSiO4:Eu荧光粉的制备及光学性能

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。

Preparation and Optical Properties of BaMgSiO4: Eu Phosphor

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 Eu^2+/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.