摘要
采用微波法制备LiBi(WO_(4))_(2):Eu^(3+)红光荧光粉.利用X射线粉末衍射(XRD)、扫描电镜(SEM)和荧光光谱仪,对荧光粉的晶体结构、形貌和光谱性能进行研究.在467.5 nm激发下,所有的LiBi(WO_(4))_(2):Eu^(3+)荧光粉在612 nm处表现出强烈的红色发射峰,该发光峰属于Eu^(3+)的^(5)D_(0)→^(7)F_(2)跃迁.在LiBi(WO_(4))_(2):Eu^(3+)荧光粉中,Eu^(3+)的最佳掺杂浓度x=11 mol%.在LiBi(WO_(4))_(2)中,Eu^(3+)浓度猝灭的主要途径为临近离子交换作用.样品的激发态动力学实验表明,当LiBi(WO_(4))_(2):Eu^(3+)荧光粉的掺杂浓度达到14 mol%时,没有出现明显的浓度猝灭现象.该研究所获得的荧光粉表现出良好的色饱和度和低色温,是一种潜在的、性能优异的白光LED用红光荧光粉材料.
Red emissive phosphors LiBi(WO_(4))_(2):Eu^(3+)were prepared by microwave method.The crystal structure,morphology and optical properties of the obtained phosphors were studied by X ray powder diffraction(XRD),scanning electronic microscope(SEM),and fluorescence spectrometer.The obtained phosphors exhibited intense red emission peaks around 612 nm under the excitation of 467.5 nm,which belong to the ^(5)D_(0)→^(7)F_(2) transition of Eu^(3+)ions.The optimum doping concentration of Eu^(3+)in LiBi(WO_(4))_(2) was 11 mol%.In LiBi(WO_(4))_(2),the main mechanism of Eu^(3+)induced quenching is adjacent ion exchange.However,the excited state dynamic experiments showed that no obvious concentration quenching phenomenon occured even when the doping concentration of Eu^(3+)reached 14 mol%.Moreover,the obtained phosphors have the features of good color saturation and low colorant temperature,and are potential excellent red phosphors material for white LEDs.
作者
祝方顺
韩佳力
罗文钦
ZHU Fangshun;HAN Jiali;LUO Wenqin(School of Science and Technology,Huzhou College,Huzhou 313000,China)
出处
《湖州师范学院学报》
2022年第8期32-39,共8页
Journal of Huzhou University
基金
中科院光电材料化学与物理重点实验室开放基金项目(2008DP173016)
湖州市科技计划公益项目(2017GY02).
