摘要
采用高温固相法,制备了一系列NaLa1-xDyxMgWO_(6)荧光粉。考察了Dy^(3+)离子掺杂浓度对荧光粉物相和发光性质的影响。并将所制得的荧光粉在800℃进行热处理,对比分析热处理前后的发光性质变化,探讨不同掺杂离子浓度样品的热稳定性。采用X射线衍射、荧光分光光度计对其进行表征。实验结果表明:在1100℃温度下保温4 h,可以制备得到NaLaMgWO_(6)单相,Dy^(3+)的掺入未改变荧光粉基质的物相结构。在389 nm波长激发下,NaLaMgWO_(6):Dy^(3+)表现出Dy^(3+)的^(4)F_(9/2)→^(6)H_(13/2)的特征发射,属于Dy^(3+)的黄色发射。随着掺杂离子浓度的增大,其发射强度先增大后降低,当Dy^(3+)掺杂的原子百分数为8%时,NaLa_(0.92)Dy_(0.08)MgWO_(6)荧光粉表现出最好的发射强度。在800℃热处理后,荧光粉的发光性质在最佳浓度处有所增强,表明其具有较好的热稳定性。NaLa_(0.92)Dy_(0.08)MgWO_(6)荧光粉是一种能应用于白色发光二极管的潜在黄色发射荧光粉。
A series of NaLa1-xDyxMgWO_(6)phosphors were prepared by the high-temperature solid-phase method.The effects of Dy^(3+)-doped concentration on the physical phase and luminescence properties of the phosphors were investigated.And the thermal stability on luminescence properties was evaluated after the phosphors were heat-treated at 800℃.The crystal phases and luminescence properties of NaLa1-xDyxMgWO_(6)phosphors were characterized by X-ray diffraction and fluorescence spectroscopy,respectively.The experimental results show that the single phase of NaLaMgWO_(6)can be obtained at 1100℃for 4 h,and the crystal phase is not altered by the doping of Dy^(3+).The NaLaMgWO_(6):Dy^(3+)phosphors exhibit yellow characteristic emission of Dy^(3+)under excitation of 389 nm wavelength.The emission intensity increases first and then decreases with the increase of Dy^(3+)concentration.When the atom percent of doped Dy^(3+)is 8%,the NaLa_(0.92)Dy_(0.08)MgWO_(6)phosphors exhibit the strongest emission intensity.The luminescence properties of the phosphors are enhanced at the optimal concentration after heat treatment at 800℃,indicating a good thermal stability.NaLa_(0.92)Dy_(0.08)MgWO_(6)phosphors can be applied as yellow-emitting materials in white light emitting diode.
作者
王喆
周诗晖
张占辉
黄志良
WANG Zhe;ZHOU Shihui;ZHANG Zhanhui;HUANG Zhiliang(School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China)
出处
《武汉工程大学学报》
CAS
2023年第4期413-417,共5页
Journal of Wuhan Institute of Technology
基金
国家自然科学基金(52172227)
武汉工程大学第十四届研究生教育创新基金(CX2022229)。
作者简介
王喆,硕士研究生。E-mail:1114768520@qq.com;通讯作者:张占辉,博士,教授。E-mail:zzhlzu@163.com。
