铽、铕共掺杂的SrLaNa(PO)F荧光粉中的能量转移和颜色可调发射
Energy transfer and color tunable emission in Tb,Eu co-doped SrLaNa(PO)F phosphors.
作者信息
Li Shuo, Guo Ning, Liang Qimeng, Ding Yu, Zhou Huitao, Ouyang Ruizhuo, Lü Wei
机构信息
Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Feb 5;190:246-252. doi: 10.1016/j.saa.2017.09.047. Epub 2017 Sep 18.
A group of color tunable SrLaNa(PO)F:Tb,Eu phosphors were prepared by conventional high temperature solid state method. The phase structures, luminescence properties, fluorescence lifetimes and energy transfer were investigated in detail. Under 369nm excitation, owing to efficient energy transfer of Tb→Eu, the emission spectra both have green emission of Tb and red emission of Eu. An efficient energy transfer occur in Tb, Eu co-doped SrLaNa(PO)F phosphors. The most possible mechanism of energy transfer is dipole-dipole interaction by Dexter's theoretical model. The energy transfer of Tb and Eu was confirmed by the variations of emission and excitation spectra and Tb/Eu decay lifetimes in SrLaNa(PO)F:Tb,Eu. The color tone can tuned from yellowish-green through yellow and eventually to reddish-orange with fixed Tb content by changing Eu concentrations. The results show that the prepared Tb, Eu co-doped color tunable SrLaNa(PO)F phosphor can be used for white LED.
采用传统高温固相法制备了一组颜色可调的SrLaNa(PO)F:Tb,Eu荧光粉。详细研究了其相结构、发光性能、荧光寿命和能量转移。在369nm激发下，由于Tb→Eu的有效能量转移，发射光谱同时具有Tb的绿色发射和Eu的红色发射。在Tb,Eu共掺杂的SrLaNa(PO)F荧光粉中发生了有效的能量转移。最可能的能量转移机制是基于德克斯特理论模型的偶极-偶极相互作用。通过SrLaNa(PO)F:Tb,Eu发射光谱和激发光谱的变化以及Tb/Eu衰减寿命证实了Tb和Eu之间的能量转移。通过改变Eu浓度，在Tb含量固定的情况下，色调可以从黄绿色经黄色最终调至红橙色。结果表明，所制备的Tb,Eu共掺杂颜色可调SrLaNa(PO)F荧光粉可用于白光发光二极管。
Zotero 插件