Eu~(3+)掺杂浓度对NaYF_4:Eu~(3+)晶体荧光强度的影响

在乙醇和乙二醇的混合溶剂中,用溶剂热法,150℃,反应12 h,成功合成了NaYF4:Eu3+晶体。室温下,用X射线衍射对材料的组成进行了表征,JCPDS号为16-0334。荧光光谱分析表明,在395 nm(7F0→5L4)紫外光激发下,其发射峰在476 nm、540~578 nm、718 nm分别对应着Eu3+的5DJ(J=0,1,2,3)→7FJ(J=1,2,3,4)能级跃迁。并讨论了离子Y3+:Eu3+不同浓度掺杂比对荧光性质的影响。结果表明,Eu3+的最佳掺杂浓度比为5%,当掺杂浓度为10%时,出现荧光猝灭。

The Effect of Doped Eu3+Ion Concentration on Fluorescent Properties of NaYF4:Eu3+Crystals

The NaYF4：Eu3＋crystals were prepared in the mixed solvents of ethanol and glycol , at 150 ℃ for 12 h using solvothermal method.The obtained samples were characterized by X -ray power diffraction （ XRD） and fluorescent spectra.The result showed that the emission peaks of the prepared crystals locate at 476 nm, 540~578 nm, 718 nm in according with 5DJ （J=0, 1, 2, 3） →7FJ （J=1, 2, 3, 4） transitions of Eu3＋ions under excitation of 395 nm.Moreover, the influence of different molar rate of Y 3＋： Eu3＋to the fluorescent intensity was discussed.The experiment results showed that the optimum doping concentration of Eu 3 ＋was 5% and fluorescence quenching appeared when the doping ions of Eu 3＋was 10%.