采用高温溶剂热法合成了 Eu3+掺杂的双频转换发光材料β-NaYF4∶20%Yb3+,0.5%Tm3+,并使用 X射线衍射仪(XRD)、场发射扫描电镜(FESEM)和光致发光谱(PL)仪对所制备样品的物相结构、形貌特征和发光性质进行了表征,通过分析发光原理,解释了上、下转换发光的竞争机制,并探讨了稀土离子 Tm3+与 Eu3+之间的能量转移。结果表明：所合成的β-NaYF4∶20%Yb3+,0.5%Tm3+,xEu3+为纯六方相晶体,结晶良好,颗粒尺寸在200 nm左右。改变 Eu3+的掺杂浓度后晶格结构没有发生明显变化,样品可在394 nm 和980 nm 光的激发下,分别发生下转换和上转换发光。
Dual-frequency light conversion material β-NaYF4 ∶ 20% Yb3 + ,0.5% Tm3 + doped with Eu3 + was prepared via high temperature solvothermal method.Their phase morphology and luminescent properties were charac-terized by X-ray diffraction (XRD),field emission scanning electron microscopy (FESEM)and photoluminescence (PL)spectra,respectively.Furthermore,the principle and competition mechanism of up/down-conversion lumines-cence were analyzed.The energy transfer between Tm3 + and Eu3 + was discussed.It could be found that the as-pre-paredβ-NaYF4 ∶20%Yb3 + ,0.5%Tm3 + ,xEu3 + had a good crystallinity with hexagonal phase,and its particle size was about 200 nm.When the doping concentration of Eu3 + to Yb3 + and Tm3 + was varied,the lattice structure of sam-ples changed little.The new material showed down-conversion or up-conversion luminescence under excitation of 394 nm and 980 nm light,respectively.
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