水热法合成NaYF_4∶Er^(3+)/Pr^(3+)上转换发光性能

Hydrothermal synthesis and up-conversion luminescent property of rare earth fluoride NaYF_4∶Er^(3+)/Pr^(3+) material

以氟化钠、硝酸钇、硝酸铒、硝酸镨为原料,采用水热法合成了NaYF4∶Er3+/Pr3+上转换荧光粉。利用X射线粉末衍射(XRD),场发射扫描电子显微镜(SEM)、荧光光谱(PL)等方法对产物的形貌、结构和发光性能进行表征。结果表明,NaYF4∶Er3+/Pr3+粉体外观主要是六边棱柱,属于六方晶系,具有P63/m(176)空间点群结构。在980nm激光激发下表现出了强的上转换发光性能。其中波长520.5nm和539nm位置为绿光发射,在652m位置为红光发射,分别对应的是Er3+离子的2 H11/2→4 I15/2、4 S3/2→4 I15/2跃迁发射和4 F9/2→4 I15/2跃迁发射。Pr3+上电子向Er3+的能量迁移提高了发光强度。

Rare earth fluoride NaYF4 ： Er3＋/Pr3. luminescent material was synthesized by hydrothermal method using sodium fluoride, yttrium nitrate, erbium nitrate as raw materials. The structure of obtained samples were characterized by X-ray powder diffraction （XRD）, scanning electron microscopy （SEM）. The emission spectrums were measured by fluo- rescence spectrometer. The results showed that NaYF4 ：Er3＋/Pr3＋ was mainly hexagonal crystal system with P63/m（176） points of space. Under continuous-wave excitation of 980nm laser,the NaYF4 ：Er3＋ and NaYF4 ： Er3＋/Pr3＋ samples exhibi- ted strong up conversion light. The green emission （from Er3＋ , at 520.5nm2 Hll/2 →4 I15/2 and 4 S3/2 →4 I51/2 at 539nm）, the red emission from Er3＋ 4F9/2→4 I15/2 at 652nm. At the same time, the electronic energy migration from Pr3＋ to Er3＋ im- proved the luminous intensity.