Wang Yuping, Li Mingxia, Pan Kai, Li Rong, Fan Naiying, Wang Guofeng
J Nanosci Nanotechnol. 2016 Apr;16(4):3617-21. doi: 10.1166/jnn.2016.11852.
Rhombic NaLa(MoO4)2:Ln3+ (Ln = Eu and Tb) nanocrystals were synthesized by a hydrothermal method. The structures and morphologies of the nanocrystals were characterized by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy. The results indicated that the crystalline size increased with increasing Na2MoO4 content. The photoluminescence properties of NaLa(MoO4)2:Ln3+ nanocrystals were investigated in detail. In the emission spectra of NaLa(MoO4)2:Eu3+ nanocrystals, the 5D0 --> 7F2 is dominant, and the peak positions and spectral shapes of emissions were independent of Eu3+ concentration. The luminescence intensity increased with increasing Eu3+ concentration, up to about 10 mol%, and then decreased. In the emission spectra of NaLa(MoO4)2:Tb3+ nanocrystals, the 5D4 --> 7F5 is dominant. The sample with a dopant concentration of 20 mol% showed the highest emission intensity.
通过水热法合成了菱形NaLa(MoO4)2:Ln3+（Ln = Eu和Tb）纳米晶体。采用X射线衍射、拉曼光谱和扫描电子显微镜对纳米晶体的结构和形貌进行了表征。结果表明，晶体尺寸随Na2MoO4含量的增加而增大。详细研究了NaLa(MoO4)2:Ln3+纳米晶体的光致发光性能。在NaLa(MoO4)2:Eu3+纳米晶体的发射光谱中，5D0→7F2为主导，发射峰位置和光谱形状与Eu3+浓度无关。发光强度随Eu3+浓度增加而增大，直至约10 mol%，然后降低。在NaLa(MoO4)2:Tb3+纳米晶体的发射光谱中，5D4→7F5为主导。掺杂浓度为20 mol%的样品发射强度最高。
