Tian Bining, Zhao Jun, Tian Yue, Li Xiangping, Zhang Jinsu, Sun Jiashi, Hua Ruinian, Chen Baojiu
J Nanosci Nanotechnol. 2015 Jan;15(1):281-9. doi: 10.1166/jnn.2015.9711.
In this paper, Tm3+ and Dy3+ single- and double-doped nano-sized GdVO4 phosphors were prepared via a co-precipitation reaction. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and photoluminescence (PL) were utilized to characterize the as-prepared samples. The XRD and FE-SEM results reveal that the samples are single phase and that the average size is about 30 nm, respectively. Under 280 nm ultraviolet excitation, Dy3+ and Tm3+ single-doped nano-sized GdVO4 phosphors show the characteristic emissions of Dy3+ (4F9/2 --> 6H15/2 and 4F9/2 -*6H13/2 transitions) and Tm3+ (1G4 --> 3H6 transition), respectively. All the luminescence results from efficient energy transfer from the GdVO4 host to the doped Dy3+ and Tm3+ ions. Moreover, the interaction types for Dy3+ and Tm3+ ions in nano-sized GdVO4 host are confirmed as exchange and electrical dipole-dipole interaction by theoretical calculation. In Tm3+ and Dy3+ co-doped nanosized GdVO4 phosphors, the luminescence intensities of Dy3+ ions increase with increasing Tm3+ ion doping concentration, which suggests that energy transfer from Tm3+ to Dy3+ ions occurs. The responding luminescence mechanisms have been proposed in this paper. Finally, in order to evaluate the luminescence of Tm3+ and Dy3+ co-doped nano-sized GdVO4 phosphors, the color coordinates were calculated.
在本文中，通过共沉淀反应制备了Tm3+和Dy3+单掺杂及双掺杂的纳米尺寸GdVO4荧光粉。利用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）和光致发光（PL）对所制备的样品进行了表征。XRD和FE-SEM结果分别表明样品为单相且平均尺寸约为30 nm。在280 nm紫外激发下，Dy3+和Tm3+单掺杂的纳米尺寸GdVO4荧光粉分别显示出Dy3+（4F9/2→6H15/2和4F9/2→6H13/2跃迁）和Tm3+（1G4→3H6跃迁）的特征发射。所有发光均源于从GdVO4基质到掺杂的Dy3+和Tm3+离子的有效能量转移。此外，通过理论计算确定了纳米尺寸GdVO4基质中Dy3+和Tm3+离子的相互作用类型为交换相互作用和电偶极-偶极相互作用。在Tm3+和Dy3+共掺杂的纳米尺寸GdVO4荧光粉中，Dy3+离子的发光强度随Tm3+离子掺杂浓度的增加而增加，这表明发生了从Tm3+到Dy3+离子的能量转移。本文提出了相应的发光机制。最后，为了评估Tm3+和Dy3+共掺杂的纳米尺寸GdVO4荧光粉的发光性能，计算了色坐标。
