Cao Shiwei, Jiao Yang, Han Weifang, Ge Chunhua, Song Bo, Wang Jie, Zhang Xiangdong
College of Chemistry, Liaoning University, Shenyang 110036, China.
College of Chemistry, Liaoning University, Shenyang 110036, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Feb 5;190:231-238. doi: 10.1016/j.saa.2017.09.040. Epub 2017 Sep 18.
4ZnO·BO·HO:Ln (Ln=Eu, Tb) phosphors with different morphologies have been successfully synthesized via one-step hydrothermal method through regulating the molar amount of Eu and Tb. Comprehensive scanning electron microscopy (SEM), X-ray diffraction (XRD) Fourier transform infrared spectrum (FT-IR) and inductively coupled plasma atomic emission spectrometer (ICP-AES) characterizations all confirm that obtained products are 4ZnO·BO·HO:Ln (Ln=Eu, Tb). The experimental results displayed that the morphology and photoluminescence of compounds is regularly changed with increased the molar amount of rare earth ions. For the Eu-doped, Tb-doped and Eu/Tb co-doped 4ZnO·BO·HO phosphors of morphologies, the rod-like structures gradually changed to flower-like structures, fine wire-like structure and hybrid structure, respectively. To their photoluminescence, the Eu shows a red emission (615nm); the Tb shows a green emission (545nm); for the Eu/Tb co-doped 4ZnO·BO·HO phosphors, a combination of blue (5d-4f of Eu), green (D-F of Tb) and red (D-F of Eu) emissions emerges to achieve white emission. In addition, the energy transfer among Eu, Eu and Tb ions was also discussed.
通过调节铕（Eu）和铽（Tb）的摩尔量，采用一步水热法成功合成了具有不同形貌的4ZnO·BO·HO:Ln（Ln = Eu, Tb）荧光粉。综合扫描电子显微镜（SEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）和电感耦合等离子体原子发射光谱仪（ICP-AES）表征均证实所获得的产物为4ZnO·BO·HO:Ln（Ln = Eu, Tb）。实验结果表明，随着稀土离子摩尔量的增加，化合物的形貌和光致发光发生有规律的变化。对于形貌为棒状结构的Eu掺杂、Tb掺杂和Eu/Tb共掺杂的4ZnO·BO·HO荧光粉，其结构分别逐渐变为花状结构、细丝状结构和混合结构。就其光致发光而言，Eu呈现红色发射（615nm）；Tb呈现绿色发射（545nm）；对于Eu/Tb共掺杂的4ZnO·BO·HO荧光粉，出现了蓝色（Eu的5d-4f）、绿色（Tb的D-F）和红色（Eu的D-F）发射的组合以实现白色发射。此外，还讨论了Eu、Eu和Tb离子之间的能量转移。
