Structure refinement and one-center luminescence of Eu3+ activated ZnBi2B2O7 under UV excitation
Structure refinement and one-center luminescence of Eu3+ activated ZnBi2B2O7 under UV excitation
复制标题
DOI：
10.1016/j.jallcom.2015.06.187
复制
发表时间：
2015-11
影响因子：
6.2
通讯作者：
Liwei Wu;Fangxin Zhang;Li Wu;H. Yi;Hongrun Wang;Yi Zhang;Y. Kong;Jingjun Xu
中科院分区：
文献类型：
--
作者：
Liwei Wu;Fangxin Zhang;Li Wu;H. Yi;Hongrun Wang;Yi Zhang;Y. Kong;Jingjun Xu
采用高温固相反应法合成了一系列Eu 3+激活的ZnBi 2B 2 O 7：xEu 3+红色荧光粉。通过对粉末X射线衍射（XRD）数据的Rietveld修正，研究了Eu 3+在ZnBi 2B 2 O 7基质中的局域晶体环境。细化结果表明，Eu ~（3+）的掺杂没有改变基质结构。虽然有两种不同的阳离子位置，但掺杂的Eu 3+倾向于占据Zn位而不是Bi位。这表明当Eu 3+掺杂到ZnBi 2B 2 O 7中时，只有一个发光中心，ZnBi 2B 2 O 7：xEu 3+的发光性能进一步证实了这一点。沿着讨论了掺杂浓度和激发波长对Eu ~（3+）在ZnBi_2B_2 O_7中的单中心发光的影响，并分析了Eu ~（3+）的衰减特性。由温度相关的光致发光谱可知，发光强度随温度的升高而快速下降是由于非辐射弛豫。
A series of Eu3+-activated red phosphors ZnBi2B2O7:xEu3+were synthesized by high temperature solid-state reaction method. Rietveld refinement on the powder X-ray diffraction (XRD) data was performed to study the local crystal environment of Eu3+in ZnBi2B2O7host. The refinement results disclose that the doped Eu3+do not change the host structure. Although two different cation sites are available, the doped Eu3+is inclined to occupy Zn site instead of Bi site. This indicates that there is only one luminescent center when Eu3+is doped into ZnBi2B2O7phosphor, which is further confirmed by the luminescence properties of ZnBi2B2O7:xEu3+. The influences of the doping concentration and the excitation wavelength on the one-center luminescence of Eu3+in ZnBi2B2O7are discussed along with the decay characteristics. Based on the temperature-dependent PL spectra, the fast decrease of emission intensity with the increase of temperature is due to the non-radiative relaxation.