【摘要】 为了探讨稀土Er3+与纳米ZnO基质之间的能量传递,利用化学方法制备了ZnO∶Er3+纳米晶,测量了样品的X射线衍射谱(XRD)、光致发光谱(PL)和激发谱(PLE)。X射线衍射结果表明,ZnO∶Er3+具有六角纤锌矿晶体结构。室温下,在365 nm激发下,在ZnO宽的可见发射背景上,观测到了Er3+的激发态4S3/2(550 nm),2H11/2(521 nm)和4F5/2(456 nm)的特征发射。分析了ZnO∶Er3+纳米晶的带边发射和稀土Er3+的特征发射的峰值强度随掺Er3+浓度的变化关系,比较了ZnO∶Er3+与未掺杂的ZnO的光致发射峰值强度的变化,给出了稀土Er3+的激发态4S3/2→4I15/2,2H11/2→4I15/2和4F5/2→4I15/2的发射机制,证实了纳米ZnO基质与稀土Er3+离子之间存在能量传递。更多还原

【Abstract】 Er³⁺-doped zinc oxide nanocrystalline powders were successfully prepared by chemical precipitation method.Photoluminescence spectrum（PL）,photoluminescence spectrum excitation（PLE） and X-ray diffraction pattern（XRD） of the nanocrystalline ZnO∶Er³⁺ with excitation wavelength 365 nm were measured at room temperature.XRD pattern indicates that nanocrystalline ZnO∶Er³⁺ has a hexagonal wurtzite structure and polycrystallining.The mean grain size of nanocrystalline ZnO∶Er³⁺ was calculated with Debye-Scherrer formula.The luminescence process of Er³⁺-doped zinc oxide nanocrystalline was investigated by using PL and PLE.Emissions of S_3/2（550 nm）,（）²H_11/2（521 nm） and（）⁴F_5/2（456 nm）of Er³⁺ ions were observed in wide visible band of ZnO.By analyzing the spectrum the effect of Er³⁺-doping on the luminescence of ZnO was studied.An energy transfer from excited states of ZnO hosts to doping Er³⁺ ions centers was disclosed by the fact that photoluminescence intensity maximum of nanocrystalline ZnO∶Er³⁺changed with the doping concentration of Er³⁺.更多还原