【摘要】 为了探讨稀土Er3+与纳米ZnO基质之间的能量传递,利用化学沉淀法制备了纳米ZnO:Er3+粉体材料,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,在纳米ZnO宽的可见发射背景上,观测到了 Er3+的激发态4S3／2(5-49 nm)、 2H11／2(522 nm)和4F5／2(456 nm)的特征发射, ZnO:Er3+的紫外近带边发射与未掺杂的纳米晶ZnO的近带边发射比较,强度明显减弱,绿光深能级发射略有增强。分析了稀土Er3+ 的4S3／2、2H11／2和4F5／2激发态发射,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 powder was successfully prepared by chemical precipitation method. Photoluminescence spectrum (PL)、photoluminescence spectrum excitation(PLE) and X-ray diffraction pattern(XRD) of 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 polycrystalline. The mean grain size of nanocrystalline ZnO:Er3+ was calculated by Debye-Scherrer formula. The luminescence process of Er3+-doped zinc oxide nanocrystalline has investigated by using PL and PLE. Emission of S3/2(549 nm) , 2H11/2(522 nm) and 4F5/2(456 nm)of Er3+ ions were observed in wide visible band of ZnO. Spectrum effect of Er3+ -doped on luminescence of ZnO was analyzed. An energy transferred from excited states of ZnO hosts to doped Er3+ ions centers is disclosed by the fact that the band-edge emission intensity of ZnO:Er3+ versus ZnO.更多还原