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Photoluminescence and EPR of In‐Doped ZnO Superlattice Nanorods

Yang, Qianhui (Key Laboratory of Strongly‐Coupled Matter Physics, Chinese Academy of Sciences, Hefei National Laboratory for Physical Science at Microscale, and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China ) ; Lou, Liren (Key Laboratory of Strongly‐Coupled Matter Physics, Chinese Academy of Sciences, Hefei National Laboratory for Physical Science at Microscale, and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China ) ; Wang, Guanzhong (Key Laboratory of Strongly‐Coupled Matter Physics, Chinese Academy of Sciences, Hefei National Laboratory for Physical Science at Microscale, and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China ) ;
  • 초록  

    In 2 O 3 (ZnO) m (IZO) superlattice nanorods are synthesized via a chemical vapor transport method. By comparing the photoluminescence (PL) and electron paramagnetic resonance (EPR) spectral changes of the IZO nanorods under different annealing atmospheres, it is found that the deep level emissions could be attributed to V Zn / V Zn ‐related acceptor defects ( V Zn ‐R), or O i /O i ‐R defects. The EPR spectrum of the IZO nanorods shows two EPR signals in a region near g ≈1.96, i.e., at g = 1.9524 and 1.9443, which come from VZn− and InZn0 defects, respectively. The intensities of the g ≈1.96 lines gradually decrease after continuous illumination by white light, and increase to their starting value after the light is switched off, showing a well‐reversible process. The EPR signal change under illumination reveals that initially the defects of VZn− and InZn0 are in paramagnetic charge state, and a two‐charge‐state model is suggested to interpret the photoexcitation kinetic of V Zn involved.


  • 주제어

    electron paramagnetic resonance .   indium‐doped ZnO .   nanorods .   optical properties .   superlattices.  

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