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Photoluminescence and EPR of In‐Doped ZnO Superlattice Nanorods
Author(s) -
Yang Qianhui,
Lou Liren,
Wang Guanzhong
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201700651
Subject(s) - electron paramagnetic resonance , nanorod , photoluminescence , materials science , photoexcitation , doping , annealing (glass) , superlattice , paramagnetism , analytical chemistry (journal) , photochemistry , optoelectronics , nuclear magnetic resonance , nanotechnology , chemistry , condensed matter physics , excited state , atomic physics , physics , chromatography , composite material
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 fromV Zn −and I n Zn 0defects, 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 ofV Zn −and I n Zn 0are in paramagnetic charge state, and a two‐charge‐state model is suggested to interpret the photoexcitation kinetic of V Zn involved.