Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3543840
Title: Defect dynamics and spectral observation of twinning in single crystalline LaAlO3 under subbandgap excitation
Authors: Chen, J.Q.
Wang, X.
Lu, Y.H. 
Roy Barman, A.
You, G.J. 
Xing, G.C.
Sum, T.C.
Dhar, S. 
Feng, Y.P. 
Ariando 
Xu, Q.-H. 
Venkatesan, T. 
Issue Date: 24-Jan-2011
Citation: Chen, J.Q., Wang, X., Lu, Y.H., Roy Barman, A., You, G.J., Xing, G.C., Sum, T.C., Dhar, S., Feng, Y.P., Ariando, Xu, Q.-H., Venkatesan, T. (2011-01-24). Defect dynamics and spectral observation of twinning in single crystalline LaAlO3 under subbandgap excitation. Applied Physics Letters 98 (4) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3543840
Abstract: We have investigated the photoluminescence and ultrafast dynamics of LaAlO3 crystal. The photoluminescence consists of a broad spectrum and two sharp peaks, which arise from various defect levels within the bandgap. A doublet splitting of roughly 6 nm is seen in these two sharp peaks. An Al displacement of 0.09 Å in a sublattice, which is possible because of twinning, is adequate to explain the spectral splitting. Femtosecond pump probe experiments reveal further that many of these defect levels have a few picosecond decay times while the lowest defect states have decay times longer than nanosecond to the valence band. © 2011 American Institute of Physics.
Source Title: Applied Physics Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/82117
ISSN: 00036951
DOI: 10.1063/1.3543840
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