CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Effect of Mg and Fe Doping on Optical Absorption of LiNbO3 Crystal through First Principles Calculations |
HUANG Duo-Hui, YANG Jun-Sheng, CAO Qi-Long, WAN Ming-Jie, LI Qiang, SUN Liang, WANG Fan-Hou** |
Computational Physics Key Laboratory of Sichuan Province, Yibin University, Yibin 644007
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Cite this article: |
HUANG Duo-Hui, YANG Jun-Sheng, CAO Qi-Long et al 2014 Chin. Phys. Lett. 31 037103 |
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Abstract Using first principles calculations, we investigate the structural, optical, and electronic properties of LiNbO3 (LN) and M doped LN (M=Mg, Fe). The density of states are calculated to analyze the effect of doping Mg and Fe ions on the absorption spectra and electronic properties of LN. The results show an ultraviolet shift in the optical absorption edge of Mg-doped LN compared with that of intrinsic LN. On the contrary, the absorption edge of Fe-doped LN crystal reveals a red shift. The optical absorption spectra show an improved optical response in the visible range for Mg-doped LN, which significantly differs from that obtained for Fe-doped LN. The electronic excitations from the valence band to the conduction band of LN leads to an improved optical absorption response in the visible region as observed experimentally. The obvious changes of the doped LN crystal are found in some cases, which provide a helpful guide for preparing doped LN crystal.
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Received: 12 November 2013
Published: 28 February 2014
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PACS: |
71.20.Nr
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(Semiconductor compounds)
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71.15.Ap
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(Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.))
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71.55.Eq
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(III-V semiconductors)
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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