Photoluminescence in wide band gap corundum Mg4Ta2O9 single crystals

Liang Li; Yu-Lu Zheng; Yu-Xin Hu; Fang-Fei Li; Qiang Zhou; Tian Cui

doi:10.1088/1674-1056/ab8a3d

Journals >Chinese Physics B >Volume 29 >Issue 8 >Page > Article

Chinese Physics B
Vol. 29, Issue 8, (2020)

Photoluminescence in wide band gap corundum Mg₄Ta₂O₉ single crystals

Liang Li, Yu-Lu Zheng, Yu-Xin Hu, Fang-Fei Li, Qiang Zhou^†, and Tian Cui

Author Affiliations

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130000, China

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DOI: 10.1088/1674-1056/ab8a3d Cite this Article

Liang Li, Yu-Lu Zheng, Yu-Xin Hu, Fang-Fei Li, Qiang Zhou, Tian Cui. Photoluminescence in wide band gap corundum Mg₄Ta₂O₉ single crystals[J]. Chinese Physics B, 2020, 29(8): Copy Citation Text

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Abstract

As is well known, the basic intrinsic properties of materials can be significant for their practical applications. In this work, the room-temperature absorption, transmittance, reflectance spectra, and relative photoelectricities parameters of the Mg4Ta2O9 crystals are demonstrated. Meanwhile, the polarized Raman spectra of Mg4Ta2O9 crystals are also described. The room-temperature photoluminescence (PL) and the temperature-dependent PL for Mg4Ta2O9 crystals are obtained. Significantly, we observe a phonon-participated PL process in Mg4Ta2O9.

Keywords

band gap energy corundum photoelectric polarized Raman ultraviolet emission

$$ \begin{eqnarray}\alpha h\nu ={(h\nu -{E}_{{\rm{g}}})}^{k},\end{eqnarray}$$

(1)

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$$ \begin{eqnarray}T=\displaystyle \frac{{(1-R)}^{2}\exp (-\alpha d)}{1-{R}^{2}\exp (-2\alpha d)},\end{eqnarray}$$

(2)

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$$ \begin{eqnarray}K=\displaystyle \frac{\alpha \lambda }{4\pi },\,\,\,\,\,\,R=\displaystyle \frac{{(n-1)}^{2}+{K}^{2}}{{(n+1)}^{2}+{K}^{2}},\end{eqnarray}$$

(3)

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$$ \begin{eqnarray}{\varepsilon }_{{\rm{i}}}=2nK,\,\,\,\,\,\,{\varepsilon }_{{\rm{r}}}={n}^{2}-{K}^{2},\end{eqnarray}$$

(4)

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$$ \begin{eqnarray}n(E)={n}_{0}+{a}_{1}{E}^{2},\end{eqnarray}$$

(5)

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$$ \begin{eqnarray}{\varepsilon }_{{\rm{r}}}=1+\displaystyle \frac{F}{({E}_{0}^{2}+{E}^{2})},\end{eqnarray}$$

(6)

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$$ \begin{eqnarray}{E}_{{\rm{d}}}=F/{E}_{0},\end{eqnarray}$$

(7)

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$$ \begin{eqnarray}{\varepsilon }_{{\rm{r}}}(E)={n}^{2}(E)=1+\displaystyle \frac{{E}_{{\rm{d}}}{E}_{0}}{({E}_{0}^{2}-{E}^{2})}.\end{eqnarray}$$

(8)

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$$ \begin{eqnarray}\begin{array}{c}{A}_{1{\rm{g}}}=\left(\begin{array}{ccc}a & 0 & 0\\ 0 & a & 0\\ 0 & 0 & b\end{array}\right),\,\,\,{E}_{{\rm{g}},1}=\left(\begin{array}{ccc}c & 0 & 0\\ 0 & -c & d\\ 0 & d & 0\end{array}\right),\\ {E}_{{\rm{g}},2}=\left(\begin{array}{ccc}0 & -c & -d\\ -{\rm{c}} & 0 & 0\\ -d & 0 & 0\end{array}\right).\end{array}\end{eqnarray}3$$

()

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Liang Li, Yu-Lu Zheng, Yu-Xin Hu, Fang-Fei Li, Qiang Zhou, Tian Cui. Photoluminescence in wide band gap corundum Mg₄Ta₂O₉ single crystals[J]. Chinese Physics B, 2020, 29(8):

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