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Surface exciton emission of MgO crystals
Kuang, WJ; Li, Q; Chen, YX; Hu, K; Wang, NH; Xing, FL; Yan, Q; Sun, SS; Huang, Y; Tao, Y; Tolner, H;孙帅帅; Huang Y(黄艳); Tao Y(陶冶)
AbstractMgO crystals have been exposed to vacuum ultraviolet (VUV) radiation from a synchrotron, with energies up to 9 eV, and the emitted light, at wavelengths above 200 nm, was observed. It is concluded that bulk excitons, play an important role in the diffusion of energy inside MgO crystals, resulting in 5.85 eV (212 nm) emission from the MgO terraces of large (0.2-2 mu m) MgO: F crystals. In the case of aliovalent impurity doping, then the bulk exciton energy is also transferred to the V-k centres and 5.3 eV (235 nm) light is emitted. Both fluorine and silicon doping appear to promote UV surface emission, acting similarly to an ns2 ion inside MgO, while strong scandium doping is killing the surface emission completely. The 212 nm surface UV emission and the 235 nm bulk UV emission can be excited only at the bandgap edge. Broadband visible light, centred around 400 nm, is also emitted. Contrary to the UV emission, this is not generated when excited at the bandgap edge; instead, we find that it is only excited at sub-bandgap energies, with a maximum at the 5C surface excitation energy of 5.71 eV (217 nm) for the MgO terraces.
Subject AreaPhysics
Indexed BySCI ; ADS
WOS IDWOS:000323608600016
ADS Bibcode2013JPhD...46J5501K
ADS URLhttps://ui.adsabs.harvard.edu/abs/2013JPhD...46J5501K
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2013JPhD...46J5501K/citations
Citation statistics
Cited Times:3 [ADS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Kuang, WJ,Li, Q,Chen, YX,et al. Surface exciton emission of MgO crystals[J]. JOURNAL OF PHYSICS D-APPLIED PHYSICS,2013,46(36):365501.
APA Kuang, WJ.,Li, Q.,Chen, YX.,Hu, K.,Wang, NH.,...&陶冶.(2013).Surface exciton emission of MgO crystals.JOURNAL OF PHYSICS D-APPLIED PHYSICS,46(36),365501.
MLA Kuang, WJ,et al."Surface exciton emission of MgO crystals".JOURNAL OF PHYSICS D-APPLIED PHYSICS 46.36(2013):365501.
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