Laser excited novel near-infrared photoluminescence bands in fast neutron-irradiated MgO·nAl2O3

Rahman, A.Z.M.S. and Haseeb, A.S. Md. Abdul and Xu, Q. and Evslin, J. and Cinausero, M. (2016) Laser excited novel near-infrared photoluminescence bands in fast neutron-irradiated MgO·nAl2O3. Radiation Physics and Chemistry, 125. pp. 122-126. ISSN 0969-806X, DOI

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New near-infrared photoluminescence bands were observed in neutron-irradiated spinel single crystal upon excitation by a 532 nm laser. The surface morphology of the unirradiated and fast neutron-irradiated samples was investigated using atomic force microscopy and scanning probe microscopy. Fast neutron-irradiated samples show a strong emission peak at 1685 nm along with weak bands at 1065 and 2365 nm. The temperature dependence of the photoluminescence intensity was also measured. At lower temperatures, the dominant peak at 1685 nm shifts toward lower energy whereas the other peaks remain fixed. Activation energies of luminescence quenching were estimated to be 5.7 and 54.6 meV for the lower and higher temperature regions respectively.

Item Type: Article
Funders: Chinese Academy of Sciences Fellowships for Young International Scientists under Grant no. 2012Y1JB0007, HIR grant, UM from Ministry of Higher Education, Malaysia (Project no. UM.C/625 /1/HIR/ MOHE/ENG/26), National Science Foundation of China MianShang Grant 11375201
Uncontrolled Keywords: Near-infrared photoluminescence; Point defects; Neutron-irradiation; MgO·nAl2O3
Subjects: Q Science > QC Physics
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 05 Jul 2017 06:42
Last Modified: 17 Oct 2018 00:41

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