Laser excited novel near-infrared photoluminescence bands in fast neutron-irradiated MgO·nAl2O3
Document Type
Article
Publication Date
1-1-2016
Abstract
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.
Keywords
Near-infrared photoluminescence, Point defects, Neutron-irradiation, MgO·nAl2O3
Divisions
fac_eng
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
Publication Title
Radiation Physics and Chemistry
Volume
125
Publisher
Elsevier