Journal
JOURNAL OF LUMINESCENCE
Volume 131, Issue 7, Pages 1336-1339Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2011.03.026
Keywords
Eu-doped ZnS nanowires; Thermal quenching; Surface/volume ratio; Luminescence
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Funding
- Ministry of Education. Science and Technology [2010-0019108, 2010K000990]
- Korea government (MEST) [2010-0000131]
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Optical properties and temperature-dependent quenching behaviors of emission from undoped and Eu-doped ZnS nanowires (NWs) were characterized. Electron paramagnetic resonance measurements confirmed the presence of the dopant in valence state Eu(2+). The 368 nm (3.37 eV) near-band-edge emission band associated with dissociation of a bound exciton was found to have an activation energy of 27.3 meV. A dopant-related transition was observed from both samples due to the incorporation of unintentional Au catalyst in the undoped NWs and of intentional Eu-dopant. These dopant-related transitions show large activation energy and appreciable amount of emission intensities above the room temperature. Both samples also exhibit surface-state-related transitions around 400 nm (3.046 eV) which have relatively smaller activation energies than the dopant-related transitions. (C) 2011 Elsevier B.V. All rights reserved.
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