Microwave synthesis of manganese-ion-doped zinc sulfide nano-phosphors using a novel monomer
Resource
JOURNAL OF ALLOYS AND COMPOUNDS,475,116-121.
Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Journal Issue
475
Pages
116-121
Date Issued
2008
Date
2008
Author(s)
Abstract
ZnS:Mn2+ nano-phosphors are synthesized via a microwave irradiation technique using zinc 2-ethylhexanoate as a novel zinc precursor. The developed process produces ZnS:Mn2+ nano-particles having in situ capping of 2-ethylhexanoic acid on the surface, resulting in high luminescence intensity due to effective surface passivation. Surface characterization of the nano-particles indicates that 2-ethylhexanoic acid is chemisorbed as carboxylate onto the surface of ZnS:Mn2+ nano-particles and the two oxygen atoms in the carboxylate are coordinated symmetrically to the Zn atoms, leading to the formation of the covalent Zn-O bond. The anion bound onto the nano-particle surface prevents particle agglomeration due to electrostatic repulsion between two adjacent particles. Electron spin resonance (ESR) spectrum showed a hyperfine sextet revealing the fact that Mn2+ in ZnS was present as dispersed Mn2+ impurities rather than Mn2+ clusters, which would produce broad resonance without splitting. The samples showed bright yellow-orange luminescence at about 585 nm, characteristic of 4T1 (excited) → 6A1 (ground) transition of Mn2+ ion at Td symmetry in ZnS. © 2008 Elsevier B.V. All rights reserved.
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journal article
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