Add time:10/01/2019         Source:infona.pl

ZnS:Mn 2+ nano-phosphors are synthesized via a microwave irradiation technique using zinc 2-ethylhexanoate as a novel zinc precursor. The developed process produces ZnS:Mn 2+ 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:Mn 2+ 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 Mn 2+ in ZnS was present as dispersed Mn 2+ impurities rather than Mn 2+ clusters, which would produce broad resonance without splitting. The samples showed bright yellow-orange luminescence at about 585nm, characteristic of 4 T 1 (excited)→ 6 A 1 (ground) transition of Mn 2+ ion at T d symmetry in ZnS.

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