Microwave synthesis of manganese-ion-doped zinc sulfide nano-phosphors using a novel monomer

作者：Lu Chung Hsin^*; Bhattacharjee Baibaswata; Chen Shih Yen

来源：Journal of Alloys and Compounds, 2009, 475(1-2): 116-121.

DOI：10.1016/j.jallcom.2008.08.042

• Nano-particles
• ZnS:Mn(2 )
• Luminescence
• Microwave synthesis

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 585 nm, characteristic of (4)T(1) (excited) -> (6)A(1) (ground) transition of Mn(2 ) ion at T(d) symmetry in ZnS.

• 出版日期2009-5-5