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http://dx.doi.org/10.5012/bkcs.2010.31.12.3723

Protective Metal Oxide Coatings on Zinc-sulfide-based Phosphors and their Cathodoluminescence Properties  

Oh, Sung-Il (Department of Chemistry, Chungnam National University)
Lee, Hyo-Sung (Department of Chemistry, Chungnam National University)
Kim, Kwang-Bok (Kumho Electric Inc.)
Kang, Jun-Gill (Department of Chemistry, Chungnam National University)
Publication Information
Bulletin of the Korean Chemical Society / v.31, no.12, 2010 , pp. 3723-3729 More about this Journal
Abstract
We investigated the high-excitation voltage cathodoluminescence (CL) performance of blue light-emitting (ZnS:Ag,Al,Cl) and green light-emitting (ZnS:Cu,Al) phosphors coated with metal oxides ($SiO_2$, $Al_2O_3$, and MgO). Hydrolysis of the metal oxide precursors tetraethoxysilane, aluminum isopropoxide, and magnesium nitrate, with subsequent heat annealing at $400^{\circ}C$, produced $SiO_2$ nanoparticles, an $Al_2O_3$ thin film, and MgO scale-type film, respectively, on the surface of the phosphors. Effects of the phosphor surface coatings on CL intensities and aging behavior of the phosphors were assessed using an accelerating voltage of 12 kV. The MgO thick film coverage exhibited less reduction in initial CL intensity and was most effective in improving aging degradation. Phosphors treated with a low concentration of magnesium nitrate maintained their initial CL intensities without aging degradation for 2000 s. In contrast, the $SiO_2$ and the $Al_2O_3$ coverages were ineffective in improving aging degradation.
Keywords
ZnS:Ag,Al,Cl; ZnS:Cu,Al; Metal oxide coating; Cathodoluminescence; Aging degradation;
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