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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 12
BKCSDE 31(12)
December 20, 2010 

Protective Metal Oxide Coatings on Zinc-sulfide-based Phosphors and their Cathodoluminescence Properties
Sung Il Oh, Hyo Sung Lee, Kwang Bok Kim, Jun Gill Kang*
ZnS:Ag,Al,Cl, ZnS:Cu,Al, Metal oxide coating, Cathodoluminescence, Aging degradation
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 (SiO2, Al2O3, and MgO). Hydrolysis of the metal oxide precursors tetraethoxysilane, aluminum isopropoxide, and magnesium nitrate, with subsequent heat annealing at 400 oC, produced SiO2 nanoparticles, an Al2O3 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 SiO2 and the Al2O3 coverages were ineffective in improving aging degradation.
3723 - 3729
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