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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

Title	Protective Metal Oxide Coatings on Zinc-sulfide-based Phosphors and their Cathodoluminescence Properties
Author	Sung Il Oh, Hyo Sung Lee, Kwang Bok Kim, Jun Gill Kang*
Keywords	ZnS:Ag,Al,Cl, ZnS:Cu,Al, Metal oxide coating, Cathodoluminescence, Aging degradation
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 (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.
Page	3723 - 3729
Full Text	PDF

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