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

Bulletin of the Korean chemical society

Hyo Sung Lee¹  Sung Il Oh¹  Jun Gill Kang¹  Kwang Bok Kim¹ 

关键词: ZnS:Ag;    Al;    Cl;    ZnS:Cu;    Al;    Metal oxide coating;    Cathodoluminescence;    Aging degradation;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

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.

【 授权许可】

Unknown