SiO2-coated ZnS submicrospheres with enhanced thermal stability and photoluminescence

✍ Scribed by Haiyan Song; Young-Min Leem; Byoung-Gyu Kim; Yeon-Tae Yu

• Book ID: 104063719
• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 750 KB
• Volume: 143
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2007.07.008

✦ Synopsis

Uniform SiO 2 -coated ZnS submicrospheres were synthesized by a sol-gel method. The shell thickness was controlled from 50 to 320 nm by adjusting the concentration of tetraethyl orthosilicate (TEOS). The structure and morphology of the SiO 2 -coated ZnS spheres were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results indicate that the thermal stability of SiO 2 -coated ZnS spheres has been greatly improved comparing with the uncoated ZnS. The emission intensity of SiO 2 -coated ZnS submicrospheres increased greatly with increasing the SiO 2 -shell thickness, which can be ascribed to the improved thermal stability and reduced surface defects and electron-hole recombination of ZnS spheres.