White light emission from transparent SiO2 glass prepared from nanometer-sized silica particles
Takashi UchinoDepartment of Chemistry , Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan and , Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, JapanTomoko YamadaDepartment of Chemistry , Graduate School of Science and Technology, Nada-ku, Kobe 657-8501, Japan
2004en
ABI
Abstract
We report that nanometer-sized silicon-dioxide particles are sintered to optical transparency at temperatures even below 1000°C, forming nonporous bulk silica glass. The resultant silica glass exhibits visible emission, which appears white to the naked eye, in the wavelength range from ∼400to∼700nm at room temperature under ultraviolet excitation. The observed emission is quite stable after prolonged exposure to the atmosphere and shows no appreciable light-induced degradation. The present photoluminescence characteristics are found to be basically different from those reported previously for silica nanoparticles and silica-based porous materials.
Identifiers
Citations and references
Cited by 40 references