White light emission from transparent SiO2 glass prepared from nanometer-sized silica particles

Uchino, Takashi; Yamada, Tomoko
August 2004
Applied Physics Letters;8/16/2004, Vol. 85 Issue 7, p1164
Academic Journal
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 ∼400 to ∼700 nm 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.


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