aKey Laboratory of Material Science and Technology for High Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People’s Republic of China
bGraduate School of the Chinese Academy of Sciences, Beijing 100039, People’s Republic of China
cKey Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
dState Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China
Received 19 August 2009;
accepted 30 September 2009.
Available online 3 October 2009.
Abstract
Cu-doped and Cu/Al-codoped high silica glasses (HSGes) are prepared by doping Cu2+ ions or codoping Cu2+ ions and Al3+ ions in porous glasses and then sintering at 1200°C in air and the reduction of Cu2+ ions is observed in Cu/Al-codoped HSGes. With increasing the Al/Cu molar ratio, the color of the samples changes from brown to colorless gradually. Strong and broad glaucous emission from the monomer and dimmer Cu+ ions are observed when exciting the colorless samples with ultraviolet light. Absorption, photoluminescence, electron spin resonance (ESR) spectra and X-ray photoelectron spectroscopy (XPS) are carried out to investigate this phenomenon. The mechanism of this change is presented.
