Hyper-stable defect-induced SiO<inf>2</inf> powder materials for fluorescence performance

Abstract

Abstract: A novel defect-induced inorganic photoluminescence powder silica (CSI-SiO2) nanomaterial was successfully synthesized via a facile method, where Cs+ was doped into SiO2 by ion exchange, and oxygen vacancy defects were produced during a vacuum calcination treatment at high temperature. CSI-SiO2 was characterized by scanning electron microscopy, X-ray diffraction and photoluminescence spectroscopy. The result showed that CSI-SiO2 contained merely three elements including Cs, Si, and O. Compared with conventional fluorescent materials, the preparation method of fluorescent material (CSI-SiO2) didn’t need the precursor of heavy metals, rare earth metals and other harm contents, making it capable to be an environmentally friendly candidate. More importantly, CSI-SiO2 exhibited hyper-stable photoluminescence performance in harsh conditions including strong acidic, weak alkaline, moist and high temperature conditions, which can be applied in security marking. Graphic abstract: The mechanism diagram of material CSI-SiO2 for defect-induced photoluminescence. [Figure not available: see fulltext.].