Hyper-stable defect-induced SiO2 powder materials for fluorescence performance

Abstract A novel defect-induced inorganic photoluminescence powder silica (CSI-SiO 2 ) nanomaterial was successfully synthesized via a facile method, where Cs + was doped into SiO 2 by ion exchange, and oxygen vacancy defects were produced during a vacuum calcination treatment at high temperature. CSI-SiO 2 was characterized by scanning electron microscopy, X-ray diffraction and photoluminescence spectroscopy. The result showed that CSI-SiO 2 contained merely three elements including Cs, Si, and O. Compared with conventional fluorescent materials, the preparation method of fluorescent material (CSI-SiO 2 ) 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-SiO 2 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.