Spectroscopic and physical properties of nano-structure silica gel co-doped with some elements challenge for photonic applications

Abstract

The purpose of the present work is to study some of the spectroscopic and physical properties of Silica–titania (SiO2–TiO2) nano-composite doped with some rare earth elements (Ho3+ and Yb3+) ions in the monolith and thin film form. The samples have been prepared using sol-gel technique to reach the best composition with superior optical properties and up-conversion emission spectra in order to be suitable for laser applications, solar cell, wave guide and photocatalyst.

This thesis is divided in to four chapters in addition to list of tables, list of figures and references.

Chapter one: Is devoted to the introduction, which discuss the important of SiO2 –TiO2 nano-composite pure and doped with some rare earth elements. The compounds are receiving great interest in scientific research due to their physical and spectral properties. It also includes overview of the literature survey of pure and co-doped SiO2–TiO2 nano-composite with Ho3+ and Yb3+ ions; from their structure, spectroscopic and physical properties.

Chapter two: Includes the theoretical concepts of physical and spectroscopic properties for SiO2–TiO2 nano-composite crystalline compounds.