Abstract

Photoluminescence (PL) spectroscopy is a highly sensitive tool to study the behaviour of photo-induced electron-hole pair, charge separation and charge recombination process for TiO2. The process of electron-hole separation, electron-hole scattering and electron-hole recombination can be obtained from the PL spectrum. The PL intensity peak of exciton and trap levels might be associated with Raman scattering mode of vibrational lattice of TiO2. The objective of this work is to study the behaviour of charge recombination of electron beam irradiated TiO2 nanoparticles by using PL spectroscopy in association with Raman scattering analysis. PL results indicated that the electron irradiated anatase TiO2 particles at 100-1000 kGy has showed radiative recombination of self-trapped exiton (STE). This is related to the oxygen vacancy defects as a result of electron trap in the in visible transition region due to δ (O-Ti-O) bending mode of TiO2 lattice.

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