Size Effect on the Photoluminescence Shift in Wide Band-Gap Material: A Case Study of SiO2-Nanoparticles

Yit-Tsong Chen

doi:10.6180/jase.2002.5.2.05

Size Effect on the Photoluminescence Shift in Wide Band-Gap Material: A Case Study of SiO2-Nanoparticles

Yit-Tsong Chen^1,2

¹Department of Chemistry National Taiwan University Taipei, Taiwan 106, R.O.C.
²Institute of Atomic and Molecular Sciences Academia Sinica, P.O. Box 23-166 Taipei, Taiwan 106, R.O.C.

Received: April 15, 2002
Accepted: May 17, 2002
Publication Date: June 1, 2002

Download Citation: ||https://doi.org/10.6180/jase.2002.5.2.05

ABSTRACT

In this article, I will discuss the optical properties of SiO₂-nanoparticles that we have investigated recently by photoluminescence (PL) spectroscopy. In particular, I will show the blue-shifts of PL, originating from the electron-hole recombination of the self-trapped exciton (STE), observed in smaller-sized SiO₂-nanoparticles. To explain the size effect in relating to the STE PL shift, a question has been raised on whether it is appropriate to apply the quantum confinement (QC) theory usually used for the Mott-Wannier type excitons in semiconductors to wide band-gap material, such as silica. In this study, a laser-heating model of free excitons (FEs) to activate lattice phonons has been developed, rather than the QC effect, to interpret the blue-shifts of STE PL in smaller-sized SiO₂-nanoparticles. The blue-shift of STE PL is actually resulted from phonon-assisted PL due to the thermalization of the SiO2-nanoparticle system during laser irradiation.

Keywords: Size Effect, Photoluminescence, SiO2 Nanoparticles

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