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Luminescence tuning of Si/SiO2 nanoparticles in aqueous solutions

A. MARCU1,* , C. SIMA1, C. GRIGORIU1, I. ENCULESCU2, B. ILIESCU2

Affiliation

  1. National Institute for Laser, Plasma and Radiation Physics, Atomistilor 409, P.O.Box MG 36, Bucharest-Magurele, Romania
  2. National Institute] of Materials Physics, Atomistilor 105 bis, P.O.Box MG MG7, Bucharest-Magurele, Romania

Abstract

We investigated the possibility of tuning luminescent spectra for a given Si/SiO2 nanoparticle size distribution in aqueous solution. The luminescence spectra of Si/SiO2 suspensions in aqueous solutions of different particle/cluster concentrations were studied. The different Si/SiO2 nanoparticle/cluster concentrations were produced by both centrifugation and dilution. Depending on the centrifugal force we found a reversible shift up to 100 nm toward UV, regardless of the excitation wavelength. The shift could be reverse by sonication of the sample. A scenario based on particle and cluster size variation is also discussed..

Keywords

Luminescence, Nanoparticles, Si/SiO2 Quantum dots, UV effect.

Submitted at: Oct. 1, 2008
Accepted at: Nov. 11, 2008

Citation

A. MARCU, C. SIMA, C. GRIGORIU, I. ENCULESCU, B. ILIESCU, Luminescence tuning of Si/SiO2 nanoparticles in aqueous solutions, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 11, pp. 3131-3134 (2008)