We report the study of the visible-ultraviolet emission properties and the structural features of silicananoparticles prepared through a laboratory sol–gel technique. Atomic force microscopy, Raman andInfrared investigations highlighted the 10 nm size, purity and porosity of the obtained nanoparticles. Byusing time resolved photoluminescence techniques in air and in a vacuum we were able to single outtwo contributions in the visible emission: the first, stable in both atmospheres, is a typical fast blue bandcentered around 2.8 eV; the second, only observed in a vacuum around the 3.0–3.5 eV range, is a vibrationalprogression with two phonon modes at 1370 cm-1 and 360 cm-1. By fully characterizing thespectroscopic features of this structured emission, we determine its vibronic properties and clarify thedifferent origins with respect to the blue luminescent defect.
|Number of pages||7|
|Journal||Physical Chemistry Chemical Physics|
|Publication status||Published - 2014|
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy
- Physical and Theoretical Chemistry