Skip to main content
Article thumbnail
Location of Repository

Mechanism of quantum dot luminescence excitation within implanted $SiO_{2}$:Si:C films

By A. F. Zatsepin, E. A. Buntov, V. S. Kortov, D. I. Tetelbaum, A. N. Mikhaylov and A. I. Belov

Abstract

Results of the investigation of photoluminescence (PL) mechanisms for silicon dioxide films implanted with ions of silicon (100 keV; 7 × 10(16) cm(-2)) and carbon (50 keV; 7 × 10(15)-1.5 × 10(17) cm(-2)) are presented. The spectral, kinetic and thermal activation properties of the quantum dots (Si, C and SiC) formed by a subsequent annealing were studied by means of time-resolved luminescence spectroscopy under selective synchrotron radiation excitation. Independent quantum dot PL excitation channels involving energy transfer from the SiO(2) matrix point defects and excitons were discovered. A resonant mechanism of the energy transfer from the matrix point defects (E' and ODC) is shown to provide the fastest PL decay of nanosecond order. The critical distances (6-9 nm) of energy transport between the bulk defects and nanoclusters were determined in terms of the Inokuti-Hirayama model. An exchange interaction mechanism is realized between the surface defects (E(s)'-centres) and the luminescent nanoparticles. The peculiarities of an anomalous PL temperature dependence are explained in terms of a nonradiative energy transfer from the matrix excitons. It is established that resonant transfer to the luminescence centre triplet state is realized in the case of self-trapped excitons. In contrast, the PL excitation via free excitons includes the stages of energy transfer to the singlet state, thermally activated singlet-triplet conversion and radiative recombination

Topics: info:eu-repo/classification/ddc/530
Publisher: IOP Publ.
Year: 2012
DOI identifier: 10.1088/0953-8984
OAI identifier: oai:bib-pubdb1.desy.de:97508
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://bib-pubdb1.desy.de/sear... (external link)
  • http://bib-pubdb1.desy.de/reco... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.