Change search
ReferencesLink to record
Permanent link

Direct link
Light-Emission Performance of Silicon Nanocrystals Deduced from Single Quantum Dot Spectroscopy
Show others and affiliations
2008 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 18, no 18, 2666-2672 p.Article in journal (Refereed) Published
Abstract [en]

Spectra of individual silicon nanocrystals within porous Si grains are studied by the wide-field imaging microspectroscopy and their ON-OFF, blinking is detected by the confocal single-photon-counting microscopy. Observed spectral and blinking properties comprise all features reported before in differently prepared single Si nanocrystals (SiNCs). Former apparently contradictory results are shown to be due to different experimental conditions. When the effect of dark periods (OFF switching) is removed the common ultimate photoluminescence properties Of SiO2 passivated SiNCs are found, namely the quantum efficiency (QE) of about 10-20% up to the pumping rate corresponding to one exciton average excitation per quantum dot. At higher pump rates the QE is slowly decreasing as the 0.7th power of excitation. This is most likely due to Auger recombination which, however, seems to be weakened compared with measurements of nanocrystal assemblies. We conclude that SiNCs may be pumped above one exciton occupancy to yield a higher light emission, being advantageous for applications.

Place, publisher, year, edition, pages
2008. Vol. 18, no 18, 2666-2672 p.
Keyword [en]
si nanocrystals, photoluminescence, nanoparticles, efficiency, luminescence, temperature
URN: urn:nbn:se:kth:diva-17878DOI: 10.1002/adfm.200800397ISI: 000259933000003ScopusID: 2-s2.0-53849116132OAI: diva2:335923
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Linnros, Jan
By organisation
Microelectronics and Applied Physics, MAP
In the same journal
Advanced Functional Materials

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 40 hits
ReferencesLink to record
Permanent link

Direct link