Modified spontaneous emission of silicon nanocrystals embedded in artificial opals
2007 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 40, no 19, 5847-5853 p.Article in journal (Refereed) Published
Si nanocrystals (NCs) were embedded in synthetic silica opals by means of Si-ion implantation or opal impregnation with porous-Si suspensions. In both types of sample photoluminescence (PL) is strongly Bragg-reflection attenuated (up to 75%) at the frequency of the opal stop-band in a direction perpendicular to the ( 1 1 1) face of the perfect hcp opal structure. Time-resolved PL shows a rich distribution of decay rates, which contains both shorter and longer decay components compared with the ordinary stretched exponential decay of Si NCs. This effect reflects changes in the spontaneous emission rate of Si NCs due to variations in the local density of states of real opal containing defects.
Place, publisher, year, edition, pages
2007. Vol. 40, no 19, 5847-5853 p.
photonic crystals, quantum dots, photoluminescence, spectroscopy
IdentifiersURN: urn:nbn:se:kth:diva-17086DOI: 10.1088/0022-3727/40/19/008ISI: 000250604000009ScopusID: 2-s2.0-34748907461OAI: oai:DiVA.org:kth-17086DiVA: diva2:335129
QC 201005252010-08-052010-08-05Bibliographically approved