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Ultrafast photoluminescence dynamics of blue-emitting silicon nanostructures
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SYSNO ASEP 0361260 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Ultrafast photoluminescence dynamics of blue-emitting silicon nanostructures Author(s) Žídek, K. (CZ)
Trojánek, F. (CZ)
Malý, P. (CZ)
Pelant, Ivan (FZU-D) RID, ORCID, SAI
Gilliot, P. (FR)
Hönerlange, B. (FR)Source Title Physica Status Solidi C : Current Topics in Solid State Physics - ISSN 1862-6351
Roč. 8, č. 3 (2011), s. 979-984Number of pages 6 s. Language eng - English Country DE - Germany Keywords silicon ; nanocrystals ; time-resolved spectroscopy ; luminescence ; polarization ; two-photon absorption Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects IAA101120804 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) LC510 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10100521 - FZU-D (2005-2011) DOI 10.1002/pssc.201000394 Annotation We report on ultrafast photoluminescence (PL) spectroscopy of blue and red-emitting silicon nanostrucures. We prepared samples of porous Si with different dominating PL bands in time-integrated PL spectrum. These samples show also striking differences in ultrafast PL dynamics. For the red-emitting samples we observe rapid PL onset followed by a two-exponential decay, which is spectrally dependent. For the blue-emitting porous Si the PL builds up several ps and decays mono-exponentially with spectrally independent PL rise and decay times. Our results indicate that a dominant part of the blue and red emission comes from two distinct species with different energy states structures. This is also supported by two-photon absorption induced PL measurements. The two-photon and one-photon absorption induced PL spectra, which are identical for the red-emitting samples, differ substantially for the blue-emitting ones. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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