Ultrafast photoluminescence dynamics of blue-emitting silicon nanostructures

0361260 - FZÚ 2012 RIV DE eng J - Článek v odborném periodiku
Žídek, K. - Trojánek, F. - Malý, P. - Pelant, Ivan - Gilliot, P. - Hönerlange, B.
Ultrafast photoluminescence dynamics of blue-emitting silicon nanostructures.
Physica Status Solidi C. Roč. 8, č. 3 (2011), s. 979-984. ISSN 1862-6351
Grant CEP: GA AV ČR(CZ) IAA101120804; GA MŠMT LC510
Výzkumný záměr: CEZ:AV0Z10100521
Klíčová slova: silicon * nanocrystals * time-resolved spectroscopy * luminescence * polarization * two-photon absorption
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
http://onlinelibrary.wiley.com/doi/10.1002/pssc.201000394/abstract

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.
Trvalý link: http://hdl.handle.net/11104/0198616