Počet záznamů: 1  

Ultrafast photoluminescence dynamics of blue-emitting silicon nanostructures

  1. 1. 0361260 - FZU-D 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: Current Topics in Solid State Physics. Roč. 8, č. 3 (2011), s. 979-984 ISSN 1862-6351
    Grant CEP: GA AV ČR(CZ) IAA101120804; GA MŠk 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

    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