Effects of natural oxidation on the photoluminescence properties of Si nanocrystals prepared by pulsed laser ablation

Xu, Yanmei; Han, Yongqin

doi:10.1007/s00339-014-8593-y

Cited by 6 publications

(1 citation statement)

References 25 publications

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“…It is reported that the following PL mechanisms are often used to explain the fast blue PL in Si NCs: (i) The first one is attributed to the direct bandgap recombination of electronsholes pairs at Γ point. (ii) The second one is the excitons recombination in Si NCs with certain modified surface [61]. (iii) The third one is related to oxygen-related surface states, PL peak value will keep fixed when excited by different wavelength [33].…”

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confidence: 99%

Correlation between luminescence and structural evolution of colloidal silicon nanocrystals synthesized under different laser fluences

Zhang

et al. 2017

Nanotechnology

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We present a detailed investigation of the structural evolution and photoluminescence (PL) properties of colloidal silicon (Si) nanocrystals (NCs) synthesized through femtosecond laser ablation at different laser fluences. It is shown that the mean size of colloidal Si NCs increases from ∼0.97-2.37 nm when increasing laser fluence from 1.0-2.5 mJ cm. On the basis of structural characterization, temperature-dependent PL, time-resolved PL, and PL excitation spectra, we identify that the size-dependent spectral shift of violet emission is attributed to the quantum confinement effect. The localized excitons' radiative recombination via the oxygen-related surface states on the surface of the colloidal Si NCs is employed to explain the origin of the blue emission.

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confidence: 99%