G
Guy Allan
Researcher at Centre national de la recherche scientifique
Publications - 84
Citations - 9768
Guy Allan is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Quantum dot & Band gap. The author has an hindex of 39, co-authored 84 publications receiving 9349 citations. Previous affiliations of Guy Allan include Ghent University.
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Journal ArticleDOI
Electronic States and Luminescence in Porous Silicon Quantum Dots: The Role of Oxygen
TL;DR: The photoluminescence (PL) of silicon quantum dots present in porous silicon can be tuned from the near infrared to the ultraviolet when the surface is passivated with Si-H bonds as discussed by the authors.
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Size-dependent optical properties of colloidal PbS quantum dots.
Iwan Moreels,Karel Lambert,Dries Smeets,David De Muynck,Tom Nollet,José C. Martins,Frank Vanhaecke,André Vantomme,Christophe Delerue,Guy Allan,Zeger Hens +10 more
TL;DR: At high energies, the molar extinction coefficient epsilon increases with the Qdot volume d(3) and agrees with theoretical calculations using the Maxwell-Garnett effective medium theory and bulk values for the Q dot dielectric function.
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Theoretical aspects of the luminescence of porous silicon.
TL;DR: The luminescence in the visible range of porous silicon is analyzed in the hypothesis of quantum confinement and it is concluded that experimental nonradiative processes in porous silicon are more efficient than calculated radiative ones at T=300 K.
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Composition and size-dependent extinction coefficient of colloidal PbSe quantum dots
Iwan Moreels,Karel Lambert,David De Muynck,Frank Vanhaecke,Dirk Poelman,José C. Martins,Guy Allan,Zeger Hens +7 more
TL;DR: In this article, inductively coupled plasma mass spectrometry (ICP-MS) was combined with UV-vis−NIR spectrophotometry and transmission electron microscopy to determine the nanocrystal composition and molar extinction coefficient ϵ of colloidal PbSe quantum dot (Q-PbSe) suspensions.
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Electronic structure and optical properties of silicon crystallites: Application to porous silicon
TL;DR: In this article, the electronic structure of spherical silicon crystallites containing up to 2058 Si atoms was calculated and a variation of the optical band gap with respect to the size of the crystallites was predicted in very good agreement with available experimental results.