Charge transfer state emission dynamics in blue-emitting functionalized silicon nanocrystals

Abstract

Time-resolved photoluminescence spectroscopy reveals a charge transfer state dynamics responsible for the size-independent blue emission observed from dodecylamine and ammonia functionalized silicon nanocrystals.

Exciton-Photon Interactions in Semiconductor Nanocrystals: Radiative Transitions, Non-Radiative Processes and Environment Effects

“…This method is especially efficient for small crystallites, where the role of surface rises. It has been demonstrated experimentally [104,126,127] that chemical synthesis allows to fabricate Si nanocrystals with various ligand coatings, which emit light in visible range with typical nanosecond radiative lifetimes [104,128,129]. Calculations based on the tight-binding model [105] performed for CH 3 -capped Si nanocrystals confirmed the conclusion on the increase of the radiative recombination rate due to the formation of direct-like electronic structure of the crystallite.…”

Spectral Dependencies of the Stretched Exponential Dispersion Factor and Photoluminescence Quantum Yield as a Common Feature of Nanocrystalline Si

“…After almost 30 years of study of Si NCs, the fundamental knowledge on the origin of PL processes is still very limited. There are ongoing debates on whether fast PL band (F‐band) is related to the quasidirect transitions or to defect states . Nevertheless, even for the well‐studied slow PL band (S‐band), there are still a lot of opened questions.…”

“…There are ongoing debates on whether fast PL band (F-band) is related to the quasidirect transitions or to defect states. [43][44][45] Nevertheless, even for the well-studied slow PL band (S-band), there are still a lot of opened questions. A number of quantitative parameters such as, e.g., PL peak position, mean lifetime, and distribution of lifetimes/rates (see the discussion mentioned previously), PL QY, and so on were proven to be tunable by NC size due to the QC effect.…”

Exciton-photon interactions in semiconductor nanocrystals: {radiative transitions, non-radiative processes,} and environment effects

“…This method is especially efficient for small crystallites, where the role of surface rises. It has been demonstrated experimentally 105,127,128 that chemical synthesis allows to fabricate Si nanocrystals with various ligand coatings, which emit light in visible range with typical nanosecond radiative lifetimes 105,129,130 . Calculations based on the tight-binding model 106 performed for CH 3 -capped Si nanocrystals confirmed the conclusion on the increase of the radiative recombination rate due to the formation of direct-like electronic structure of the crystallite.…”