| DOI | Trouver le DOI : https://doi.org/10.1021/nn4000644 |
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| Auteur | Rechercher : Dasog, Mita; Rechercher : Yang, Zhenyu; Rechercher : Regli, Sarah; Rechercher : Atkins, Tonya M.; Rechercher : Faramus, Angelique; Rechercher : Singh, Mani P.; Rechercher : Muthuswamy, Elayaraja; Rechercher : Kauzlarich, Susan M.; Rechercher : Tilley, Richard D.; Rechercher : Veinot, Jonathan G. C.1 |
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| Affiliation | - Conseil national de recherches du Canada. Technologies de sécurité et de rupture
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| Format | Texte, Article |
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| Sujet | silicon nanocrystals; photoluminescence; surface functionalization; nitrogen |
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| Résumé | Silicon nanocrystals (Si NCs) are attractive functional materials. They are compatible with standard electronics and communications platforms and are biocompatible. Numerous methods have been developed to realize size-controlled Si NC synthesis. While these procedures produce Si NCs that appear identical, their optical responses can differ dramatically. Si NCs prepared using high-temperature methods routinely exhibit photoluminescence agreeing with the effective mass approximation (EMA), while those prepared via solution methods exhibit blue emission that is somewhat independent of particle size. Despite many proposals, a definitive explanation for this difference has been elusive for no less than a decade. This apparent dichotomy brings into question our understanding of Si NC properties and potentially limits the scope of their application. The present contribution takes a substantial step forward toward identifying the origin of the blue emission that is not expected based upon EMA predictions. It describes a detailed comparison of Si NCs obtained from three of the most widely cited procedures as well as the conversion of red-emitting Si NCs to blue emitters upon exposure to nitrogen-containing reagents. Analysis of the evidence is consistent with the hypothesis that the presence of trace nitrogen and oxygen even at the parts per million level in Si NCs gives rise to the blue emission. |
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| Date de publication | 2013-02-08 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 21270522 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 99345083-e7c6-4cb7-b50c-c878f5515c4c |
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| Enregistrement créé | 2014-02-14 |
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| Enregistrement modifié | 2020-04-22 |
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