Dominant luminescence is not due to quantum confinement in molecular-sized silicon carbide nanocrystals

David Beke, Zsolt Szekrényes, Zsolt Czigány, Katalin Kamarás, Ádám Gali

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Molecular-sized colloid silicon carbide (SiC) nanoparticles are very promising candidates to realize bioinert non-perturbative fluorescent nanoparticles for in vivo bioimaging. Furthermore, SiC nanoparticles with engineered vacancy-related emission centres may realize magneto-optical probes operating at nanoscale resolution. Understanding the nature of molecular-sized SiC nanoparticle emission is essential for further applications. Here we report an efficient and simple method to produce a relatively narrow size distribution of water soluble molecular-sized SiC nanoparticles. The tight control of their size distribution makes it possible to demonstrate a switching mechanism in the luminescence correlated with particle size. We show that molecular-sized SiC nanoparticles of 1-3 nm show a relatively strong and broad surface related luminescence whilst the larger ones exhibit a relatively weak band edge and structural defect luminescence with no evidence of quantum confinement effect.

Original languageEnglish
Pages (from-to)10982-10988
Number of pages7
JournalNanoscale
Volume7
Issue number25
DOIs
Publication statusPublished - Jul 7 2015

ASJC Scopus subject areas

  • Materials Science(all)

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