Dominant luminescence is not due to quantum confinement in molecular-sized silicon carbide nanocrystals
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TLDR
It is shown 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.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.read more
Citations
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Ultra-small photoluminescent silicon-carbide nanocrystals by atmospheric-pressure plasmas
Sadegh Askari,Sadegh Askari,Atta Ul Haq,Manuel Macias-Montero,Igor Levchenko,Fengjiao Yu,Wuzong Zhou,Kostya Ostrikov,Kostya Ostrikov,Paul Maguire,Vladimir Svrcek,Davide Mariotti +11 more
TL;DR: Highly size-controllable synthesis of free-standing perfectly crystalline silicon carbide nanocrystals has been achieved for the first time through a plasma-based bottom-up process, leading to fundamental insights into optical properties of the nanocry crystals.
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White Light Emission from Fluorescent SiC with Porous Surface.
Weifang Lu,Yiyu Ou,Elisabetta Maria Fiordaliso,Yoshimi Iwasa,Valdas Jokubavicius,Mikael Syväjärvi,Satoshi Kamiyama,Paul Michael Petersen,Haiyan Ou +8 more
TL;DR: Porous fluorescent SiC can offer a great flexibility in color rendering by changing the thickness of porous layer and bulk fluorescent layer, and such a novel approach opens a new perspective for the development of high performance and rare-earth element free white light emitting materials.
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Identification of Luminescence Centers in Molecular-Sized Silicon Carbide Nanocrystals
David Beke,David Beke,Tibor Z. Jánosi,Bálint Somogyi,Dániel Á. Major,Zsolt Szekrényes,János Erostyák,Katalin Kamarás,Adam Gali,Adam Gali +9 more
TL;DR: In this article, a combination of advanced time-resolved spectroscopy and ab initio simulations, aided by surface engineering, is able to identify the luminescence centers of such complex systems.
Journal ArticleDOI
Fluorescent color centers in laser ablated 4H-SiC nanoparticles
Stefania Castelletto,A. F. M. Almutairi,G. Thalassinos,Alexander Lohrmann,Ričardas Buividas,Desmond W. M. Lau,Philipp Reineck,Saulius Juodkazis,Takeshi Ohshima,Brant C. Gibson,Brett C. Johnson +10 more
TL;DR: This work fabricated from electron irradiated bulk 4H-SiC, 40-50 nm diameter SiC nanoparticles, fluorescent at 850-950 nm, demonstrating photoluminescence is attributed to the silicon vacancy color centers.
Journal ArticleDOI
Electrochemical Synthesis of Carbon Fluorooxide Nanoparticles from 3C-SiC Substrates
TL;DR: In this paper, the chemical nature of products formed during electrochemical dissolution of polycrystalline 3C-SiC substrate in HF:ethanol mixture, was studied by means of FTIR spectroscopy, temperature-programmed desorption mass spectrometry (TPD-MS), 1H, 13C, and 19F NMR (solution as well as MAS), XPS, AFM, and other characterization methods.
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