Microscopic Origin of the Fast Blue-Green Luminescence from Chemically Synthesized Non-Oxidized Silicon Quantum Dots
| Autor: | C.P. Umesh, Tom Gregorkiewicz, Jan Valenta, K. Dohnalová, Martin Hof, Jos M. J. Paulusse, Jana Humpolíčková, Anna Fucikova, Han Zuilhof |
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| Přispěvatelé: | Faculty of Science and Technology, Biomaterials Science and Technology, Hard Condensed Matter (WZI, IoP, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
light-emission
spectroscopy Photoluminescence Materials science IR-85079 nanoclusters Nanoparticle 02 engineering and technology 010402 general chemistry Porous silicon 01 natural sciences Biomaterials General Materials Science Spontaneous emission VLAG si nanocrystals business.industry Organic Chemistry confinement regime General Chemistry Nanosecond 021001 nanoscience & nanotechnology Organische Chemie 0104 chemical sciences porous silicon Quantum dot METIS-293900 Optoelectronics Light emission nanoparticles photoluminescence 0210 nano-technology business Luminescence electronic states alkyl Biotechnology |
| Zdroj: | Small, 8(20), 3185-3191. Wiley-VCH Verlag Small, 8(20), 3185-3191 Small, 8(20), 3185-3191. Wiley-VCH Small 8 (2012) 20 |
| ISSN: | 1613-6810 |
| Popis: | The microscopic origin of the bright nanosecond blue-green photoluminescence (PL), frequently reported for synthesized organically terminated Si quantum dots (Si-QDs), has not been fully resolved, hampering potential applications of this interesting material. Here a comprehensive study of the PL from alkyl-terminated Si-QDs of 2-3 nm size, prepared by wet chemical synthesis is reported. Results obtained on the ensemble and those from the single nano-object level are compared, and they provide conclusive evidence that efficient and tunable emission arises due to radiative recombination of electron-hole pairs confined in the Si-QDs. This understanding paves the way towards applications of chemical synthesis for the development of Si-QDs with tunable sizes and bandgaps. |
| Databáze: | OpenAIRE |
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