Femtosecond laser-induced size reduction and emission quantum yield enhancement of colloidal silicon nanocrystals: effect of laser ablation time

Colloidal silicon (Si) nanocrystals (NCs) with different sizes were successfully prepared by femtosecond laser ablation under different laser ablation time (LAT). The mean size decreases from 4.23 to 1.42 nm by increasing the LAT from 30 to 120 min. In combination with structural characterization, t...

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Veröffentlicht in:	Nanotechnology 2018-09, Vol.29 (36), p.365706-365706
Hauptverfasser:	Zhang, Y X, Wu, W S, Hao, H L, Shen, W Z
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Sprache:	eng
Schlagworte:	colloidal silicon nanocrystals laser ablation time optical properties photoluminescence quantum yield
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creator	Zhang, Y X Wu, W S Hao, H L Shen, W Z
description	Colloidal silicon (Si) nanocrystals (NCs) with different sizes were successfully prepared by femtosecond laser ablation under different laser ablation time (LAT). The mean size decreases from 4.23 to 1.42 nm by increasing the LAT from 30 to 120 min. In combination with structural characterization, temperature-dependent photoluminescence (PL), time-resolved PL and PL excitation spectra, we attribute room-temperature blue emissions peaked at 405 and 430 nm to the radiative recombination of electron-hole pairs via the oxygen-deficient centers related to Si-C-H2 and Si-O-Si bonds of colloidal Si NCs prepared in 1-octene, respectively. In particular, the measured PL quantum yield of colloidal Si NCs has been enhanced significantly from 23.6% to 55.8% by prolonging the LAT from 30 to 120 min.
doi_str_mv	10.1088/1361-6528/aacd75
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The mean size decreases from 4.23 to 1.42 nm by increasing the LAT from 30 to 120 min. In combination with structural characterization, temperature-dependent photoluminescence (PL), time-resolved PL and PL excitation spectra, we attribute room-temperature blue emissions peaked at 405 and 430 nm to the radiative recombination of electron-hole pairs via the oxygen-deficient centers related to Si-C-H2 and Si-O-Si bonds of colloidal Si NCs prepared in 1-octene, respectively. In particular, the measured PL quantum yield of colloidal Si NCs has been enhanced significantly from 23.6% to 55.8% by prolonging the LAT from 30 to 120 min.</abstract><cop>England</cop><pub>IOP Publishing</pub><pmid>29916813</pmid><doi>10.1088/1361-6528/aacd75</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0001-5446-5071</orcidid></addata></record>
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subjects	colloidal silicon nanocrystals laser ablation time optical properties photoluminescence quantum yield
title	Femtosecond laser-induced size reduction and emission quantum yield enhancement of colloidal silicon nanocrystals: effect of laser ablation time
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