Journal
NANOTECHNOLOGY
Volume 29, Issue 36, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aacd75
Keywords
laser ablation time; colloidal silicon nanocrystals; optical properties; photoluminescence quantum yield
Funding
- National Natural Science Foundation of China [11504229, 61234005]
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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-H-2 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.
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