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Title: Bright and multicolor luminescent colloidal Si nanocrystals prepared by pulsed laser irradiation in liquid

We reported the preparation of bright and multicolor luminescent colloidal Si nanocrystal (Si-nc) by pulsed UV laser irradiation to porous Si (PSi) in an organic solvent. The different-luminescence-color (different-sized) colloidal Si-nc was produced by the pulsed laser-induced fragmentation of different-sized porous nanostructures. The colloidal Si-nc samples were found to have higher photoluminescence quantum efficiencies (20%–23%) than the PSi samples (1%–3%). The brighter emission of the colloidal Si-nc was attributed to an enhanced radiative band-to-band transition rate due to the presence of a surface organic layer formed by UV laser-induced hydrosilylation.
Authors:
; ;  [1] ;  [2]
  1. Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515 (Japan)
  2. Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573 (Japan)
Publication Date:
OSTI Identifier:
22489299
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COLOR; FRAGMENTATION; LASER RADIATION; LASERS; LAYERS; LIQUIDS; NANOSTRUCTURES; ORGANIC SOLVENTS; PHOTOLUMINESCENCE; POROUS MATERIALS; PULSES; QUANTUM EFFICIENCY; SURFACES