Photoluminescence from gas-suspended SiO{sub x} nanoparticles synthesized by laser ablation

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.121892· OSTI ID:639048

Geohegan, D B; Puretzky, A A; Duscher, G; Pennycook, S J ^[1]

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1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6056 (United States)

Time-resolved photoluminescence (PL) spectra are reported for gas-suspended 1{endash}10 nm diameter SiO{sub x} particles formed by laser ablation of Si into 1{endash}10 Torr He and Ar. Three spectral bands (1.8, 2.5 and 3.2 eV) similar to PL from oxidized porous silicon were measured, but with a pronounced vibronic structure. Particle size and composition were determined with {ital Z}-contrast transmission electron microscopy imaging and high resolution electron energy loss spectroscopy linescans of individual nanoparticles. Maximized violet (3.2 eV) PL from the gas-suspended nanoparticles was correlated with an {ital ex situ} SiO{sub 1.4} overall particle stoichiometry. Cryogenically-collected gas-suspended nanoparticles produced web-like-aggregate films exhibiting very weak PL. Standard anneals restored strong PL bands without vibronic structure, but otherwise in agreement with the PL measured from the gas-suspended nanoparticles. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 639048
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 73; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABLATION
CHEMICAL COMPOSITION
ENERGY-LOSS SPECTROSCOPY
LASER RADIATION
PARTICLE SIZE
PHOTOLUMINESCENCE
SILICON COMPOUNDS
SILICON OXIDES
TRANSMISSION ELECTRON MICROSCOPY
VIBRATIONAL STATES