Synthesis of blue-shifted luminescent colloidal GaN nanocrystals through femtosecond pulsed laser ablation in organic solution

Date
2016-05
Authors
Demirel, A.
Öztaş T.
Kurşungöz, C.
Yılmaz, İ.
Ortaç, B.
Advisor
Instructor
Source Title
Journal of Nanoparticle Research
Print ISSN
1388-0764
Electronic ISSN
Publisher
Springer Netherlands
Volume
18
Issue
128
Pages
1 - 10
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

We demonstrate the synthesis of GaN nanocrystals (NCs) with the sizes of less than the doubled exciton Bohr radius leading quantum confinement effects via a single-step technique. The generation of colloidal GaN nanoparticles (NPs) in organic solution through nanosecond (ns) and femtosecond (fs) pulsed laser ablation (PLA) of GaN powder was carried out. Ns PLA in ethanol and polymer matrix resulted in amorphous GaN-NPs with the size distribution of 12.4 ± 7.0 and 6.4 ± 2.3 nm, respectively, whereas fs PLA in ethanol produced colloidal GaN-NCs with spherical shape within 4.2 ± 1.9 nm particle size distribution. XRD and selected area electron diffraction analysis of the product via fs PLA revealed that GaN-NCs are in wurtzite structure. Moreover, X-ray photoelectron spectroscopy measurements also confirm the presence of GaN nanomaterials. The colloidal GaN-NCs solution exhibits strong blue shift in the absorption spectrum compared to that of the GaN-NPs via ns PLA in ethanol. Furthermore, the photoluminescence emission behavior of fs PLA-generated GaN-NCs in the 295–400 nm wavelength range is observed with a peak position located at 305 nm showing a strong blue shift with respect to the bulk GaN.

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Book Title
Keywords
Femtosecond/nanosecond pulsed laser ablation in organic solution, Gallium nitride nanoparticles, Photoluminescence, Ultrasmall nanocrystal generation, Ablation, Absorption spectroscopy, Electron diffraction, Ethanol, Gallium nitride, Laser ablation, Nanocrystals, Nanoparticles, Organic lasers, Particle size, Particle size analysis, Photoluminescence, Size distribution, Ultrafast lasers, X ray photoelectron spectroscopy, Zinc sulfide, Exciton Bohr radius, Femtosecond pulsed laser ablation, Gallium nitride nanoparticles, Organic solutions, Photoluminescence emission, Quantum confinement effects, Selected area electron diffraction analysis, Ultra-small, Pulsed lasers, Gallium nitride nanocrystal, Nanocrystal, Nanomaterial, Nanoparticle, Polymer, Quantum dot, Unclassified drug, Analytic method, Article, Chemical modification, Colloid, Crystal structure, Electron diffraction, Particle size, Photoluminescence, Priority journal, Pulsed laser ablation, X ray diffraction, X ray photoelectron spectroscopy
Citation
Published Version (Please cite this version)