Special Section: Selected Papers from the INFN-LNF Conference on Nanoscience and Nanotechnology

Spectral characterization of bulk and nanostructured aluminum nitride

[+] Author Affiliations
Baiba Berzina, Laima Trinkler, Darja Jakimovica, Valdis Korsaks

University of Latvia, Institute of Solid State Physics, Kengaraga 8, Riga, LV-1063 Latvia

Janis Grabis, Ints Steins, Eriks Palcevskis

Technical University of Riga, Institute of Inorganic Chemistry, Azenes 14, Riga, Latvia

Stefano Bellucci

INFN-Laboratori Nazionali di Frascati, Via Enrico Fermi 40, Frascati, 00044 Italy

Li-Chyong Chen, Surojit Chattopadhyay, Kuei-Hsien Chen

Taiwan National University, Center for Condensed Material Sciences, Taiwan, Taiwan

J. Nanophoton. 3(1), 031950 (December 3, 2009). doi:10.1117/1.3276803
History: Received July 23, 2009; Revised November 24, 2009; Accepted November 24, 2009; December 3, 2009; Online December 03, 2009
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Abstract

Spectral characteristics including photoluminescence (PL) spectra and its excitation spectra for different AlN materials (AlN ceramics, macro size powder and nanostructured forms such as nanopowder, nanorods and nanotips) were investigated at room temperature. Besides the well known UV-blue (around 400 nm) and red (600 nm) luminescence, the 480 nm band was also observed as an asymmetric long-wavelength shoulder of the UV-blue PL band. This band can be related to the luminescence of some kind of surface defects, probably also including the oxygen-related defects. The mechanisms of recombination luminescence and excitation of the UV-blue luminescence caused by the oxygen-related defects were investigated. It was found that the same PL band is characteristic for different AlN materials mentioned above; however, in the nanostructured materials (nanorods, nanotips and nanopowder) the intensity of UV-blue PL is remarkable lower than in the bulk material (ceramics). In the case of nanostructured AlN materials, excitation of the oxygen-related defect is mainly realized through the energy transfer from the host material (electron/hole or exciton processes) to the defects and this mechanism prevails over the mechanism of direct defect excitation.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Baiba Berzina ; Laima Trinkler ; Darja Jakimovica ; Valdis Korsaks ; Janis Grabis, et al.
"Spectral characterization of bulk and nanostructured aluminum nitride", J. Nanophoton. 3(1), 031950 (December 3, 2009). ; http://dx.doi.org/10.1117/1.3276803


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