Luminescence anisotropy of ZnO microrods

• Published in: Journal of luminescence Vol. 132; no. 10; pp. 2643 - 2647
• Main Authors: Khranovskyy, V., Lazorenko, V., Lashkarev, G., Yakimova, R.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2012; Elsevier
• Subjects: Cathodoluminescence; Cathodoluminescence, ionoluminescence; Condensed matter: electronic structure, electrical, magnetic, and optical properties; DLE emission; Electron states; Emission; Exact sciences and technology; Excitons and related phenomena; Ii-vi semiconductors; Light emission; Luminescence; Morphology; NBE emission; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other luminescence and radiative recombination; Photoluminescence; Physics; Spectral emissivity; Surface defects; TECHNOLOGY; TEKNIKVETENSKAP; Ultraviolet emission; Zinc oxide; ZnO microrods; DLE emission; ZnO microrods; NBE emission; Cathodoluminescence; Photoluminescence; Luminescence; Binary compounds; Zinc Oxides; Faceting; II-VI semiconductors; Anisotropy; Surface defect; Emission spectra; Ambient temperature; Zinc oxide; Donor center; Bound exciton; Microstructure; Crystal morphology
• ISSN: 0022-2313; 1872-7883; 1872-7883
• DOI: 10.1016/j.jlumin.2012.04.048

The local features of light emission from ZnO microrods were studied: it is revealed that ZnO luminescence spectra are significantly influenced by the crystal morphology. It is shown that the near and edge ultraviolet emission occurs primarily from the top (0001) planes of ZnO microrods; while the defect related visible emission was found to occur dominantly from the side facets. The room temperature cathodoluminescence analysis revealed that visible emission consists of a few overlapping peaks, arising due to recombination on common points and surface defects (Zni, Vo, Vo0/Vo⁎*, Vo** and surface defects.). While at low temperature, only the luminescence due to neutral donor bound exciton (D0X) emission is observed. The data obtained suggest that the light emission spectra of ZnO material of diverse morphology cannot be directly compared, although some common spectral features are present. ► ZnO luminescence spectra are significantly influenced by the crystal morphology. ► The ultraviolet NBE emission occurs primarily from the top (0001) planes of ZnO. ► The visible deep-level emission occurs dominantly from the side facets. ► RT PL spectra consists of a few overlapping peaks due point and surface defects. ► The ZnO luminescence anisotropy may be crucial for the design of optoelectronic devices.