Spectral behavior of the emission around 3.31 eV (A-line) from ZnO nanocrystals

• Published in: Journal of luminescence Vol. 130; no. 5; pp. 767 - 770
• Main Authors: Kurbanov, S.S., Kang, T.W.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-05-2010; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Nanocrystals; Nanocrystals and nanoparticles; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Photoluminescence; Physics; ZnO; ZnO; Nanocrystals; Photoluminescence; Optical phonons; Particle size; Crystal defects; Excitons; Temperature effects; Zinc oxide; Excitation spectrum; Nanocrystal
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2009.11.030

The emission at around 3.31
eV (A-line) from three types of ZnO nanocrystals with different particle sizes (10–1000
nm) was studied. The photoluminescence (PL) measurements were performed under different excitation densities and at different temperatures. The A-line emission exhibited a strong dependence on temperature and excitation power density. With increasing excitation density and temperature overlapping of the closely spaced first longitudinal optical (LO) phonon replica of free excitons by the A-line emission was observed.