Thermal annealing induced structural and optical properties of Ca doped ZnO nanoparticles

In this letter, the effects of annealing on structural and optical properties of Ca doped ZnO nanoparticles have been investigated. X-ray diffraction analysis reveals that the prepared particles are in hexagonal wurtzite structure and formation of secondary phase related to the Calcite was found aft...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2013-09, Vol.24 (9), p.3183-3188
Main Authors: Udayabhaskar, R., Mangalaraja, R. V., Karthikeyan, B.
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Band spectra
Bands
Calcite
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cold working, work hardening
annealing, quenching, tempering, recovery, and recrystallization
textures
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Electronics
Emission
Exact sciences and technology
Materials
Materials Science
Nanoparticles
Nanopowders
Nanoscale materials and structures: fabrication and characterization
Optical and Electronic Materials
Optical properties
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Photoluminescence
Physics
Treatment of materials and its effects on microstructure and properties
Zinc oxide
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Summary:In this letter, the effects of annealing on structural and optical properties of Ca doped ZnO nanoparticles have been investigated. X-ray diffraction analysis reveals that the prepared particles are in hexagonal wurtzite structure and formation of secondary phase related to the Calcite was found after thermal annealing. UV–Vis measurements show free exciton absorption band appeared at 372 nm and increase of band gap with annealing of samples. Room temperature photoluminescence (PL) spectrum of the prepared Ca doped ZnO nanoparticles shows bands which belong to the near band edge emission at 377 nm and green emission at 556 nm. Annealed samples exhibit enhancement in the blue emission band. Raman spectra show the increment in the electron–phonon coupling value with annealing.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-013-1225-z