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Influence of oxygen atmosphere on the photoluminescence properties of sol–gel derived ZrO2 thin films

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Abstract

Homogeneous and transparent ZrO2 thin films were prepared by sol–gel dip coating method. The prepared ZrO2 thin films were annealed in air and O2 atmosphere at 500, 700 and 900 °C for 1, 5 and 10 h. X-Ray diffraction (XRD) pattern showed the formation of tetragonal phase with a change of stress in the films. Scanning electron microscope (SEM) revealed the nucleation and particle growth on the films. An average transmittance of >80 % (in UV–Vis region) was observed for all samples. The refractive index and direct energy band gap were found to vary as functions of annealing atmosphere, temperature and time. Photoluminescence (PL) revealed an intense emission peak at 379 nm weak emission peaks at 294, 586 and 754 nm. An enhancement of PL intensity was observed in films annealed in O2 atmosphere. This is due to reconstruction of zirconium nanocrystals interfaces, which help passivate the non-radiative defects. At 900 °C, oxygen atoms react with Zr easily at the interface and destroy the interface states acting as emission centres and quench the PL intensity of the film. The enhancement of the luminescence properties of ZrO2 by the passivation of non radiative defects presents in the films make it suitable for gas sensors development, tuneable lasers and compact disc (CD) read-heads.

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Acknowledgments

The authors are grateful for the financial assistance of KSCSTE, Govt. of Kerala, India, Major Research Project (2009–2012).

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Authors and Affiliations

  1. Thin Film Laboratory, Post Graduate and Research Department of Physics, Mar Ivanios College, Thiruvananthapuram, 695015, India

    I. John Berlin, V. S. Anitha, P. V. Thomas & K. Joy

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  1. I. John Berlin
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  2. V. S. Anitha
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  3. P. V. Thomas
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  4. K. Joy
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Correspondence to K. Joy.

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Berlin, I.J., Anitha, V.S., Thomas, P.V. et al. Influence of oxygen atmosphere on the photoluminescence properties of sol–gel derived ZrO2 thin films. J Sol-Gel Sci Technol 64, 289–296 (2012). https://doi.org/10.1007/s10971-012-2856-x

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