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Intense orange emission from hydrothermally synthesized ZnO flower-like structure: effect of charge carrier—LO phonon interaction on emission characteristics

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Abstract

Easy control of electronic and optical properties of ZnO is pivotal for its various optoelectronic applications. The present manuscript illustrates preparation of flower- and needle-like microstructures of ZnO by simple hydrothermal technique using Zn(NO3)2 and NaOH as precursors. The method is found to be suitable to generate different ZnO microstructures just by changing NaOH concentration. Other parameters such as reaction temperature, time have no significant effect other than change of size of the microstructures. After careful analyses of the microstructures by Raman spectroscopy, it appears that charge carrier—LO phonon interaction which plays important role in optoelectronic properties decreases with increasing NaOH concentration. Photoluminescence spectroscopic data depict that the synthesized microstructures exhibit intense and tunable orange emission at 620 nm, attributed to interstitial oxygen defects. The present protocol is found to be very effective to control defects of ZnO microstructures; particularly, it seems to be very sensitive to control oxygen interstitial. Full width at half maxima (FWHM), an important parameter of any optical emission, is observed to be decreasing with increasing NaOH. A theoretical model, developed on the basis of Huang—Rhys ‘S’ factor, has been developed to correlate the trend of FWHM considering charge carrier—LO phonon interaction and orbital radii of the charge carriers.

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Acknowledgements

One of the authors (JR) wants to thank DST, India, for financial support during execution of this work in her M.Tech thesis, while other author (NH) wants to acknowledge UGC, India, for awarding her JRF.

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Authors and Affiliations

  1. School of Materials Science and Nanotechnology, Jadavpur University, Kolkata, 700032, India

    Joyeta Raha, Nibedita Haldar & Chandan Kumar Ghosh

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  1. Joyeta Raha
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  2. Nibedita Haldar
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  3. Chandan Kumar Ghosh
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Correspondence to Chandan Kumar Ghosh.

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Raha, J., Haldar, N. & Ghosh, C.K. Intense orange emission from hydrothermally synthesized ZnO flower-like structure: effect of charge carrier—LO phonon interaction on emission characteristics. Appl. Phys. A 127, 163 (2021). https://doi.org/10.1007/s00339-021-04281-7

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