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Tuning the extinction coefficient, refractive index, dielectric constant and optical conductivity of Gaq3 films for the application of OLED displays technology

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Abstract

The optoelectronic parameters of tris (8-hydroxyquinoline) gallium (Gaq3) films were tuned by means of post-deposition thermal annealing under nitrogen gas. Nanostructure evolution was seen to play a vital role in the variation of the optoelectronics parameters of these films. The results showed an increased refractive index from 1.53 to ultra-high refractive index of 5.45, along with a maximized dielectric constant of 13.92 and optical conductivity of 56.31 S/cm when the films were annealed at 235 °C. At higher annealing temperature of 255 °C, a decreased trend was noticed for the aforementioned optoelectronic parameters and the grown amorphous nanorods were completely degraded, which has led to the formation of crystalline portions. The results were interpreted in terms of molecular packing density and structural variations. The investigated Gaq3 films were seen to obey Wemple–DiDomenico single oscillator model to provide information regarding the band gap and its strength. The achieved results are greatly important for the application of OLED displays technology and their performance improvement.

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Acknowledgements

The authors would like to acknowledge Universiti Teknologi Malaysia for the financial support from Research University Grant (RUG) UTM Malaysia (Vot: Q.J130000.21A2.03E00). The financial support from University of Human Development regarding the promote of publication is also acknowledged.

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Authors and Affiliations

  1. Center for Composites, Institute for Vehicle Systems & Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia

    Fahmi F. Muhammad & Mohd Yazid Yahya

  2. Soft Materials & Devices Lab, Department of Physics, Faculty of Science & Health, Koya University, Danielle Mitterrand Boulevard, 45 Koya, Kurdistan Region, Iraq

    Fahmi F. Muhammad

  3. Department of Electronics, Faculty of Physical and Numerical Sciences, University of Peshawar, Peshawar, 25000, Pakistan

    Fakhra Aziz

  4. Development Center for Research and Training (DCRT), University of Human Development, Sulaimani, Kurdistan Regional Government, Iraq

    Mariwan A. Rasheed

  5. Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Khaulah Sulaiman

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  1. Fahmi F. Muhammad
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Correspondence to Mohd Yazid Yahya.

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Muhammad, F.F., Yahya, M.Y., Aziz, F. et al. Tuning the extinction coefficient, refractive index, dielectric constant and optical conductivity of Gaq3 films for the application of OLED displays technology. J Mater Sci: Mater Electron 28, 14777–14786 (2017). https://doi.org/10.1007/s10854-017-7347-y

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