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Effectiveness of Annealing on the Structural, Electrical, and Optical Properties of Erbium(III)-tris(8-hydroxyquinolinato) Films for Possible Use in OLEDs

Abstract

In this study, Erbium tris-8-hydroxyquinoline (Erq3) thin films were deposited on a cleaned glass substrate using the thermal evaporation technique and then thermally annealed up to 523 K. The morphology, optical and electrical properties were investigated for as-deposited and annealed thin films. The grain sizes observed by AFM of the Erq3 thin films vary between 80 and 130 nm. The average surface roughness of the Erq3 thin films was seen to range between 46 and 65 nm. The increase in the annealing temperatures leads to an increase in the average crystallite size by about 60%. The evolution of the electrical and optical properties of our prepared thin films due to the annealing process was correlated with their structural properties. According to Tauc’s theory, a slight increase in the energy gap by about 0.17 eV due to the annealing process was recorded. The nonlinear parameters of Erq3 such as χ3 and n2 decreased by about 41% and 45% due to the increase of the annealing temperature up to 523 K. The increase of the annealing temperature up to 523 K leads to the decrease of the nonlinear coefficients of Erq3 due to the decrease of the localized defect states.

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Data Availability

The datasets supporting the conclusions of this work are included in the article.

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Acknowledgements

The authors extend their appreciation to the Deanship of Scientific Research at the University of Tabuk for funding this work through Research Group RGP-S-1441-69.

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Correspondence to Taymour A. Hamdalla.

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Alsharari, A.M., Qashou, S.I., Alobaidi, R.A.S. et al. Effectiveness of Annealing on the Structural, Electrical, and Optical Properties of Erbium(III)-tris(8-hydroxyquinolinato) Films for Possible Use in OLEDs. J Inorg Organomet Polym (2022). https://doi.org/10.1007/s10904-022-02352-7

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  • DOI: https://doi.org/10.1007/s10904-022-02352-7

Keywords

  • Organic films
  • Electrical conductivity
  • Optical parameters
  • Annealed temperatures