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Effect Of Low-Temperature Annealing On Structure And Optical Properties Of Amorphous Tris(8-Hydroxyquinoline) Aluminum Films

Author

Listed:
  • FENG JIANG

    (School of Mathematical and Physical Sciences, Dalian University of Technology at Panjin, Panjin 124221, P. R. China2School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China)

  • ZHIYONG PANG

    (School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China)

  • HUIMIN YUAN

    (School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China)

  • ZHIXIAN WEI

    (School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China)

  • WANFENG XIE

    (School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China)

  • SHENGHAO HAN

    (School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China)

Abstract

Needle-shaped nanostructured tris(8-hydroxyquinoline) aluminum nanowires (Alq3) have been obtained by annealing Alq3 amorphous films at 150∘C which is lower than the glass transition temperature of Alq3 (172∘C). The growth of Alq3 nanowires is attributed to the migration and stacking of Alq3 molecules which acquire thermal energy from the annealing process. X-ray diffraction analysis and scanning electronic microscopy spectra show that the Alq3 nanowires are composed of the well-known α-phase Alq3. The intensity of the photoluminescence spectra firstly increases and then decreases as the annealing time increases, along with a spectral blue shift. The optical transmittance spectra of the annealed Alq3 films show a smaller average absorption in the visible range and a wider optical bandgap compared with that of the amorphous films, as a result of the decrease of π overlapping in the Alq3 molecules.

Suggested Citation

  • Feng Jiang & Zhiyong Pang & Huimin Yuan & Zhixian Wei & Wanfeng Xie & Shenghao Han, 2019. "Effect Of Low-Temperature Annealing On Structure And Optical Properties Of Amorphous Tris(8-Hydroxyquinoline) Aluminum Films," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 26(04), pages 1-5, May.
    • Handle: RePEc:wsi:srlxxx:v:26:y:2019:i:04:n:s0218625x18501834
    DOI: 10.1142/S0218625X18501834
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