Abstract
Bulk samples of Tris (8-hydroxyquinoline) aluminium (Alq3) were prepared using wet synthesis method followed by annealing at 50 °C, 100 °C, 150 °C and 200 °C for 2 h. X ray diffraction pattern showed the formation of Alq3 crystal which is constituted of Al atom, anions of 8-hydroxyquinoline (8-Hq) and porous Al2O3–Al(OH)3. structure. The spectra of FTIR (Fourier-transform infrared) reveals that annealing Alq3 at 50 °C reduces the C=C peak to negligible but reappears when annealed at 150 °C. FESEM on as-prepared Alq3 shows hexagonal rod shaped stacked structures which on annealing at 50 °C changes to tetragonal agglomerated grains along with appearance of oval and circular shaped pores on it. From fluorescence spectroscopy it is found that the peak intensity changes non-monotonically with annealing temperatures followed by red shift and blue shift of peak maximum at 150 °C and 200 °C respectively. The temperature dependent change in the properties are mainly attributed to the onset of hydrolysis in Alq3 and change in the electronic transition levels.
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Acknowledgements
We express our heartfelt gratitude to Central Instrumental Facility (CIF) at Lovely Professional University (LPU), Phagwara, Punjab, India for carrying out the research work. We would like to thank specially to UGC–DAE CSR Consortium, Kolkata Centre, Sector III, LB-8, Bidhannagar, Kolkata-700106 for providing us free optical characterization facilities for our experimental data. We also express our special thanks to Mr. Nitin Kumar Yadav and Mr. Manoj Kumar for their untiring assistance with resource and logistics support and guidance in the lab.
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All authors have contributed significantly to the study. Material preparation, data collection, analysis, and writing of the final draft were performed by MD, ARM, RM. TP, GP assisted in experimental work and data collection, while working at the UGC-DAE consortium, Kolkata. Proofreading and design of the paper were implemented by MP. RM, the corresponding author, has supervised and finalized the study in this paper. The first draft of the manuscript was written by MD and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Debsharma, M., Pramanik, T., Pramanik, G. et al. Effect of growth temperatures on the structural and optical properties of bulk tris-(8-hydroxyquinoline) aluminium (III). Appl. Phys. A 130, 281 (2024). https://doi.org/10.1007/s00339-024-07461-3
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DOI: https://doi.org/10.1007/s00339-024-07461-3