A Researcher from KOU Published a Research Paper in the Journal of Materials Research and Technology

imr&t, Koya UniversityDr. Fahmi F. Mohammadsharif at the Department of Physics, Faculty of Science and Health, Koya University Published a new resaerch articlle entitled "A new insight into the temperature induced molecular aggregations in tris(8-hydroxyquinoline) metals." The research article has been published in the Journal of Materials Research and Technology which indexed by Clarivate Analytics with IF=3.327 and SCOPUS with Level Q1. The article authors are: Fahmi F. MuhammadsharifSuhairul Hashim, Khaulah Sulaiman, G. Baldacchini.

The results achived by this reseach article opened a new route of fabricating highly emissive thin films of amorphous nanostructure, which are specifically important for organic light emitting diode (OLED) based displays.

 

About the Journal:

About the research article:

  • Title: A new insight into the temperature induced molecular aggregations in tris(8-hydroxyquinoline) metals
  • Received 25 December 2019
  • Accepted 22 February 2020
  • Available online 6 March 2020
  • doi: https://doi.org/10.1016/j.jmrt.2020.02.084

Abstract:
Annealing of tris(8-hydroxyquinoline) gallium (Gaq3) film at various temperatures in dry N2 atmosphere has shown the existences of four different phases of molecular aggregations before the burning out of the film at about 310 °C. The first three phases, up to 235 °C, are amorphous molecular aggregations, while the fourth one at 255 °C is a crystalline structure, very likely α-polymorph. The photoluminescence (PL) intensity was increased to about five times greater than that of the pristine film at 235 °C, while the PL peak was blue shifted consistently. Although a small contribution of Rayleigh scattering cannot be excluded at high temperatures when crystallites appear, the PL blueshift was mainly attributed to the nanostructured molecular aggregations followed by enhanced PL intensity. These new findings can be a common characteristic of organometallic complexes at varied annealing temperatures. The presented results open a new route of fabricating highly emissive thin films of amorphous nanostructure, which are specifically important for organic light emitting diode (OLED) based displays.

About the authors:
Fahmi F. MuhammadsharifDepartment of Physics, Faculty of Science and Health, Koya University, 44023 Koya, Kurdistan Region-F.R., Iraq.
ORCID: https://orcid.org/0000-0002-4563-9671
Suhairul Hashim: (1) Department of Physics, Faculty of Science, Universiti Teknologi Malaysia (UTM), 81310 Skudai, Johor, Malaysia; (2) Centre for Sustainable Nanomaterials (CSNano), Ibnu Sina Institute for Scientific and Industrial Research (ISI-SIR), Universiti Teknologi Malaysia (UTM), 81310 Skudai, Johor, Malaysia.
ORCID: https://orcid.org/0000-0001-8758-4288
Khaulah SulaimanLow Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
ORCID: https://orcid.org/0000-0003-3473-0493
G. BaldacchiniVia Guglielmo Quattrucci 246, Grottaferrata, 00046 Rome, Italy, formerly ENEA, Frascati Research Center, 00044 Frascati, Rome, Italy

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