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Solvent Effect on Electrical and Optical Properties of Poly(9,9-di-n-Octylfluorenyl-2,7-diyl)-Based Polymer Light-Emitting Applications
Abstract
Poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) polymer-based light-emitting diodes (PLEDs) were synthesized using toluene and tetrahydrofuran (THF). The PFO-based PLEDs were deposited onto polyaniline (emeraldine base) (PANI)/ITO using the doctor blade technique, followed by structural, morphological, topographical and electrical properties of the polymer films were examined. The chemical bonds, absorbance and photoluminescence (PL) spectra of the samples were also investigated, and the effect of the precursor solvent on these characteristics of PFO-based PLEDs was studied, revealing that the toluene-PFO film (higher viscosity and surface roughness) displayed a higher PL intensity. Polarity affects the emission wavelength by causing a red shift in the PL spectra to the THF-PFO film, which is attributable to its higher polarity index. Vapor pressure was shown to cause switching of the PL intensity for both PFO-based PLEDs. The results also revealed poor color quality in the green emission at 2.2 to 2.4 eV; thus, viscosity, vapor pressure and polarity of the solvents strongly affect the characteristics of PFO thin films. The precursor solvent for the synthesis of PFO can be considered a tuning factor for the emission of PFO-based PLED.
Keywords
polyfluorene,
solvent properties,
electrical properties,
optical properties,
polymer-based light-emitting diode
Supporting agencies: The authors thank the Malaysian Government and University Sains Malaysia (USM) for the research facilities and the Research University (RUI) Grant No: 1001.PFIZIK.8011081 to conduct this work. Our gratitude also goes to the Institute of Nano Optoelectronics Research and Technology (INOR), University Sains Malaysia. FAS would like to thank University Sains Malaysia for the Postdoctoral Fellowship.
About the Authors
F. A. Sabah
Alfarahidi University
Iraq
Iraq
Fayroz A. Sabah - Department of Laser and Optoelectronics Technical Engineering, College of Technical Engineering, Alfarahidi University.
Baghdad
I. A. Razak
University Sains Malaysia
Malaysia
Malaysia
Ibrahim Abdul Razak - School of Physics, University Sains Malaysia.
11800 USM, Penang
E. A. Kabaa
University Sains Malaysia
Malaysia
Malaysia
Institute of Nano Optoelectronics Research and Technology (INOR), University Sains Malaysia.
11800 USM, Penang
N. A.A. Rahim
University Malaysia Perlis (UniMAP)
Malaysia
Malaysia
Nor Azura Abdul Rahim - Faculty of Chemical Engineering Technology, University Malaysia Perlis (UniMAP).
Kompleks Pengajian Jejawi 2, Arau, Perlis
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Review
For citations:
Sabah F.A., Razak I.A., Kabaa E.A., Rahim N.A. Solvent Effect on Electrical and Optical Properties of Poly(9,9-di-n-Octylfluorenyl-2,7-diyl)-Based Polymer Light-Emitting Applications. Zhurnal Prikladnoii Spektroskopii. 2026;93(2):290-1-290-9.
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