Abstract
anhydride-poly(ethylene glycol) co-polymer (A-PEGCP) has been synthesized from maleic anhydride, poly(ethylene glycol) and bisphenol-A diglycidyl ether without using any organic solvent. The thin films produced from A-PEGCP solution were spin-coated on ITO-coated glass. The nanoparticles are observed in the thin films. It is proposed that the nanoparticle is built by a self-assembly process with bisphenol-A aggregates and poly (ethylene glycol) moieties. The effects of concentration, thermal annealing, excitation wavelength and moisture on the optical and nanostructured characterization of the thin films are investigated in this study. Photoluminescence (PL) spectrum of the thin film on ITO-coated glass has a peak of about 450 nm that extends from 360 to 550 nm under 325 nm excitation. The increase in PL intensity is accompanied by a red shift of PL spectrum as concentration increases. Moreover, the slightly red shift of PL spectrum is also observed as annealing temperature increases. Meanwhile, PL intensity negligibly decreases with annealing temperature. The degradation in PL intensity is apparent due to moisture. The excitation-wavelength dependent photoluminescence (EWDP) is observed in the thin film. UV-Vis absorption spectra of the thin films are red-shifted with concentration due to more molecular aggregation. The highest occupied molecular orbital (HOMO) energy is −9.52 eV. The optical band-gap energy is 4.09–4.44 eV.
Highlights
In the past decade intensive attention has been paid to organic materials for their potential applications in flexible displays and solid-state lighting [1,2,3,4,5,6,7,8]
The results show the important role of concentration in the size of the nanoparticle in the thin films
anhydride-poly(ethylene glycol) co-polymer (A-PEGCP) is used as a host material due to its excellent film-forming and wide band-gap properties in optoelectronic applications
Summary
In the past decade intensive attention has been paid to organic materials for their potential applications in flexible displays and solid-state lighting [1,2,3,4,5,6,7,8]. Crystals 2020, 10, 390 conjugated polymers are organic macromolecules that are characterized by a backbone chain of alternating double- and single-bonds. Their overlapping p-orbitals produce a system of delocalized π-electrons, which give rise to their semiconductor properties. The non-conjugated polymer does not have a backbone chain of alternating double- and single-bonds The light emission of conjugated polymers often suffers from aggregation-caused quenching (ACQ) effect [35] due to the formation of non-radiative species, which significantly limits the field of their applications, especially in optoelectronics. A-PEGCP is used as a host material due to its excellent film-forming and wide band-gap properties in optoelectronic applications
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