Excitation-Wavelength-Dependent and Substrate-Dependent Photoluminescence From the Nonconjugated Polymeric Thin Film With Self-Assembly Nanoparticles

Nonconjugated polymers have been synthesized from maleic anhydride, poly(ethylene glycol), and bisphenol-diglycidyl ether without utilizing any solvent. The polymeric thin films produced by the nonconjugated polymers were spin-coated on ITO coated glass and Si substrates. Self-assembly nanoparticles...

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Bibliographic Details
Published in:IEEE photonics journal 2018-12, Vol.10 (6), p.1-8
Main Authors: Huang, Chia-Hong, Chang, Chung-Cheng, Lee, Kwang-Ming, Wang, Jia-Ming, Liu, Cheng-Yen
Format: Article
Language:English
Subjects:
Anhydrides
Bisphenol A
Blue shift
Chemical synthesis
dielectric screening
Excitation
Glass substrates
Maleic anhydride
Molecular orbitals
Nanoparticles
Optoelectronics
Photoluminescence
Plastics
Polyethylene glycol
Polymer films
Polymeric thin films
Polymers
Self-assembly
self-assembly nanoparticles
Silicon substrates
Size distribution
Solvents
Spin coating
Substrates
Thin films
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Summary:Nonconjugated polymers have been synthesized from maleic anhydride, poly(ethylene glycol), and bisphenol-diglycidyl ether without utilizing any solvent. The polymeric thin films produced by the nonconjugated polymers were spin-coated on ITO coated glass and Si substrates. Self-assembly nanoparticles (1.6-6.2 nm) are observed. It is proposed that the nanoparticle is constructed through a self-assembly process with bisphenol-A aggregates and poly(ethylene glycol) moieties. The photoluminescence spectrum of the polymeric thin film on ITO peaks at near 450 nm that spans from 360 to 610 nm under 266 nm excitation. The polymeric thin film exhibits the excitation-wavelength-dependent photoluminescence that the emission peak shifts toward longer wavelength (about 11 nm) when the excitation wavelength increases from 266 to 325 nm, which is attributed to nanoparticle size distribution. Meanwhile, the substrate-dependent photoluminescence has been also observed that the PL peak of the polymeric thin film spin-coated on Si shows a blue shift (about 9 nm) compared with that on ITO, which probably arises from the dielectric screening. The highest occupied molecular orbital energy of the polymeric thin film is about -9.4 eV. The optical band gap is about 3.28 eV. The nonconjugated polymer is expected to use as a host material in optoelectronic applications.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2018.2883389