Effect of host polymer blends to phosphorescence emission

Alias, A. N.; Zabidi, Zubainun Mohamed; Ali, Ab Malik Marwan; Yahya, M. Z. A.

doi:10.4314/jfas.v9i6s.39

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…The behavior in Region‐II can be investigated using the Tauc relation, which calculates the changes in the band structure of the amorphous composites by using absorbance data. While the crystal semiconductors have only extended states, amorphous semiconductors have localized states . The width of these localize states depends on the heterogeneity of the composites (i.e., the degree of amorphism) .…”

Section: Resultsmentioning

confidence: 99%

Effects of GNP addition on optical properties and band gap energies of PMMA films

et al. 2018

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In this study, the effects of graphene nanoplatelet (GNP) doping on the optical parameters (absorption coefficient, α and extinction coefficient, k) and the optical transition energies (optical band gap and Urbach energies) of poly(methyl methacrylate)/graphene nanoplatelet (PMMA/GNP) composite films were studied. PMMA/GNP composite films with various GNP mass fractions were prepared by spin coating technique. The absorbance (A) changes of the prepared composites were measured by using UV–Vis technique. The α and k values of the composites were obtained from UV–Vis data. The observed rapid increase in A values in UV‐region were associated with the optical transitions of GNP electrons from valence to conduction band. The direct (Ed) and indirect (Ei) optical band gap energies of the composites were determined by using Tauc method. Both of the band gap energies were decreased when the GNP content in the PMMA matrix is increased. The decrease in the band gap energies was interpreted as evidence of increased conductivity of the composites. Additionally, energies of the band tails (Urbach energy) were calculated. It was seen that the Urbach energy levels were increased with GNP content. POLYM. COMPOS., 40:1862–1869, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Effects of GNP addition on optical properties and band gap energies of PMMA films

et al. 2018

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“…In fact, it is well known that the performance of organic optoelectronic devices is not directly dictated by the photophysical properties of the conjugated molecule itself or their assemblies in a solution medium. This is because the photophysical processes of excited molecules in the condensed solid state are dependent on molecular dynamics, including vibration relaxation, dielectric momentum of the surrounding molecules, and intra‐ or intermolecular resonances …”

Section: Introductionmentioning

confidence: 99%

Chiroptical‐Conjugated Polymer/Chiral Small Molecule Hybrid Thin Films for Circularly Polarized Light‐Detecting Heterojunction Devices

Kim

Kyhm

Han

et al. 2019

Adv Funct Materials

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Herein, a simple and facile strategy is described to obtain chiroptically active semiconductor thin films by blending of poly(3-alkylthiophene)s, which are conventional achiral polymer semiconductors, and 1,1′-binaphthyl (BN), a versatile chiral molecule. As expected, the intermolecular interaction between the two materials is important to extend the chirality of the binaphthyl molecules to the hybrid films. The controlled phase separation and crystallization of poly[3-(6-carboxyhexyl)thiophene-2,5-diyl] (P3CT) and binaphthyl hybrid films result in unique heterojunction bilayer thin-film structures that consisted of BN microcrystals at the top and a P3CT/BN mixed layer at the bottom. Such heterojunction bilayer films exhibit significantly amplified chiroptical response with weak broadened tails, which is due to the enhanced crystallization of the chiral BN molecules and formation of heteroaggregates in the hybrid films. Based on the characterization of crystalline structure and photoluminescence analysis, it is found that new electronic energy states are formed in the conduction band region of P3CTs in the P3CT/BN heteroaggregates, which contribute to chirality transfer from BN to the hybrid films. As a proof of concept, a photodiode capable of distinguishably sensing the leftand right-handed circularly polarized light is successfully fabricated by using the hybrid films with the heterojunction bilayer structure.

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Effect of host polymer blends to phosphorescence emission

Cited by 2 publications

References 15 publications

Effects of GNP addition on optical properties and band gap energies of PMMA films

Effects of GNP addition on optical properties and band gap energies of PMMA films

Chiroptical‐Conjugated Polymer/Chiral Small Molecule Hybrid Thin Films for Circularly Polarized Light‐Detecting Heterojunction Devices

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