Optical Spectroscopic Studies of Perylene Dye Doped in Copolymer of ST/MMA as Solar Collector

Mansour, Ahmed; Ahmed, R. M.; Bassyouni, A. H.; Nasr, G. M.

doi:10.1080/00914030601098652

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…In this region the absorption process is ascribed to the transitions between extended states in one band and localized states in the exponential tail of the other band [19]. The Urbach energy was calculated from the following empirical formula that we developed previously [20]:…”

Section: Interband Transitionsmentioning

confidence: 99%

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

2020

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In the present research work a solution casting technique was utilized to fabricate various blends of polyvinyl alcohol (PVA)/polyethylene glycol (PEG). Embedding PEG in PVA resulted in obvious shifts in the absorption edge which points to a decrease in the energy gap values based on PEG content. Loss of the photon energy was a consequence of increasing the extinction coefficient at high wavelengths. The PEG content increased the refractive index of the PVA in the produced PVA/PEG blends. The direct and indirect energy gap values were decreased whereas the Urbach energy values were increased with increasing the PEG content. The exact electron transition which is responsible for the absorption process was determined successfully based on the complex optical dielectric functions. In addition, some other optical parameters were estimated to more understand fully the effect of embedding the PEG in the PVA. The Fourier transform infra red spectroscopy was used to determine the characteristic functional groups of both the PVA and the PEG.

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Section: Interband Transitionsmentioning

confidence: 99%

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

2020

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“…In this region, the absorption process is due to the transitions between extended states in one band and localized states in the exponential tail of the other band [1]. The Urbach energy was calculated from the following empirical formula [14]:…”

Section: Uv-visible Spectroscopymentioning

confidence: 99%

“…The penetration depth (δ) is known as skin depth and it expresses the exact distance that the electromagnetic wave can penetrate in to the polymeric material. The penetration depth was estimated by using the following relation [24]: (14) Where α is the absorption coefficient. Fig.…”

Section: Penetration Depthmentioning

confidence: 99%

Effect of Cobalt Chloride on the Optical Properties of PVA/PEG Blend

Ahmed

Ibrahiem

El-sayd

2018

Arab Journal of Nuclear Sciences and Applications

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Different composite films of cobalt chloride (CoCl 2) embedded in a blend of (poly vinyl alcohol (PVA) /poly ethylene glycol (PEG) 72/28 wt. %) were prepared by the solution casting technique. Fourier Transform infrared (FT-IR) spectroscopy was used to identify the effect of CoCl 2 on the characteristic functional groups of both PVA and PEG. A shift in the absorption edge of the pure blend was observed by adding CoCl 2 which indicates a decrease in the energy gap (E g) values based on the CoCl 2 content. By increasing the content of CoCl 2 , the refractive index, the Urbach energy, the dispersion parameters, the moments of the optical spectrum and the static dielectric constants show a reduction in their values compared to those of the pure blend. The oscillator energy gap E o equals about 2.23 E g , for the different composites. The calculated values of the penetration depth, for all the composites, exhibit an increase by increasing the wavelength whereas they decrease in the region of the absorption band of the CoCl 2 from 420 nm to 750 nm depending on the CoCl 2 content. The optical conductivity of the composites has been increased in the region of the absorption band of the CoCl 2 .

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Organic Fluorophores for Luminescent Solar Concentrators

Beverina¹,

Sanguineti²

2013

Solar Cell Nanotechnology

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Optical Spectroscopic Studies of Perylene Dye Doped in Copolymer of ST/MMA as Solar Collector

Cited by 4 publications

References 16 publications

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

Enhancing the Optical Properties of Polyvinyl Alcohol by Blending It with Polyethylene Glycol

Effect of Cobalt Chloride on the Optical Properties of PVA/PEG Blend

Organic Fluorophores for Luminescent Solar Concentrators

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