Structural and optical properties of vacuum deposited thin films of (E)[α(2,5 dimethylfuryl) ethylidene] (dicyclopropyl methylene) 2,5 furadione

El-Nahass, M.M.; Zeyada, H.M.; Hendi, A.A.

doi:10.1016/s0925-3467(03)00215-5

Cited by 28 publications

(15 citation statements)

References 20 publications

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“…This behavior was observed by other authors [12,14]. These effects are interesting for the fabrication of diffractive optical elements or integrated optical components [12,29].…”

Section: Optical Constant Characterizationsupporting

confidence: 79%

“…The oscillations in the values of T(l) and R(l) are a result of light interference in the considered wavelength range, one can conclude also that the light is not dispersed and this indicates that the films are homogenous [29]. The homogeneity of the films means that the thickness and/or the refractive index are uniform, also in thin transparent films.…”

Section: Optical Constant Characterizationmentioning

confidence: 78%

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Optical and photoluminescence properties of Ga doped ZnO nanostructures by sol-gel method

et al. 2012

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Zinc oxide (ZnO) nanocrystallites with different Ga-doping levels were successfully prepared by spin coating sol-gel technique. The morphological properties of Ga doped ZnO films were studied by atomic force microscopy (AFM). Alignment of ZnO nanorods with respect to the substrate depends on the amount of Ga dopant content. The dopant content varies from 1 % to 4 %, based on Ga-doping levels. The optical properties of the ZnO nanocrystallites following Ga-doping were also investigated by UV-Visible absorption and Photoluminescence spectra. Our results indicate that Gadoping can change the energy-band structure and effectively adjust the intensity of the luminescence properties of ZnO nanocrystallites. Transmittance spectra of the films indicate that the films have high transparency. The refractive index dispersion was analyzed by single oscillator model developed by Wemple and DiDomenico. The oscillator energy, dispersion energy, high frequency dielectric constant values for the films were determined were calculated and it is found that the optical parameters are changed with Ga-doping content.

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“…This behavior was observed by other authors [12,14]. These effects are interesting for the fabrication of diffractive optical elements or integrated optical components [12,29].…”

Section: Optical Constant Characterizationsupporting

confidence: 79%

Section: Optical Constant Characterizationmentioning

confidence: 78%

Optical and photoluminescence properties of Ga doped ZnO nanostructures by sol-gel method

et al. 2012

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“…The dispersion plays an important role in the research for optical materials, because it is a significant factor in optical communication and in designing devices for spectral dispersion. The result of refractive index dispersion below the interband absorption edge corresponds to the fundamental electronic excitation spectrum [21,22] Wemple and Di Domenico [23] have analyzed refractive index data below the interband absorption edge using the single effective oscillator equation…”

mentioning

confidence: 99%

Optical properties of pure and metal ions doped ammonium sulfate single crystals

El‐Fadl

Anooz

2006

Cryst. Res. Technol.

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A study of the optical properties of pure-and some metal ions doped ammonium sulfate crystals (AS) were made. Optical constants of AS crystals were calculated at room temperature. The optical absorption coefficient (α) was analyzed and interpreted to be in the allowed direct transition. The introduction of Rb + or Cs + ions gives rise to an intense charge transfer band with a maximum at λ= 310 nm in the optical spectrum. In case of Cr 3+ -doping, the absorption shows a shoulder just before the onset band to band transition. The values of the allowed direct energy gap E g for undoped and doped crystals were calculated. It was found that E g values were decreased with metal ions doping. The refractive index, the extinction coefficient and both the real and imaginary parts of the dielectric permittivity were calculated as a function of photon energy. The validity of Cauchy-Sellimeier equation was checked in the wavelength range 4.9 -5.6 eV and its parameters were calculated. Applying the Single-Effective-Oscillator model, the moments of ε(E) could be estimated.

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“…UV-VIS absorption spectra of the unirradiated and irradiated films were carried out at room temperature in the wavelength range (190-650 nm). In addition, both the transmittance (T) and the reflectance (R ) were measured at normal incidence in the spectral range from 190 to 1500 nm, using a double beam spectrophotometer (JASCO model V-670 UV-VIS-NIR) attached with constant angle specular reflection attachment (5 o ).The analysis of the obtained data of T,R and A were carried out in a similar manner as published before [10,12]. The relative uncertainty in the transmittance and reflectance given by the manufacturer was 1%.…”

Section: Fig 1(a)mentioning

confidence: 99%

“…These compounds are considered as promising candidates in photoswitchable system which require high reversibility [1][2][3][4][5][6][7][8][9][10][11] and in optical memory devices which depending on non -destructive readout stability [5][6][7]. Through all photochromic candidates; Fulgides showed a reversible photochromism with minimum photochemical fatigue [2,8], thermal stability [9] and nondestructive readout stability .The photochromism of fulgide occurs between the open E-isomer and the photocycle colored form(C-isomer) [2,[5][6][7].…”

Section: Introduction:-mentioning

confidence: 99%

The Determination of the Coloring Centers through Casting (C-DCPF )5% - (PMMA) Film and New Optical Comparative Studying With its E-isomer.

Nahass.¹,

Barry²,

Hady³

2017

IJAR

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Filmsof 5% E-dicyclopropyl-methylene-(2,5-dimethyl-3-furylethylidene-succinic anhydride (E-DCPF) doped in PMMA polymer films, [E -(DCPF ) -(PMMA) films], were prepared by casting method and then were irradiated with UV light (360 nm) for different exposure time (2-38 min). The color of the films turned to deep pink after 38 min. The photo-bleaching time was 670 min. The absorbance spectrum was studied in the range from 190 nm up to 650 nm, where that spectrum showed four peaks. The onset one was related to the photo coloration effect at 516.44 nm,where it was increased in height and decreased in its width by the increasing of the exposure time of UV-Irradiation . The other three peaks were at 363 nm, 272.85 and 218 nm respectively. The spectra have an isosbestic point at (417 nm).The optical properties of the films were investigated using the spectrophotometric measurements of both the transmittance and reflectance in the spectral range from 400 to 1500 nm . Both the refractive index, n, and the absorption index, k, were calculated before and after coloration.For the first time ;the parameters of the molar extinction coefficient (ε molar )[oscillators energy (E 0s ), oscillator strength (f), electronic dipole strength (q 2 ) and the concentration of the coloring centers were evaluated. The analysis of the absorption coefficient (α) revealed three indirect transitions and only one direct transition for photo -bleached films ,while two indirect transitions and only one direct transition for colored films . …………………………………………………………………………………………………….... Introduction:-Dicyclopropyl fulgide (DCPF) has attracted a great attention because it is an important one of the organic photochromic compounds. These compounds are considered as promising candidates in photoswitchable system which require high reversibility [1][2][3][4][5][6][7][8][9][10][11] and in optical memory devices which depending on non -destructive readout stability [5][6][7]. Through all photochromic candidates; Fulgides showed a reversible photochromism with minimum photochemical fatigue [2,8], thermal stability [9] and nondestructive readout stability .The photochromism of fulgide occurs between the open E-isomer and the photocycle colored form(C-isomer) [2,[5][6][7]. The molecular structure for E&C (isomers) of DCPF is shown in Fig.1(a)

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Structural and optical properties of vacuum deposited thin films of (E)[α(2,5 dimethylfuryl) ethylidene] (dicyclopropyl methylene) 2,5 furadione

Cited by 28 publications

References 20 publications

Optical and photoluminescence properties of Ga doped ZnO nanostructures by sol-gel method

Optical and photoluminescence properties of Ga doped ZnO nanostructures by sol-gel method

Optical properties of pure and metal ions doped ammonium sulfate single crystals

The Determination of the Coloring Centers through Casting (C-DCPF )5% - (PMMA) Film and New Optical Comparative Studying With its E-isomer.

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