scholarly journals "Synthesis and Optical Properties of Polystyrene Doped with DCM Thin Films "

2018 ◽  
Vol 5 (1) ◽  
pp. 8-18
Author(s):  
Akeel Shaker Tuhaiwer
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Transition Energy ◽  
Energy Gap ◽  
Electronic Transitions ◽  
Effect Of Temperature ◽  
Casting Method ◽  
Double Beam ◽  
Urbach’S Energy ◽  
Electronic Transition Energy

"In the present work Polystyrene (PS) polymer doped with DCM laser dye thin films have been prepared on glass substrate using casting method. The final samples of PS doped with DCM thin films were treated with different annealing temperatures at (30, 40, 50, 60) oC. Optical absorption and transmission spectra of the prepared thin films were recorded using UV-VIS double beam spectrometer in the wavelength range from 190 to 1100 nm. The results shown that the allowed direct electronic transitions energy gap increased from 2.08 up to 2.25e.V as the temperature increasing from 30 to 60oC, whereas the allowed indirect electronic transition energy gap increase from 2.02 up to 2.17 eV as the temperature increase from 30 to 60oC. The effect of temperature on the optical properties such as Urbach’s energy, Refractive index, Extinction coefficient, Critical angle, Brewster angle, and Finesse coefficient of PS doped with DCM thin films also studied in this work.

scholarly journals Optical Study on Deposed Polystyrene Doped DCM Laser Dye Thin Films at Different Temperature

2016 ◽  
Vol 68 ◽  
pp. 39-47
Author(s):  
Akeel Shaker Tuhaiwer
Keyword(s):  
Thin Films ◽  
Transition Energy ◽  
Energy Gap ◽  
Electronic Transitions ◽  
Effect Of Temperature ◽  
Optical Study ◽  
Laser Dye ◽  
Casting Method ◽  
Annealing Temperatures ◽  
Electronic Transition Energy

Polystyrene (PS) polymer doped with DCM laser dye thin films have prepared on glass substrate using casting method. The obtained PS doped with DCM thin films were treated at different annealing temperatures such (30, 40, 50, 60, 70) °C. It was observed from result that the allowed direct electronic transitions energy gap was increased from 2.21 up to 2.3e.V as the temperature increasing from 30-70°C. And the allowed indirect electronic transition energy gap rose from 0.06 to 0.15e.V as the temperature increasing. The allowed indirect phonon energy also was decreased at the same range of temperature. The different effect of temperature variation was observed on the optical properties of PS doped with DCM thin films.

Studying the Optical Properties of Thin Films Prepared from Polystyrene Doped with DCM Dye

2015 ◽  
Vol 61 ◽  
pp. 178-183 ◽  
Author(s):  
Ahmed Namah Mohamed
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Energy Gap ◽  
Phonon Energy ◽  
Casting Method ◽  
Polymeric Thin Films ◽  
Double Beam ◽  
Direct Energy ◽  
Direct Energy Gap

Polymeric thin films of Polystyrene (PS) doped with DCM laser dye have been prepared using casting method and pure thin films of PS. Optical properties for deposed thin films on glass substrate with 0.237μm was prepared using casting method involved absorptions spectra measurement using UV mate SP-8001 double-beam spectrophotometer covering the wavelengths range 190-1100nm, where the absorption coefficient was calculated and the direct energy gap was 3.9eV for PS thin film, energy gap for PS-DCM thin film was 2.2eV. While for indirect transitions the energy gap for PS thin film was 2.25eV and phonon energy was 0.55eV, but the energy gap for PS-DCM film was 1.4eV and phonon energy was 0.5eV.

scholarly journals "The Effects of Additive TiO2 Nanoparticles on the Optical properties of DCM Doped with PVC Thin Films "

2018 ◽  
Vol 5 (1) ◽  
pp. 27-35
Author(s):  
Shymaa K. Hussian ◽  
Thill A. Kadhum Al-musaw ◽  
Shatha Raheem Helal Al himidi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Tio2 Nanoparticles ◽  
Electronic Transition ◽  
Transition Energy ◽  
Energy Gap ◽  
Sol Gel ◽  
Titania Nanoparticles ◽  
Absorption Region ◽  
Electronic Transition Energy

"In this work thin films containing laser dye (DCM) doped with (PVC) were prepared using casting method. Titania (TiO2) nanoparticles also were synthesized using sol-gel technique. Different titania nanoparticle densities (0.882×1020, 1.765×1020, 2.648×1020 and 3.530×1020 cm-3) were co-doping with dye doped polymer to study the effect of this addition on the optical properties and electronic transition energy gaps in cases of both direct and indirect transitions, Absorbance spectra were measured using Spectrophotometer. Absorption and extinction coefficients as well as the refractive indices have been obtained the spectra of absorbance at the strong absorption region. It was observed from results that the allowed direct electronic transitions energy gap was decreasing from 2.22 to 2.175e.V with the increasing of titania nanoparticles density and the allowed indirect electronic transition energy gap decreasing from 2.19 to 2.13e.V.

scholarly journals The Effects of Additive TiO2 Nanoparticles on the Energy Gap of DCM Doped with PS Thin Films

2016 ◽  
Vol 68 ◽  
pp. 71-81
Author(s):  
Jafer Fahdel Odah
Keyword(s):  
Thin Films ◽  
Energy Gap ◽  
Sol Gel ◽  
Casting Method ◽  
Characteristic Peak ◽  
Co Doping ◽  
Energy Gaps ◽  
Gel Technique ◽  
Doped Polymer ◽  
Electronic Transition Energy

In this work thin films containing laser dye (DCM) doped with polystyrene (PS) were prepared using casting method. Titania (TiO2) nanoparticles also were synthesized using sol gel technique. Characteristics of the tetania were done using XRD patter, and the characteristic peak of anatase is sharper and clear to observe, in particular at 25.40° degree. While scanning electron microscopy (SEM) was used to achieve the morphology of TiO2samples, and to determine the sizes of nanoparticles. Different titania nanoparticle densities (0.882×1020, 1.765×1020, 2.648×1020, 3.530×1020and 4.413×1020cm-3) were co-doping with dye doped polymer and study the effect of this addition on the optical properties and electronic transition energy gaps in cases of both direct and indirect transitions.

scholarly journals Effect of substrate temperature on structural and optical properties of spray deposited ZnO thin films

2015 ◽  
Vol 33 (3) ◽  
pp. 491-496 ◽  
Author(s):  
Y. Larbah ◽  
M. Adnane ◽  
T. Sahraoui
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Energy Gap ◽  
Zno Thin Films ◽  
Effect Of Temperature ◽  
Zno Films ◽  
Spray Pyrolysis Method ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Substrate Temperatures

Abstract Undoped ZnO thin films have been prepared on glass substrates at different substrate temperatures by spray pyrolysis method. The effect of temperature on the structural, morphological and optical properties of n-type ZnO films was studied. The X-ray diffraction (XRD) results confirmed that the ZnO thin films were polycrystalline with wurtzite structure. Scanning electron microscopy (SEM) measurements showed that the surface morphology of the films changed with temperature. The studies demonstrated that the ZnO film had a transmission of about 85 % and energy gap of 3.28 eV at 450 °C. The RBS measurements revealed that ZnO layers with a thickness up to 200 nm had a good stoichiometry.

scholarly journals Photoluminescence Activity of Neodymium-Doped Gallium Oxide Thin Films

2008 ◽  
Vol 1111 ◽  
Author(s):  
Celine Lecerf ◽  
Philippe Marie ◽  
Cedric Frilay ◽  
Julien Cardin ◽  
Xavier Portier
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Substrate Temperature ◽  
Gallium Oxide ◽  
Electronic Transitions ◽  
Oxide Thin Films ◽  
Structural And Optical Properties ◽  
Luminescence Efficiency

AbstractPhotoluminescence activity was observed for neodymium-doped gallium oxide thin films prepared by radiofrequency magnetron co-sputtering. Structural and optical properties of as-grown and annealed films were studied and photoluminescence activity was especially investigated. The most intense lines were associated to the 4F3/2  4I9/2 and 4F3/2  4I11/2 electronic transitions of Nd3+. The effects of deposition and treatment parameters such as the substrate temperature, the post anneal treatment or the neodymium content in the films were particularly examined with the aim to reach the best luminescence efficiency.

Structural and Optical Properties of (PVA/PVP:Sr2NO3) Nanocomposites

2021 ◽  
Vol 19 (4) ◽  
pp. 27-37
Author(s):  
Doaa E. Al-Kateb ◽  
Ali R. Abdulridha
Keyword(s):  
Optical Properties ◽  
Energy Gap ◽  
Ftir Spectra ◽  
Structural And Optical Properties ◽  
Casting Method ◽  
Forbidden Transitions ◽  
Nanoparticles Concentration

In this study preparing and investigating of the (PVA/PVP:Sr2NO3) nanocomposites films by using casting method with different concentration of Sr2NO3 as (0, 1, 3, 5, and 7 wt. %). Optical properties obtained by UV-Vis spectrometer, OM and FTIR spectra have been revealed in this study, the absorbance increased by increasing of Sr2NO3 nanoparticles concentrations, the energy-gap (allowed and forbidden) transitions decreased by increasing of the nanoparticles concentration.

Synthesis, Characterization and Optical Properties of PLA / P3HT Blends Thin Films

2021 ◽  
Vol 19 (5) ◽  
pp. 132-138
Author(s):  
Maan Abd-Alameer Salih ◽  
Q.S. Kareem ◽  
Mohammed Hadi Shinen
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Ring Opening ◽  
Energy Gap ◽  
Ring Opening Polymerization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Conductivity Increase ◽  
Ft Ir

In this exploration Poly lactic corrosive (PLA) was orchestrated the ring-opening polymerization Poly lactic corrosive (PLA) blended with poly(3-hexylthiophene) (P3HT) which prepared by solution. Blends thin films Synthesis by spin coating technique and using Tetrahydrofuran (THF) as solvent. PLA powder was 'characterized by' 'X-ray' 'diffraction', '(FT-IR)'. pure Optical properties (PLA), (PLA)/P3HT blends thin films with different percentage of P3HT (0, 1, 2, and 3) wt% were investigated using UV-VS spectroscopy The results showed that the absorption, absorption coefficient, extinction coefficient and conductivity increase with increasing the rate of deformation P3HT, The energy gap decreases with increasing deformation.

scholarly journals optical proprties of poly crystaline CdS thin films

2005 ◽  
Vol 2 (2) ◽  
pp. 231-235
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Absorption Coefficient ◽  
Energy Gap ◽  
Glass Temperature ◽  
Calculated Energy ◽  
Cds Thin Films ◽  
Temperature Preparation

Studied the optical properties of the membranes CdS thin containing different ratios of ions cadmium to sulfur attended models manner spraying chemical gases on the rules of the glass temperature preparation (350c) were calculated energy gap allowed direct these membranes as observed decrease in the value of the energy gap at reducing the proportion ofsulfur ions as absorption coefficient was calculated

Theoretical investigation on the interaction between groups in LAP crystal and its linear optical properties

2019 ◽  
Vol 33 (15) ◽  
pp. 1950156
Author(s):  
Lei Wang ◽  
Meixia Xiao ◽  
Bingtian Tu
Keyword(s):  
Optical Properties ◽  
First Principles ◽  
Energy Gap ◽  
Electronic Transitions ◽  
Electronic Interaction ◽  
First Principles Calculations ◽  
Nonlinear Optical Material ◽  
Kdp Crystal ◽  
Intergroup Interactions ◽  
Linear Optical Properties

LAP crystal is an excellent nonlinear optical material and it has some unexplained specificities, which makes the interaction between groups in molecule received much attention. In this paper, the first-principles calculations are performed to investigate the intergroup interactions by the electronic structure and optical properties of LAP crystal. The energy gap of LAP crystal is 5.02 eV, indicating that the electronic transition is easier than KDP crystal. The strong electronic interaction between the carboxyl, phosphate and guanidine groups is found. In addition, since the LAP molecule has the greatest dipole in [010] direction and the electronic transitions are most likely to occur between the carboxyl group, phosphate and guanidine groups located on both ends of the molecule along [010] direction, the LAP crystal shows specific optical properties in this direction. The results reveal the correlations between the optical properties and the intergroup interactions of LAP crystal.

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