scholarly journals Line shape of emission spectra of the luminescent polymer poly(p-phenylene vinylene)

2002 ◽  
Vol 32 (2b) ◽  
pp. 570-574 ◽  
Author(s):  
A. Marletta ◽  
F. E. G. Guimarães ◽  
R. M. Faria
Keyword(s):  
Line Shape ◽  
Emission Spectra ◽  
Phenylene Vinylene ◽  
Luminescent Polymer

scholarly journals Effect of a Polymeric Protective Coating on Optical and Electrical Properties of Poly(p-phenylene vinylene) Derivatives

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
V. C. Gonçalves ◽  
C. A. Olivati ◽  
A. J. F. Carvalho ◽  
D. T. Balogh
Keyword(s):  
Electrical Properties ◽  
Protective Coating ◽  
Vinyl Alcohol ◽  
Light Exposure ◽  
Emission Spectra ◽  
Phenylene Vinylene ◽  
Poly Vinyl Alcohol ◽  
Optical And Electrical Properties ◽  
Luminescent Polymer

The resistance to photodegradation of poly[(2-methoxy-5-n-hexyloxy)-p-phenylene vinylene] (OC1OC6-PPV) films was significantly enhanced by the use of poly(vinyl alcohol) 99% hydrolyzed as protective coating. The deposition of poly(vinyl alcohol) onto OC1OC6-PPV films did not affect the absorption and the emission spectra of the luminescent polymer. The protected film showed 5% drop on the absorbance at 500 nm after 270 hours of light exposure while the unprotected film completely degraded in the same conditions. The conductivity of the protected film remained stable (around7×10−10 S/m) while the value for the unprotected one dropped around two orders of magnitude after 100 hours of light exposure.

Temperature Dependent Vibronic Structures in the Emission Spectra of Poly( p -Phenylene Vinylene)

2002 ◽  
Vol 374 ◽  
pp. 427-432 ◽  
Author(s):  
C. A. M. Borges ◽  
A. Marletta ◽  
R. M. Faria ◽  
F. E. G. Guimaraes
Keyword(s):  
Emission Spectra ◽  
Phenylene Vinylene ◽  
Temperature Dependent

Photo and Electroluminescent Properties of a Porphyrin-Poly(p-Phenylene Vinylene) Derivative

1999 ◽  
Vol 598 ◽  
Author(s):  
J. Morgado ◽  
R. Iqbal ◽  
G. Yahioglu ◽  
L. R. Milgrom ◽  
S. C. Moratti ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solid State ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Phenylene Vinylene ◽  
Efficient Energy Transfer ◽  
Light Emitting ◽  
Efficient Energy ◽  
Small Absorption ◽  
Pl Emission

ABSTRACTThe solid state luminescent properties of new statistical copolymers of 2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene and a porphyrin-substituted phenylene vinylene are reported. The photoluminescence, PL, emission shows an efficient energy transfer to the porphyrin, in spite of the small absorption coefficient of the porphyrin in the wavelength range of the poly [2-methoxy-5-(2'- ethylhexyloxy)-1,4-phenylene vinylene], MEH-PPV, emission. At a porphyrin content of 0.25%, by weight, the emission is already dominated by the porphyrin. The PL efficiency of these copolymers is significantly reduced from the value of 13% for MEH-PPV down to 3% for the copolymer with 10.84% of porphyrin. Efficient energy transfer is also observed in the emission spectra of light-emitting diodes.

FORMATION OF SELF-ASSEMBLED MONOLAYERS ON GOLD SURFACES BY LUMINESCENT OLIGO (PARA-PHENYLENE-VINYLENE)-METHANETHIOL

2003 ◽  
Vol 02 (04n05) ◽  
pp. 239-244
Author(s):  
TIEN-TZU LIANG ◽  
HIROAKI AZEHARA ◽  
TAKAO ISHIDA ◽  
WATARU MIZUTANI ◽  
HIROSHI TOKUMOTO
Keyword(s):  
Uv Light ◽  
Emission Spectra ◽  
Blue Shift ◽  
Self Assembled Monolayers ◽  
Phenylene Vinylene ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Gold Surfaces ◽  
Assembled Monolayers ◽  
Self Assembled

Oligo(para-phenylene-vinylene)-methanethiol of trimer and dimer have been synthesized to prepare monolayers onto Au(111). The trimer diluted in dichloromethane glows with a brilliant blue fluorescence when excited with UV light (365 nm). The absorption and emission spectra of the dimer diluted in CH 2 Cl 2 show a blue shift. The molecular level morphologies of the monolayers prepared on gold surfaces were probed by scanning tunneling microscopy or atomic force microscopy (AFM). The dimer is entire trans isomer, which formed highly ordered self-assembled monolayers (SAMs) on Au. The trimer is a mixture of cis–trans isomers, and did not form ordered monolayers on Au. However, the trimer molecules could be embedded in dodecanethiol SAM, and showed higher conductance than oligo(para-phenylene) molecules characterized using a conductive AFM.

scholarly journals On the line shape of the total rovibronic absorption in laser-dressed diatomic molecules

2021 ◽  
Author(s):  
Gabor Halász ◽  
Tamás Szidarovszky ◽  
Agnes Vibok
Keyword(s):  
High Resolution ◽  
Line Shape ◽  
Probability Function ◽  
Numerical Models ◽  
Diatomic Molecules ◽  
Emission Spectra ◽  
Basis Functions ◽  
Total Absorption ◽  
Absorption Probability ◽  
Intensity Laser

Recently, the rovibronic absorption and emission spectra of diatomic molecules dressed by medium-intensity laser fields have been discussed. By computing the total absorption probability as a function of dressing wavelength an asymmetric line shape has been obtained strongly resembling to the well-known Fano line shape. Applying two-state analytical and three-state numerical models the shape of the total absorption probability function is explained. Further confirmation of the model based results is provided by high resolution accurate numerical computations using large number of basis functions.

RESONANT Lα X-RAY RAMAN SCATTERING SPECTRA OF CeF3, CeO2andCeB6

2002 ◽  
Vol 09 (02) ◽  
pp. 1059-1064 ◽  
Author(s):  
S. NAKAI ◽  
T. WATANABE ◽  
K. SASAKI ◽  
T. IWASAKI ◽  
M. ODAKA ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Raman Scattering ◽  
Shape Analysis ◽  
Line Shape ◽  
Emission Spectra ◽  
Edge Region ◽  
X Ray ◽  
Line Shape Analysis ◽  
Scattering Spectra ◽  
Raman Scattering Spectra

Resonant Lα emission spectra of Ce compounds, CeF 3, CeO 2 and CeB 6, were measured around the LIII absorption threshold. As the energy of the incident photon is tuned at the pre-edge region and at the absorption peaks of the Ce LIII absorption spectrum, the Raman peaks are resonantly enhanced. Obtained spectra are decomposed into Raman and normal Lα emission peaks by line shape analysis. The results show that the Raman spectra provide more detailed information than the absorption spectra about the 4f configuration of Ce compounds.

scholarly journals H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison

2018 ◽  
Author(s):  
Roshin Raj Sheeba ◽  
Mohammed Koubiti ◽  
Nelly Bonifaci ◽  
Franck Gilleron ◽  
Caroline Mossé ◽  
...  
Keyword(s):  
Experimental Data ◽  
Line Shape ◽  
Line Emission ◽  
Emission Spectra ◽  
Diagnostic Techniques ◽  
Helium Plasma ◽  
Plasma Parameters ◽  
Spectroscopic Diagnostics ◽  
Best Fit ◽  
Fitting Parameters

Many spectroscopic diagnostics are routinely used as a technique to infer the plasma parameters from line emission spectra but their accuracy depends on the numerical model or code used for the fitting process. However, the validation of a line shape code requires some steps : comparison of the line shape code with other similar codes for some academic (simple) cases and then more complex ones, comparison of the fitting parameters obtained from the best fit of the experimental spectra with those obtained with other diagnostic techniques and/or comparison of the fitting parameters obtained by different codes to fit the same experimental data. Here we compare the profiles of the hydrogen Balmer β line in a helium plasma computed by six codes for a selected set of plasma parameters and we report on the plasma parameters inferred by each of them from the fitting to a number of experimental spectra measured in a helium corona discharge where the pressure was in the range 1- 5 bar.

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