Optical Properties and Characterization of Eu3+ Activated Pmma:Paac Copolymer Samples: Eu Concentration Effects

1999 ◽  
Vol 560 ◽  
Author(s):  
R. Sosa F. ◽  
M. Flores ◽  
R. Rodríguez T. ◽  
A. Munoz F.
Keyword(s):  
Optical Properties ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Fluorescence Decay ◽  
Polymerization Process ◽  
Concentration Effects ◽  
Visible Absorption ◽  
Properties And Characterization ◽  
Decay Times ◽  
Fluorescence Decay Times

ABSTRACTSamples of Eu3+ -activated PMMA:PAAc copolymers were prepared in order to investigate their spectroscopic properties. The densities, refractive indices, UV-Visible absorption and emission spectra and fluorescence decay times were obtained experimentally. These data were used in conjunction with Judd-Ofelt theory to calculate the spontaneous emission probabilities and branching ratios, as a function of the europium content. The range of the concentration was 0.1 to 2.5 % mol. Our results are combined with previous information on the optical properties of rare-earth activated polymers in order to get a better understanding of the role played by the Eu3+ ions on the polymerization process in our samples.

Optical Properties and Characterization of Eu3+ Activated Pmma:Paac Copolymer Samples: Eu Concentration Effects

1999 ◽  
Vol 558 ◽  
Author(s):  
R. Sosa F. ◽  
M. Flores ◽  
R. Rodríguez T. ◽  
A. Muñoz F.
Keyword(s):  
Optical Properties ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Fluorescence Decay ◽  
Polymerization Process ◽  
Concentration Effects ◽  
Visible Absorption ◽  
Properties And Characterization ◽  
Decay Times ◽  
Fluorescence Decay Times

ABSTRACTSamples of Eu3+-activated PMMA:PAAc copolymers were prepared in order to investigate their spectroscopic properties. The densities, refractive indices, UV-Visible absorption and emission spectra and fluorescence decay times were obtained experimentally. These data were used in conjunction with Judd-Ofelt theory to calculate the spontaneous emission probabilities and branching ratios, as a function of the europium content. The range of the concentration was 0.1 to 2.5 % mol. Our results are combined with previous information on the optical properties of rare-earth activated polymers in order to get a better understanding of the role played by the Eu3+ ions on the polymerization process in our samples.

Fluorescence decay times of rare earth ions in silicate glass as functions of temperature

1980 ◽  
Vol 12 (3) ◽  
pp. 263-266 ◽  
Author(s):  
E.J. Fairley ◽  
A.R. Spowart ◽  
B. Blanzat ◽  
J.P. Denis
Keyword(s):  
Rare Earth ◽  
Silicate Glass ◽  
Fluorescence Decay ◽  
Rare Earth Ions ◽  
Decay Times ◽  
Fluorescence Decay Times

Fluoreszenz -Untersuchungen an Distyrylbenzolen

1988 ◽  
Vol 43 (6) ◽  
pp. 583-590 ◽  
Author(s):  
Dieter Oelkrug ◽  
Klaus Rempfer ◽  
Ellen Prass ◽  
Herbert Meier
Keyword(s):  
Singlet State ◽  
Fluorescence Decay ◽  
Excited Singlet State ◽  
Quantum Yields ◽  
Excited Singlet ◽  
Fluorescence Quantum Yields ◽  
Forbidden Transition ◽  
Decay Times ◽  
Fluorescence Decay Times

Abstract The absorption and fluorescence of three isomeric distyrylbenzenes are investigated as function of temperature. From the fluorescence decay times and fluorescence quantum yields two classes of oligostyrylarenes can be distinguished. A decisive criterion for this classification is, whether the first excited singlet state S1 belongs to an allowed or forbidden transition S0→S1.

Interpretation der Absorptionsspektren von Aza- und Azinium-substituierten Anthracenen / The Interpretation of Absorption Spectra of Aza- and Azinium-Substituted Anthracenes

1981 ◽  
Vol 36 (1) ◽  
pp. 30-33 ◽  
Author(s):  
J. Bendig ◽  
D. Kreysig ◽  
A. Kawski
Keyword(s):  
Absorption Spectra ◽  
Fluorescence Decay ◽  
Decay Times ◽  
Fluorescence Decay Times

The absorption spectra of the 3 isomeric aza- and the 4 isomeric azinium-anthracenes are discussed on the basis of the absorption anisotropy, the oscillator strenght and the fluorescence decay times. The influence of endocyclic substitution depends on the position of the aza- and aziniumgroup, respectively. In the case of acridine, acridinium, benzo[g]quinolinium and benzo[f]- isoquinolinium the S0 → S2-transition is observable. The spectra of benzo[g]quinoline, benzo[f]- isoquinoline and acridizinium are similar to those of anthracene

Measurement of Organic Fluorescence Decay Times

1954 ◽  
Vol 44 (3) ◽  
pp. 238 ◽  
Author(s):  
C. F. Ravilious ◽  
R. T. Farrar ◽  
S. H. Liebson
Keyword(s):  
Fluorescence Decay ◽  
Decay Times ◽  
Fluorescence Decay Times

Fluorescence Decay Times: Proteins, Coenzymes, and Other Compounds in Water

Science ◽  
1967 ◽  
Vol 156 (3777) ◽  
pp. 949-951 ◽  
Author(s):  
R. F. Chen ◽  
G. G. Vurek ◽  
N. Alexander
Keyword(s):  
Fluorescence Decay ◽  
Decay Times ◽  
Fluorescence Decay Times
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