Fluorescence lifetimes and predissociation of the A3? state of SH+

1988 ◽  
Vol 7 (4) ◽  
pp. 373-378 ◽  
Author(s):  
O. Gustafsson ◽  
M. Larsson ◽  
P. Sigray
Keyword(s):  
Fluorescence Lifetimes

Dimensionally-Controlled Hydrothermal Tm3+-doped Oxidic Nanocrystals and Their Photoluminescence Properties

2010 ◽  
Vol 1247 ◽  
Author(s):  
Rocío Calderón-Villajos ◽  
Carlos Zaldo ◽  
Concepción Cascales
Keyword(s):  
Single Crystals ◽  
Fluorescence Lifetimes ◽  
Photoluminescence Properties ◽  
Reaction Conditions ◽  
Hydrothermal Processes ◽  
Bulk Single Crystals ◽  
Template Free ◽  
Reaction Media

AbstractControlled reaction conditions in simple, template-free hydrothermal processes yield Tm-Lu2O3 and Tm-GdVO4 nanocrystals with well-defined specific morphologies and sizes. In both oxide families, nanocrystals prepared at pH 7 reaction media exhibit photoluminescence in ∼1.95 μm similar to bulk single crystals. For the lowest Tm3+ concentration (0.2 % mol) in GdVO4 measured 3H4 and 3F4 fluorescence lifetimes τ are very near to τrad.

Fluorescence lifetimes of neodymium-doped glasses and glass-ceramics

1973 ◽  
Vol 77 (8) ◽  
pp. 1016-1018 ◽  
Author(s):  
Charles F. Rapp ◽  
John Chrysochoos
Keyword(s):  
Glass Ceramics ◽  
Fluorescence Lifetimes ◽  
Doped Glasses

Influence of the refractive index on EGFP fluorescence lifetimes in mixtures of water and glycerol

2001 ◽  
Author(s):  
Klaus Suhling ◽  
Daniel M. Davis ◽  
Zdenek Petrasek ◽  
Jan Siegel ◽  
David Phillips
Keyword(s):  
Refractive Index ◽  
Fluorescence Lifetimes ◽  
Egfp Fluorescence

Evaluating the impact of doping concentration on the performance of in-band pumped thulium-doped fiber amplifiers

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mustafa A. Khamis
Keyword(s):  
Fluorescence Quenching ◽  
Doping Concentration ◽  
Fluorescence Decay ◽  
Fiber Amplifiers ◽  
Silica Fiber ◽  
Fluorescence Lifetimes ◽  
Negative Effects ◽  
Ion Interactions ◽  
Cross Relaxation Process ◽  
The Impact

Abstract This study is to investigate the impact of thulium concentration on the performance of in-band pumped thulium-doped silica fiber amplifiers with considering ion–ion interactions. Due to the fluorescence quenching in silica glass, the fluorescence lifetimes are required to compute at every Tm concentration. The theoretical model of fluorescence decay curves at in-band pumped thulium-doped silica fiber is used to determine the fluorescence lifetimes of the 3F4 and 3H4 levels. The calculated lifetimes of the commercially available thulium-doped silica fiber are 650 µs for 3F4 level and 14 µs for 3H4 level and these results are consentient well with the experimental reported results. The theoretical evaluating of the amplifier performance shows that the gain amplifier reduces with concentration increase because of the impact of both fluorescence quenching and the reverse cross-relaxation process. Thus, in contrast to pumping wavelength at 790 nm, there are negative effects of the high doping concentration of Tm ions on the amplifier performance at the in-band pumping scheme.

scholarly journals A study of the low-lying singlet and triplet electronic states of chlorophyll A and B

2013 ◽  
Vol 78 (11) ◽  
pp. 1775-1787 ◽  
Author(s):  
Mihajlo Etinski ◽  
Milena Petkovic ◽  
Miroslav Ristic
Keyword(s):  
Chlorophyll A ◽  
Density Functional ◽  
Chlorophyll B ◽  
Fluorescence Lifetimes ◽  
Functional Theory ◽  
Chlorophyll A And B ◽  
Vertical Ionization Potentials ◽  
Density Functional Theory Optimization ◽  
Triplet Formation ◽  
Good Agreement

Chlorophylls have been extensively investigated both experimentally and theoretically owing to the fact that they are essential for photosynthesis. We have studied two forms of chlorophyll, chlorophyll a and chlorophyll b, by means of density functional theory. Optimization of S0, S1 and T1 states was performed with the B3-LYP functional. The computed fluorescence lifetimes show good agreement with the available experimental data. The electronic adiabatic energies of S1 and T1 states are 2.09/2.12 and 1.19/1.29 eV for chlorophyll a and chlorophyll b respectively. We discussed the implications of this results on the triplet formation. Also, the calculated vertical ionization potentials shows good agreement with the experimental results.

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