scholarly journals Evolution of the Excitonic State of DNA Stacked Thymines: Intrabase ππ* → S0 Decay Paths Account for Ultrafast (Subpicosecond) and Longer (>100 ps) Deactivations

2018 ◽  
Vol 9 (9) ◽  
pp. 2373-2379 ◽  
Author(s):  
Irene Conti ◽  
Marco Garavelli
Keyword(s):  
Excitonic State

Excited State Phononic Processes in Semiconductor Nanocrystals Revealed by Excitonic State-Resolved Pump/Probe Spectroscopy

2019 ◽  
Vol 123 (6) ◽  
pp. 3868-3875 ◽  
Author(s):  
Brenna R. Walsh ◽  
Colin Sonnichsen ◽  
Timothy G. Mack ◽  
Jonathan I. Saari ◽  
Michael M. Krause ◽  
...  
Keyword(s):  
Excited State ◽  
Semiconductor Nanocrystals ◽  
Pump Probe ◽  
Excitonic State ◽  
Probe Spectroscopy

Hydration-induced coupling of the excitonic state of Y2O3 with its phonon: Negative effect on the luminescence efficiency of Y2O3:Eu+3 nanophosphor

2007 ◽  
Vol 22 (1) ◽  
pp. 35-39 ◽  
Author(s):  
A. Nayak ◽  
R. Sahoo ◽  
R. Debnath
Keyword(s):  
Volume Ratio ◽  
Contaminated Water ◽  
Particle Sizes ◽  
Red Phosphor ◽  
Excitonic State ◽  
Luminescence Efficiency ◽  
Excitation Profile ◽  
Infrared Studies ◽  
Negative Effect ◽  
Aging In Air

Luminescence properties of a series of samples of Y2O3:Eu+3 red phosphor of particle sizes ranging from 50 to 300 nm were investigated as a function of time to decipher the long-standing mystery of the effect of reduction of particle size on the luminescence efficiency of the phosphor. The samples were found to lose luminescence efficiency and suffer a change in the excitation profile with time. Infrared studies showed that although the samples at their freshly prepared stage were almost free from contaminated water, on aging in air at room temperature, they absorbed the latter. The phenomenon of hydration-induced coupling of the excitonic state of Y2O3 with one of its Fu modes was detected in the case of the aged sample, which was shown to be instrumental in introducing newer nonradiative channels in the system. Because of larger surface-to-volume ratio, the effect was most pronounced in the case of nanocrystalline samples.

Eu and Yb Excitation Mechanisms in ZnS, CaS, SrS and InP

1993 ◽  
Vol 301 ◽  
Author(s):  
M. Godlewski ◽  
K. Światek ◽  
B. Monemar
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Excited State ◽  
Exciton State ◽  
Experimental Results ◽  
Excitation Mechanism ◽  
Core State ◽  
Excitonic State ◽  
Excitation Mechanisms

ABSTRACTThe role of the excitonic excitation mechanism of the rare earth (RE) intra-shell emission is discussed. Two cases are analyzed. For Yb ion in InP 4f-4f emission of Yb3+ is induced by energy transfer from bound exciton state to the RE core state. For Eu in CaS and SrS RE emission is induced by carrier trapping directly to the excited state of Eu2+ ion. Also in this case the intermediate excitonic state may participate in RE excitation, as suggested by some experimental results.

Investigating the transport properties of the excitonic state in quasi-Corbino electron bilayers

2008 ◽  
Vol 40 (5) ◽  
pp. 1034-1037 ◽  
Author(s):  
L. Tiemann ◽  
J.G.S. Lok ◽  
W. Dietsche ◽  
K. von Klitzing ◽  
K. Muraki ◽  
...  
Keyword(s):  
Transport Properties ◽  
Excitonic State

Excitonic-state trapping and quasiadiabatic population transfer in a two-band semiconductor

1999 ◽  
Vol 60 (23) ◽  
pp. 15523-15526 ◽  
Author(s):  
S. Hughes ◽  
W. Harshawardhan ◽  
D. S. Citrin
Keyword(s):  
Population Transfer ◽  
Excitonic State
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