scholarly journals Accumulation of electric-field-stabilized geminate polaron pairs in an organic semiconductor to attain high excitation density under low intensity pumping

2006 ◽  
Vol 89 (19) ◽  
pp. 193502 ◽  
Author(s):  
N. C. Giebink ◽  
S. R. Forrest
Keyword(s):  
Electric Field ◽  
Organic Semiconductor ◽  
Excitation Density ◽  
High Excitation ◽  
Low Intensity

Influence of an electric field and a high excitation density on the luminescence of epitaxial GaN films

1998 ◽  
Vol 40 (5) ◽  
pp. 862-863
Author(s):  
M. A. Yakobson ◽  
D. K. Nel’son ◽  
E. V. Kalinina
Keyword(s):  
Electric Field ◽  
Excitation Density ◽  
High Excitation

The effect of intermediate layers on the internal electric field in organic semiconductor devices

2006 ◽  
Author(s):  
Christoph Lungenschmied ◽  
Gilles Dennler ◽  
Eitan Ehrenfreund ◽  
Helmut Neugebauer ◽  
Niyazi Serdar Sariciftci
Keyword(s):  
Electric Field ◽  
Organic Semiconductor ◽  
Semiconductor Devices ◽  
Internal Electric Field ◽  
Intermediate Layers ◽  
Organic Semiconductor Devices

Low intensity electric field inactivation of Gram-positive and Gram-negative bacteria via metal-free polymeric composite

2019 ◽  
Vol 99 ◽  
pp. 827-837 ◽  
Author(s):  
Fernando A.G. da Silva Jr. ◽  
Jose Jarib Alcaraz-Espinoza ◽  
Mateus M. da Costa ◽  
Helinando P. de Oliveira
Keyword(s):  
Electric Field ◽  
Polymeric Composite ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Metal Free ◽  
Low Intensity

scholarly journals Temperature dependence of ultrasharp luminescence lines in AlyIn1−yAs/AlxGa1−xAs self-assembled quantum dots

1996 ◽  
Vol 74 (S1) ◽  
pp. 216-219 ◽  
Author(s):  
S. Raymond ◽  
S. Fafard ◽  
S. Charbonneau
Keyword(s):  
Quantum Dots ◽  
Ground State ◽  
State Transition ◽  
Thermionic Emission ◽  
Excitation Density ◽  
High Excitation ◽  
Temperature Dependent ◽  
Time Resolved ◽  
Self Assembled ◽  
Intensity Evolution

Ensembles of~600 AlyIn1−yAs/AlxGa1−xAs self-assembled quantum dots (QDs) are investigated using photoluminescence (PL) and time-resolved PL in the visible. At very low excitation intensities, the PL spectrum shows multiple ultranarrow luminescence lines (FWHM ~200 μeV), which are attributed to the ground-state transition of a few dots (4 or less). The temperature and intensity evolution of these sharp lines is then monitored. The temperature-dependent measurements show that the line width and lifetime of the narrow lines remain constant up to the onset of thermionic, emission. Intensity-dependent measurements show that for high excitation density the collective background, emitted by the ensemble of QDs, is enhanced relative to the amplitude of individual ultranarrow lines.

Differentiating the roles of shrimp and aquatic insects in leaf processing in a Neotropical stream

2017 ◽  
Vol 68 (9) ◽  
pp. 1695 ◽  
Author(s):  
Claudia M. Andrade ◽  
Vinicius Neres-Lima ◽  
Timothy P. Moulton
Keyword(s):  
Electric Field ◽  
Aquatic Insects ◽  
Behavioural Response ◽  
Control Treatment ◽  
Behavioural Inhibition ◽  
Leaf Breakdown ◽  
Ecological Processes ◽  
Low Intensity ◽  
Leaf Processing ◽  
Neotropical Stream

There is interest in the relationships between macroconsumers (e.g. shrimp) and aquatic insects, as well as their role in ecological processes, including leaf breakdown, in tropical freshwater environments. Many studies have shown that shrimp have the capacity to reduce the abundance of aquatic insects (by predation and behavioural inhibition) and promote leaf breakdown as shredders. To discriminate between these effects, we used fresh leaves of Erythroxylum pulchrum and manipulated the presence of shrimp and insects by electric exclusion at high and low intensities of electric field. In the control treatment (no electric exclusion) shrimp (the brushing collector Potimirim brasiliana and the shredding omnivore Macrobrachium olfersii) and aquatic insects (including shredders) were present. The low-intensity electric field excluded only shrimp, whereas the high-intensity electric field excluded both shrimp and medium- and large-sized aquatic insects (>2mm). Leaf processing was approximately twice as fast in the absence of shrimp and in the presence of insects than when both or neither were present. This implied a trophic cascade of shrimp acting as potential predators of insect shredders, but not acting as shredders themselves. We postulate that increased leaf processing was caused by a behavioural response of the putative shredders to the absence of shrimp; abundant leptophlebiid ephemeropterans were the most likely shredders.

Dynamics of laser-pumped Nd3+ laser media at high excitation density

1991 ◽  
Vol 48-49 ◽  
pp. 857-862 ◽  
Author(s):  
J.H. Schloss ◽  
L.L. Chase ◽  
L.K. Smith
Keyword(s):  
Excitation Density ◽  
High Excitation ◽  
Laser Media
Sign in / Sign up

Export Citation Format

Share Document