Spatial Distribution of Charge Carrier Density in a Low Temperature Gas Discharge Plasma

1973 ◽  
Vol 51 (13) ◽  
pp. 1438-1442
Author(s):  
S. B. Joshi ◽  
V. T. Chiplonkar
Keyword(s):  
Spatial Distribution ◽  
Low Temperature ◽  
Charge Carrier ◽  
Carrier Density ◽  
Discharge Plasma ◽  
Gas Discharge ◽  
Probe Measurement ◽  
Charge Carrier Density ◽  
Double Probe ◽  
Gas Discharge Plasma

The spatial distribution of the charge carrier density in aglow discharge plasma of air and argon has been obtained by a double probe measurement and is shown to conform with the theoretical expectations, with appropriate modifications.

Study on Organic Triplet Exciton Emission and Quenching Processes by Low-temperature Photo- and Electroluminescence Spectroscopy

2008 ◽  
Vol 1115 ◽  
Author(s):  
Nils Asmus Kristian Kaufmann ◽  
Frank Jessen ◽  
M. Heuken ◽  
Herbert Boerner ◽  
Holger Kalisch ◽  
...  
Keyword(s):  
Low Temperature ◽  
Charge Carrier ◽  
Carrier Density ◽  
Organic Materials ◽  
Energy Levels ◽  
Triplet Exciton ◽  
Light Sources ◽  
Charge Carrier Density ◽  
Electrical Excitation

AbstractOrganic light emitting diodes (OLED) are efficient light sources based on organic semiconductors. Unlike inorganic LEDs which are more or less point sources, OLED are planar light sources with up to 1 m2 in area. By using organic materials, they are cheap to produce and economical to use. The determination of triplet exciton energy levels is of interest for the development of efficient OLED, based on the fact that electrical excitation usually creates three times as many triplets as singlets. Additionally, the knowledge of these energy levels is crucial for the design and choice of emitter matrix materials and exciton blocking layers. These values are normally determined by photoluminescence (PL) measurements in solution for materials which show intersystem crossing (ISC) between singlet and triplet states. For some materials, the triplet levels cannot be measured this way because some materials prohibit ISC. In this work, a method is presented which allows the determination of the energy levels using low-temperature electroluminescence (EL) spectroscopy. The dependence on ISC is avoided by creating triplets directly with electrical excitation and this allows to measure a large class of organic materials. A low-temperature EL spectrum is presented for N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD) in a 3-phenyl-4-(1‘-naphthyl)-5-phenyl-1,2,4-triazole (TAZ) matrix (TPD/TAZ 1:3) at 77 K. Triplet emission is only observed at very low charge carrier density (0.5 μA/mm2). Quenching processes are analyzed using combined EL and PL measurements and unipolar devices. Two factors can be the cause of the quenching: A strong quenching based on a low concentration of electrically activated impurities could explain the dependency. The other explanation points to a quenching based on electrons in the emitting layer. This might be explained with triplet-polaron quenching (TPQ). TPQ is proportional to the charge carrier density and contributes the dominant part to the quenching at low current densities.

Generation of low-temperature gas discharge plasma in large vacuum volumes for plasma chemical processes

2015 ◽  
Vol 85 (5) ◽  
pp. 1326-1338 ◽  
Author(s):  
N. N. Koval ◽  
Yu. F. Ivanov ◽  
I. V. Lopatin ◽  
Yu. H. Akhmadeev ◽  
V. V. Shugurov ◽  
...  
Keyword(s):  
Low Temperature ◽  
Discharge Plasma ◽  
Gas Discharge ◽  
Chemical Processes ◽  
Plasma Chemical ◽  
Gas Discharge Plasma

scholarly journals Reactor graphite processing in low-temperature gas-discharge plasma

2019 ◽  
Vol 1370 ◽  
pp. 012028
Author(s):  
M R Shavaleev ◽  
N M Barbin ◽  
D I Terentyev ◽  
M P Dal’kov ◽  
S G Alexeev
Keyword(s):  
Low Temperature ◽  
Discharge Plasma ◽  
Gas Discharge ◽  
Gas Discharge Plasma ◽  
Reactor Graphite
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