Carrier Mobility Measurement

Yoshino, Katsumi

doi:10.1109/tei.1986.349014

Cited by 14 publications

(3 citation statements)

References 28 publications

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“…Two other approaches focusing on investigations of charge carrier migration and recombination should be mentioned here. One is based on measurements of the luminescence that appears upon ion recombination. − Another utilizes the detection of radiation-induced conductivity of polymers, ,,, in particular by using time-of-flight measurements, which allow determining the sign of charge carriers as well as their mobility. Typically, these approaches are used to provide data on the energy of charge carriers trapped in polymers, but it is difficult to use these data to identify the charge carriers that contribute to the detected signals.…”

Section: Introductionmentioning

confidence: 99%

Radiation-Induced Fluorescence from Doped Polyolefins on a Nanosecond Time Scale: Kinetics of the Processes Involving Geminate Radical Ions

2019

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The delayed radiation-induced fluorescence from polyethylene and its alkyl-and fluorine-substituted analogues doped with aromatic luminophores was studied in the time range of 1−1000 ns. Qualitative analysis of the effects of a magnetic field on the fluorescence decay indicated that, in all polyolefins studied, the main portion of the fluorescence observed arose from the recombination of geminate spincorrelated radical ion pairs (RIPs). In the case of polyethylene, this conclusion was supported by observing the effect of an external electric field on the fluorescence decay. It was shown by comparison with the computer simulation of intratrack recombination that the tunneling character of the RIP recombination, which had an asymptotic time dependence of the geminate recombination rate close to t −1 , was typical of most studied polyolefins at temperatures below 273 K in the time range studied. The increase to room temperature and above caused a gradual transition to a regime where the geminate recombination rate was mainly determined by the migration of RIP partners with time dependence close to t −3/2 . The low estimate of the electron transfer distance upon the ion recombination in this regime was about 2 nm. In polyethylenes, exposed to an irradiation of 0.3−0.4 MGy, the role of charge carrier diffusion became hardly noticeable because of the cross-linking of polyethylene chains and the increase in polymer matrix stiffness. Oxygen, dissolved in a polymer doped with aromatic molecules, caused quenching of the recombination luminescence due to electron transfer from the dopant radical anion to the oxygen molecules. At room temperature, typical distances for such electron transfer were estimated to be ∼1.5 nm.

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Section: Introductionmentioning

confidence: 99%

Radiation-Induced Fluorescence from Doped Polyolefins on a Nanosecond Time Scale: Kinetics of the Processes Involving Geminate Radical Ions

2019

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“…21 On the other hand, in the early stage (1970)(1971)(1972)(1973)(1974)(1975)(1976)(1977)(1978)(1979)(1980) of the study on the electrical properties of liquid crystals only the migration of ionic carriers were reported but not electronic carrier species. [3][4][5] That is, the carrier mobility in liquid crystals is confirmed to be related with viscosity by Walden's rule. [3,4] Though in some smectic liquid crystals relatively high carrier mobility was found and it was confirmed to be higher at lower temperature smecticphases, it was still interpreted in terms of ionic carriers.…”

Section: Introductionmentioning

confidence: 99%

“…[3,4] Though in some smectic liquid crystals relatively high carrier mobility was found and it was confirmed to be higher at lower temperature smecticphases, it was still interpreted in terms of ionic carriers. [5] Recently, however, relatively high hole mobility was found in discotic liquid crystals which are composed of disc-shaped molecules. [6][7][8][9][10] This finding in fluid is highly exciting for the researchers in the field of dielectric liquids, because contrary to the electron migration in dielectric liquids the report on the hole migration in dielectric liquids has been highly limited.…”

Section: Introductionmentioning

confidence: 99%

Discotic liquid crystals as new class of fluid and their electrical and optical properties

Ohta

Ban²,

Nishizawa³

et al.

Proceedings of 1999 IEEE 13th International Conference on Dielectric Liquids (ICDL'99) (Cat. No.99CH36213)

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Unique shctural, electrical and optical properties of discotic liquid crystals composed of disc-shaped molecules are discussed in comparison with those of calamitic liquid crystals composed of rod-like molecules, dielectric liquids and crystals.Electronic carrier is confirmed to contribute dominantly in fast photoconductivity in discotic liquid crystals. Hole mobility in discotic phases has been found to be much larger compared with ionic mobility and to be dependent on the molecular structure, phases and disorders. Photo-carrier generation process in discotic liquids is also studied and discussed in terms of Onsager model.

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Dipole reorientation in polymeric layers investigated by photo-induced current

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Carrier Mobility Measurement

Cited by 14 publications

References 28 publications

Radiation-Induced Fluorescence from Doped Polyolefins on a Nanosecond Time Scale: Kinetics of the Processes Involving Geminate Radical Ions

Radiation-Induced Fluorescence from Doped Polyolefins on a Nanosecond Time Scale: Kinetics of the Processes Involving Geminate Radical Ions

Discotic liquid crystals as new class of fluid and their electrical and optical properties

Dipole reorientation in polymeric layers investigated by photo-induced current

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