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Author Peter, Manuela ♦ Murayama, Masatoshi ♦ Nishimura, Satoru ♦ Ohmi, Koutoku ♦ Tanaka, Shosaku ♦ Kobayashi, Hiroshi
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword NUCLEAR PHYSICS AND RADIATION PHYSICS ♦ ACTIVATION ENERGY ♦ ANNIHILATION ♦ CRYSTAL FIELD ♦ IONIZATION ♦ PHYSICS ♦ PROBABILITY ♦ QUANTUM EFFICIENCY ♦ SPACE CHARGE ♦ SYMMETRY ♦ TEMPERATURE DEPENDENCE
Abstract Dynamic space charge in SrS:Ce ac thin-film electroluminescent (ACTFEL) devices is not a SrS host property. In SrS:Ce ACTFEL devices, a lack of charge injection from interface states leads to space charge formation and to dynamic space charge formation. The dynamic space charge is formed by the impact ionization of Ce and of Ce induced deep level traps. The crystal field symmetry of the Ce{sup 3+} site determines its ionization probability. Ce{sup 3+} sites of cubic crystal field symmetry have a lower ionization probability than Ce{sup 3+} sites with axial crystal field symmetry. A prerequisite for dynamic space charge, i.e., short lived space charge, is the annihilation of space charge. The charge responsible for space charge annihilation originates from trap levels with an activation energy of about 9 meV. The temperature dependence of the annihilation of the space charge is responsible for the observed temperature dependence of the dynamic space charge formation, the conduction charge, and the quantum efficiency. {copyright} 2001 American Institute of Physics.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-15
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 90
Issue Number 4


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