OREGON STATE UNIVERSITY

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Luminescent impurity doping trends in alternating-current thin-film electroluminescent phosphors

TitleLuminescent impurity doping trends in alternating-current thin-film electroluminescent phosphors
Publication TypeJournal Article
Year of Publication2002
AuthorsWager, J. F., J. C. Hitt, B. A. Baukol, J. P. Bender, and D. A. Keszler
JournalJournal of Luminescence
Volume97
Issue1
Pagination68 - 81
ISSN00222313
Keywordselectroluminescence, luminescent impurities, SrS:Ce, SrS:Cu, ZnS:Mn
Abstract

The doping properties of three alternating-current thin-film electroluminescent (ACTFEL) phosphor host/luminescent impurity systems, ZnS:Mn, SrS:Ce, and SrS:Cu, are elucidated, and the ACTFEL device implications of these properties are assessed. Mn is isovalent, Ce is a donor, and Cu is an acceptor. Moreover, Ce is readily ionized in SrS, so that it behaves as a double donor. The distinctly different doping nature of these three luminescent impurities leads to dramatically disparate defect and device physics trends. The donor/acceptor nature of Ce/Cu in SrS results in charge neutrality being achieved in SrS:Ce and SrS:Cu via self-compensation-induced vacancy creation; subsequent defect complexing between oppositely charged luminescent impurities and self-compensation-induced vacancies results in more complex ACTFEL device behaviors such as dynamic space charge, trailing-edge emission, charge collapse, color tuning, and electroluminescence (EL) thermal quenching. In contrast, the isovalent nature of ZnS:Mn leads to more ideal ACTFEL device operation. This suggests that the optimal ACTFEL phosphor luminescent impurity is isovalent.

DOI10.1016/S0022-2313(01)00429-X