Thumbnail
Access Restriction
Open

Author Bachir, S. ♦ Kossanyi, J. ♦ Sandouly, C. ♦ Valat, P. ♦ Ronfard-Haret, J. C.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CHEMISTRY ♦ DOPED MATERIALS ♦ ELECTROLUMINESCENCE ♦ ZINC OXIDES ♦ SEMICONDUCTOR MATERIALS ♦ SAMARIUM IONS ♦ DYSPROSIUM IONS ♦ POLYCRYSTALS ♦ EMISSION SPECTRA
Abstract The electroluminescence of Dy{sup 3+} and Sm{sup 3+} ions inserted in polycrystalline semiconducting zinc oxide was studied using a rare earth-doped sintered zinc oxide disc sandwiched between two metallic solders. This device, which corresponds to a metal-semiconductor-metal (MSM) structure, is similar to a varistor and is able to operate under either ac or dc mode. The excitation of the trivalent rare earth ions is a consequence of a hot electron impact process. The rare earth ions are located near the grain boundaries. Their luminescence acts as a probe and evidences hot electrons near the grain boundaries where, in accordance with the model of varistors, they are produced by thermionic emission. 30 refs., 7 figs., 1 tab.
ISSN 00223654
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-04-13
Publisher Place United States
Journal Journal of Physical Chemistry
Volume Number 99
Issue Number 15


Open content in new tab

   Open content in new tab