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Proceedings Paper

Advances In Ac-Electroluminescent Powder Layers
Author(s): A. G. Fischer; K. Koger; D. Herbst; J. Knufer
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Paper Abstract

Abstract: New preparational remedies have been found against the deterioration of ac-field-excited, resin-embedded ZnS-type electroluminescent powder layers (abbreviated EL) during operation. So far, we have been able to prepare such displays already with high visual contrast in bright ambient, with an operating voltage of only 50 V (transistor-compatible) supplied by inexpensive new oscillators, and with white emission of any desired color temperature. Now with prolonged life, the whole range of display applications, from numeric indicators up to flat TV panels, becomes accessible. For these aging studies, the author's model of EL light generation of 1963 was the starting point, leading to such improvements as aluminum coactivation plus halogen particle-growth promotion, high-pressure sulfurization to reduce copper diffusion, and surface passivation by forming inert skins around each particle to prevent surface electrolysis. These methods will help to break Lehmann's monopoly on long-life phosphors and will also provide the elusive long-life blue-emitting EL powders needed for flat TV panels.

Paper Details

Date Published: 10 April 1977
PDF: 7 pages
Proc. SPIE 0099, 3rd European Electro-Optics Conf, (10 April 1977); doi: 10.1117/12.955329
Show Author Affiliations
A. G. Fischer, University of Dortmund (West Germany)
K. Koger, University of Dortmund (West Germany)
D. Herbst, University of Dortmund (West Germany)
J. Knufer, University of Dortmund (West Germany)


Published in SPIE Proceedings Vol. 0099:
3rd European Electro-Optics Conf
Herbert A. Elion, Editor(s)

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