Abstract
Electroluminescence from cermet films was studied in the high field prebreakdown regime. The samples consisted of three evaporated layers: a transparent indium tin oxide electrode on glass, a cermet film of CoAl 2O 3 or AuAl 2O 3 and a small top electrode of gold or aluminium. Electron microscopy showed that the cermet layers are composed of metal particles in an amorphous matrix; for CoAl 2O 3 some metal was also dispersed as ions in the matrix. After the application of a sufficiently high d.c. voltage of arbitrary polarity between the electrodes, we recorded electroluminescence spectra in the wavelength interval 350–920 nm. Broad spectral peaks were found; they were different for the two cermet materials. An increase in the voltage can enhance the light intensity by orders of magnitude, while the spectral features remain almost unchanged. A detailed interpretation of the effect is not yet available.
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