Abstract
At present, thick film (powder based) alternating current electroluminescence (AC-EL) is the only technology available for the fabrication of large area, laterally structured and coloured light sources by simple printing techniques. Substrates for printing may be based on flexible polymers or glass, so the final devices can take up a huge variety of shapes. After an introduction of the underlying physics and chemistry, the review highlights the technical progress behind this development, concentrating on luminescent and dielectric materials used. Limitations of the available materials as well as room for further improvement are also discussed.
Highlights
Alternating current electroluminescence (AC-EL) in ZnS powder layers was discovered as early as 1936 by George Destriau [1] when working on the conductivity of certain metal alloys in the laboratory of Marie Curie in Paris
He immediately recognized their potential as a convenient light source and later developed the effect to application in AC-electroluminescent foils
There have been attempts to coat the phosphor particles with the preferred dielectric (BaTiO3 ) in order to prevent any loss of field strength and enhance luminous output [55], but the sol-gel method employed did not produce dense, reliable coatings, whereas BaTiO3 is difficult to deposit by Chemical Vapour Deposition (CVD) methods
Summary
Alternating current electroluminescence (AC-EL) in ZnS powder layers was discovered as early as 1936 by George Destriau [1] when working on the conductivity of certain metal alloys in the laboratory of Marie Curie in Paris.
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