Abstract
AC powder electroluminescent lamps have been known and used for many years, but their mechanism of operation is still debated. Many thousands of phosphors are known, but the vast majority are not electroluminescent. A number of materials do exhibit the effect. Of these, however, ZnS doped with Cu is absolutely in a class of its own, and is the only material from which viable lamps can be made. In this work studies have been made of the performance of devices under a range of pulsed and continuous excitation conditions and new hypotheses presented which attempt to explain the behavior of this unique material.
Highlights
The phenomenon of electroluminescence was first discovered by Round in 1907 [1] while working on silicon carbide
The ACELs used in this work were made at Brunel University London using phosphor powders supplied by GTP Osram-Sylvania
Consideration of the method of manufacture and the effect of doping of ZnS:Cu electroluminescent phosphors suggests that the most likely initiation sites are copper segregated into dislocations/grain boundaries rather than as precipitates as suggested by Fischer
Summary
The phenomenon of electroluminescence was first discovered by Round in 1907 [1] while working on silicon carbide. Since the days of Destriau in the 1930s, various materials have been found that exhibit the electroluminescent effect, but none comes close to matching the performance of the copper-doped zinc sulphide that he worked on and even today this unique material is the only phosphor used in commercial devices.
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