Abstract
The degradation mechanism of SrS:Ce electroluminescent (EL) devices is proposed. Degradation is induced by the Sr 2+ vacancies in a SrS phosphor film. The Sr 2+ vacancies are formed by Ce doping and S excess deposition condition. Ce has a special influence on Sr 2+ vacancy formation in comparison with other trivalent rare-earth ions because of the partial existence of Ce 4+. We have found that phosphorus codoping, which quenches the Sr 2+ vacancies, drastically improves the stability of SrS:Ce EL devices.
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