A thin film phosphor for an electroluminescent device, the phosphor being a compound of the formula Mg.sub.x Ca.sub.1-x Al.sub.2 S.sub.4 :M, where the value of x is in the range 0 Un phosphore de la couche mince pour un dispositif électro-luminescent, le phosphore étant un composé de la formule Mg.sub.x Ca.sub.1-x Al.sub.2 S.sub.4 :M, où la valeur de x est dans la gamme 0
 
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