Luminescent material for luminescence conversion LEDs comprises alkaline earth sulfide doped with bismuth alone or in combination with sodium

摘要

A luminescent material comprises an alkaline earth sulfide doped with bismuth alone or in combination with sodium of the formula: EA1-xS: (Na, Bi)x, where EA = Sr, Ca, Mg or Ba; and x = 0.005-0.03. An independent claim is also included for an illuminating unit containing an LED.