PRECURSOR COMPOUND AND CRYSTALLISED COMPOUND OF THE ALKALINE-EARTH ALUMINATE TYPE, AND METHODS OF P

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The invention relates to an alkaline-earth-aluminate-type compound which is at least partially crystallised such as in the form of a beta- or tridymite-type alumina and which comprises a composition having formula a(M1O).b(MgO).c(Al2O3), in which M1 denotes at least one alkaline-earth and a, b and c are integer or non-integer numbers whereby 0.25 = a = 4, O = b = 2 and 0.5 = c = 9, M1 being partially substituted by europium and at least one other element belonging to the group of rare earths having an ionic radius of less than that of Eu3+. In addition, the compound takes the form of substantially-whole particles with a maximum average size of 6 ?m. Said compound can be used as phosphor in plasma-type screens or in trichromatic lamps, backlights for liquid crystal displays or plasma excitation lighting or in light-emitting diodes. The invention also relates to a precursor compound of the aforementioned compound.