PROCESS FOR THE PREPARATION OF AN YTTRIUM AND RARE EARTH MIXED OXIDE

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The invention concerns a process for the preparation of an yttrium and at least one rare earth mixed oxide which comprises the following steps : (a) mixing a precursor of the yttrium and at least one rare earth mixed oxide with a flux comprising a barium halide and a boron compound; (b) calcining the mixture of step (a) to obtain said mixed oxide. This mixed oxide may be used as a phosphor in the manufacture of coloured fluorescent lamps, cathode ray tubes (CRT) and plasma display panels (PDP).