SUB-MICRON RARE EARTH BORATE, A METHOD FOR THE PRODUCTION THEREOF AND THE USE IN THE FORM OF LUMINO

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The inventive rare earth borate is embodied in the form of a liquid phase suspension of substantially monocrystalline particles whose mean size ranges from 100 to 400 nm. Said borate is produced according a method consisting in roasting a rare earth borocarbonate or hydroxyborocarbonate with a temperature which is sufficient for forming a borate and obtaining a product whose specific surface area is equal to or greater than 3 m2/g and in carrying out the humid grinding of the roasted product. The inventive borate can be used in the form of luminophor, in particular, for producing a luminescent transparent material.