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AssigneeNational Institute of Advanced Industrial Science and Technology
InventorsChaonan Xu, Keiko Nishikubo, Shuxiu Zhang, Michio Obata, Hiroaki Tanno
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A method for preparing fine particles of a high brightness luminescent material improved in crystallinity; and a high brightness luminescent material prepared by the method. In an embodiment, BaMgAl10O17:Eu (BAM) as a high brightness luminescent material is prepared by a method which comprises providing an aqueous solution containing an aluminum alcoholate and water-soluble compounds of barium, magnesium and europium, adding an acid to the aqueous solution to form an acidic solution, heating the acidic solution to ca.900° C. and conducting a calcination at the temperature for a short time, and subsequently, firing the calcined product at a temperature higher than that for the calcination, for example, 1400° C. or higher. The method allows the preparation of BAM which comprises spherical fine particles having a pure phase and being improved in crystallinity, and thus is reduced in the deterioration by heat or VUV.
A method for producing a high brightness luminescent material which includes a matrix substance that contains aluminate and a luminescent center, which is a rare earth metal ion and/or transition metal ion, comprising:
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