| 简介 |
FIELD : chemistry.
SUBSTANCE : invention can be used for making dyes, plastics, resins, glass and ceramic objects, cements, adhesives, fibres, yarn. Aluminate luminophores, which are a matrix based on aluminium oxide and oxides of at least one element chosen from : Mg, Ca, Sr, Ba, Zn, Si, activated by at least one rare-earth element, are treated with aqueous solutions of monosubstituted phosphates at pH 6 at the beginning and pH above 7 at the end of treatment or solutions of agents chosen from : H2SO4, H3PO4, monosubstituted phosphates, mixture of tri- or disubstituted phosphates with at least one acid from : HCl, H2SO4 or HNO3 at pH 1 at the beginning and pH not above 4 a the end of treatment. The oxide matrix can have formula : MO-SiO2-Al2O3 : R, MAl2O4 : R, -MAlO4 : R, Sr4Al14O25 : R, where M - is a metal, chosen from : Ca, Mg, Sr, Ba, Zn; R - at least one rare-earth metal, chosen from a group consisting of Dy, Nd, Eu, Tm, Tb, Y, Yb.
EFFECT : invention increases luminous intensity of aluminate luminophores without reducing hydrolytic stability.
5 cl, 3 tbl, 27 ex |
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