RED EMITTING LUMINESCENT MATERIALS Russian patent published in 2012 - IPC C09K11/78 C09K11/79 C09K11/80 H05B33/14 

FIELD: chemistry.

SUBSTANCE: red light emitting material has the formula M_1-yA_1+xS_4-xN_7-x-2yO_x+2y:RE, where M is selected from a group comprising Ba, Sr, Ca, Mg or mixtures thereof, A is selected from a group comprising Al, Ga, B or mixtures thereof, RE is selected from a group comprising rare-earth metals: Y, La, Sc, Eu, Ce or mixtures thereof, x≥0 and ≤1, y≥0 and ≤0.2. Doping level ≥0.5% and ≤10%; photostability ≥80% and ≤90%. A light-emitting device contains said luminescent material in form of powder or ceramic material. The powder has d₅₀≥5 and ≤15 mcm. The ceramic material has ≥90% of theoretical density.

EFFECT: luminescent material has high quantum efficiency, luminous efficacy and colour rendition.

10 cl, 6 dwg, 4 tbl, 2 ex