RED NARROWBAND LIGHT EMITTING COATED FLUOROSILICATES FOR SEMICONDUCTOR LIGHT EMITTING DEVICES Russian patent published in 2017 - IPC C09K11/02 C09K11/61 H01L33/50 H05B33/14 

FIELD: chemistry.

SUBSTANCE: lighting device includes a light source configured to generate light source light, and luminescent material in particulate form, adapted to convert at least a portion of the light source light into luminescent material light. The light source comprises a light emitting diode (LED). The luminescent material in particulate form comprises particles with cores. These cores include phosphor containing M'_xM_2-2xAX₆ doped with tetravalent manganese, where M' is alkaline earth cation, M is alkali cation, x - 0-1, A is tetravalent cation containing at least silicon, X is monovalent anion containing at least fluorine. The particles further comprise a metal phosphate coating, where the metal is selected from the group consisting of Ti, Si and Al. A method for luminescent material obtaining is described.

EFFECT: luminescent material provides improved long-term stability in water and moist air at effective absorption in the blue region and absorbed light transformartion into red.

15 cl, 7 dwg, 1 tbl, 1 ex