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1. (WO2018182461) METHOD FOR OBTAINING LUMINESCENT MATERIAL HAVING YELLOW-COLOURED AND GREEN-COLOURED LUMINESCENCE TO CREATE A RESULTANT WHITE LIGHT IN LIGHT-EMITTING DIODES

Pub. No.:    WO/2018/182461    International Application No.:    PCT/RU2018/050033
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 23 00:59:59 CET 2018
IPC: C09K 11/78
C09K 11/80
F21S 13/00
F21Y 115/10
Applicants: OBSHCHESTVO S OGRANICHENNOJ OTVETSTVENNOSTYU "MONOCRYSTAL PASTY"
ОБЩЕСТВО С ОГРАНИЧЕННОЙ ОТВЕТСТВЕННОСТЬЮ "МОНОКРИСТАЛЛ ПАСТЫ"
Inventors: KICHUK, Stanislav Nikolaevich
КИЧУК, Станислав Николаевич
MIKHITARYAN, Boris Valerevich
МИХИТАРЬЯН, Борис Валерьевич
Title: METHOD FOR OBTAINING LUMINESCENT MATERIAL HAVING YELLOW-COLOURED AND GREEN-COLOURED LUMINESCENCE TO CREATE A RESULTANT WHITE LIGHT IN LIGHT-EMITTING DIODES
Abstract:
The invention can be used in light-emitting diodes. Hydroxides of yttrium, cerium, gallium and aluminum are mixed. The mixture obtained is ground. Annealing is then carried out at 600-800 °С for 3-4 hours. Barium fluoride, pre-ground to an average diameter of 5 μm, and ammonium chloride in a quantity of 4-5% of the total mass of the oxides are then added to the mixture of oxides obtained. The mixture is milled in a rolling mill for 12 hours and calcined in a forming gas medium at 1500-1600 °С. Calcination is performed for 4-8 hours to obtain a luminophore having an average particle size of 4-8 μm. Calcination is performed for 8-12 hours to obtain a luminophore with an average particle size of 14-17 μm. A finely dispersed luminescent material having yellow-coloured and green-coloured luminescence is obtained to create a resultant white light in light-emitting diodes. The technical result is reduced duration of the process, increased crystallinity and tapped density of the luminophore obtained and, as a result, increased brightness of the luminescence.