METHOD FOR SOLID PHASE SYNTHESIS OF WHITE LIGHT PHOSPHOR BASED ON RARE EARTH GARNETS Russian patent published in 2016 - IPC C09K11/78 C09K11/80 

FIELD: lighting.

SUBSTANCE: invention is designed for lighting and may be used in white light-emitting diodes, fluorescent lamps, lamps, automotive lamps and lighting design. Method for synthesis of white light phosphors based on rare-earth garnets (Y_0.98Ce_0.02)₃Al₅O₁₂, (Gd_0.98Ce_0.02)₃Al₅O₁₂, (Lu_0.98Ce_0.02)₃Al₅O₁₂ includes mixing source oxides of metals, taken in proportions stoichiometric compound, and heating resulting mixture. To carry out synthesis at a variable pressure working volume with an initial mixture is first evacuated to a pressure of 10^-2 Pa, and then filled with a mixture gas in a proportion of 95 % N₂ to 5 % H₂ pressure to 101,325 Pa, temperature is raised to a temperature in beginning of formation of the synthesised compound in range of 1,250-1,350 °C, raising pressure of reduced gas to 1.5 x 10⁷ Pa and holding for at least 3 hours. Thereafter, gas is evacuated to a pressure of 10^-2 Pa and held for at least 5 hours. Cooled at a rate of 80-100 °C/h to room temperature and obtained sample is removed.

EFFECT: phosphors have a single phase composition, proper isometric particles do not form agglomerates, with a particle size distribution D50 is 15-20 mcm, luminous efficiency is 120-101 lm/W.

4 cl, 10 dwg, 3 ex