METHOD FOR OBTAINING A LUMINESCENT MATERIAL AND CONTROLLING THE CHROMATICITY OF ITS GLOW Russian patent published in 2022 - IPC C09K11/78 

FIELD: LED technology.

SUBSTANCE: invention relates to a technology for producing new phosphors based on inorganic crystalline compounds, namely, a method for producing a luminescent material and controlling the chromaticity of its glow based on barium borate and lutetium doped with Eu³⁺ ions. According to the method, the oxides of lutetium and europium, barium carbonate and boric acid are mixed in the necessary stoichiometric ratios, heated at a temperature of 500-600°C for 25 hours, then crushed, mixed and tableted, after which they are heated at 880°C for 25 hours with intermediate grinding, mixing and tableting, then heated at 900°C for 25 hours, then the tablets are again ground, chafed and pressed again, after which they are heated at a temperature of 910°C and kept for 25 hours, resulting in polycrystalline material. In this case, the control of the chromaticity coordinates of its glow in the range from (0.23559; 0.07677) to (0.58265; 0.3777) is carried out by setting the concentration of europium ions in borate Ba₃(Lu_1-xEu_x)₂(B₂O₅)₃, where x is the proportion of Eu³⁺ ions in the range x = 0.01 – 0.375.

EFFECT: invention makes it possible to obtain a luminescent material with controlled luminescence chromaticity under optical excitation in the near ultraviolet (UV-C LED), which can be used in LEDs.

1 cl, 2 dwg