METHOD OF PRODUCING NANOPOWDER OF RED PHOTOLUMINOPHOR WITH PROLONGED AFTERGLOW Russian patent published in 2024 - IPC C09K11/57 C09K11/68 C09K11/78 C09K11/80 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering and can be used in medicine for photodynamic therapy (PDT) of internal organs. Initial components Al(NO₃)₃, Ga(NO₃)₃, La(NO₃), Mn(NO₃)₂, sodium tungstate Na₂WO₄, as well as Na₃C₆H₅O₇ are dissolved in water. Mixed solution is placed for 1 hour in an ultrasonic bath with power of 100 W with frequency of 44 kHz at temperature of 60 °C. Formed precipitate is separated, washed and dried in air at 90 °C for 12 hours. Then high-temperature annealing of the dried precipitate is carried out at temperature of 700 °C for one hour under argon pressure of 1.5⋅10⁷ Pa to improve crystallinity and prevent particle growth. Nanopowder of red photoluminophor with prolonged afterglow is obtained, having chemical formula La_1-x-y-zAl_xGa_yWO₆:Mn_z, where concentration of ions of aluminium Al⁺³ and gallium Ga⁺³ is 10 at.% and 6 at.% respectively, and concentration of ion-activator – Mn⁺⁴ is 2 at.%. Peak of the luminescence wavelength of the luminophor is in the red region of the spectrum and is equal to 668 nm.

EFFECT: particle size of the obtained powder is not more than 50 nm, which enables to obtain a colloidal solution suitable for introduction into a patient's body.

1 cl, 4 dwg