METHOD FOR SYNTHESIS OF LUMINOPHOR BASED ON NANOTUBULAR HAFNIUM DIOXIDE Russian patent published in 2024 - IPC C09K11/67 B82B3/00 C01G27/02 C25B1/00 B82Y40/00 

FIELD: chemical industry; nanotechnology.

SUBSTANCE: during synthesis of a luminophor based on nanotubular hafnium dioxide, a container is used, filled with an electrolyte consisting of ammonium fluoride, water and ethylene glycol, with electrodes placed in it, one of which is connected to the positive terminal of the power supply, is presented in the form of undoped hafnium foil and is fixed on the thermostatic element to maintain its temperature constant in range of 20–25 °C. Electrode connected to the negative terminal of the power supply is made of stainless steel. Voltage of 16–40 V is applied to electrodes and kept constant during four hours. Brass plate connected to a Peltier element is used as a thermostatic element. After electrolysis, the phosphor is dried and annealed at 300 °C.

EFFECT: high efficiency of the synthesis method owing to improved luminescent properties of the luminophor of the blue emission spectrum and low material consumption of the precious metals used.

3 cl, 6 dwg