METHOD OF PRODUCING DIAMOND LIGHT-EMITTING NANOPARTICLES Russian patent published in 2012 - IPC C01B31/06 B82B3/00 B82Y5/00 B82Y20/00 B82Y40/00 

FIELD: process engineering.

SUBSTANCE: invention may be used in light emitters for quantum cryptography systems and in biomarkers. Diamonds with centers nitrogen-vacancy are produced from diamonds of size exceeding 0.1 mcm grown at pressure and temperature and including isolated substituting atoms of nitrogen by irradiating them with electron beam at radiation dose of 10¹⁷ to 10¹⁸ electron/cm² and power exceeding 7 MeV. In irradiation, diamond temperature does not exceed 80 °C due circulating coolant, mainly, water. Irradiated diamond are annealed in vacuum or inert atmosphere at over 700 °C for, at least, 1 hour. After annealing, diamonds are ground to nanoparticles sized to less than 20 nm. Produced diamonds contain 4-16 centers nitrogen-vacancy in 20 nm-particle, or 10 said centers in 10 nm-particle, or 8 centers in 15 nm-particle. High density of nitrogen-vacancies ensured high luminescence properties.

EFFECT: higher efficiency, power savings.

13 cl, 7 dwg