OPTICAL MEDIUM BASED ON CADMIUM-CAESIUM HALIDE CRYSTAL CsCdBr, CONTAINING IMPURITY OF UNIVALENT BISMUTH IONS CAPABLE OF BROADBAND PHOTOLUMINESCENCE IN NEAR INFRARED RANGE, AND PRODUCTION METHOD THEREOF (VERSIONS) Russian patent published in 2016 - IPC C30B11/04 C30B29/12 C09K11/54 C09K11/61 H01S3/16 

FIELD: chemistry.

SUBSTANCE: invention relates to optical media based on crystalline halides and can be used in optical communication systems as broadband amplifiers and lasers. Optical medium contains low-valent bismuth ions as only optically active centre, is capable of broadband luminescence in near infrared range, is a crystalline phase of caesiu-cadmium bromide CsCdBr₃, containing an isomorphic admixture of univalent bismuth ions Bi⁺ in amount of 0.1 atm% to 3 atm%, and luminesces in range of 900-1,200 nm when excited with radiation with wavelength in range of 570-700 nm. Disclosed are two versions of a method of producing an optical medium. First version involves preparation of charge by mixing CsBr, CdBr₂ and BiBr₃ or CsCdBr₃, CdBr₂ and BiBr₃, adding to charge bismuth metal, heating obtained mixture placed in a quartz container, in a vacuum to temperature of 450-500 °C until complete melting, slow cooling of melt to spontaneous crystallisation and separation of monocrystals from produced polycrystalline structure. Second version involves preparation of charge by mixing CsBr, CdBr₂ and BiBr₃ or CsCdBr₃, CdBr₂ and BiBr₃, adding to charge bismuth metal, placing mixture in a quartz container in a vertical Bridgman-Stockbarger furnace until formation of a monocrystalline sample of optical medium. Disclosed optical medium is not hygroscopic, possesses stable luminescence in near infrared range, specifically in range of 900-1,200 nm when excited with radiation with wavelength in range of 570-700 nm.

EFFECT: method of producing bromide CsCdBr₃ is quite simple technologically and enables to grow quality crystals of required dimensions.

4 cl, 2 dwg, 4 ex