YTTRIUM ORTHO-PHOSPHATE-BASED INFRARED LUMINOPHORE AND SYNTHESIS METHOD THEREOF Russian patent published in 2011 - IPC C09K11/77 C09K11/78 

FIELD: chemistry.

SUBSTANCE: invention can be used to produce infrared luminophores, having radiation in the near infrared range (0.80-0.82 and 0.90-0.98 mcm) when excited. The yttrium ortho-phosphate-based infrared luminophore can be used to make hidden, machine-readable luminescent labels used to protect bond payer, as well as active medium for lasers which generate in the (1.5-1.6 mcm) spectral range which is safe for the human eye. The yttrium ortho-phosphate-based infrared luminophore contains only Yb³⁺, Er³⁺, Ce³⁺ ions as optically active ions in a cationic subarray and has chemical composition corresponding to the following empirical formula: Y_1-x-y-zYb_xEr_yCe_zPO₄, where 0.1≤x≤0.88; 0.0001≤y≤0.1; 1*10^-4≤z≤1*10^-2. The luminophore has simultaneously high intensity of Stokes infrared luminescence in the 1.5-1.6 mcm range and minimum anti-Stokes luminescence. The method of producing the infrared luminophore involves thermal treatment of a mixture of oxides of yttrium, ytterbium, erbium and cerium, a phosphorus-containing compound and a mineralising agent in air, wherein the phosphorus-containing compound used is disubstituted ammonium phosphate, and the mineralising agent used is carbonates of alkali metals: Li, Na and K, and thermal treatment is carried out at temperature 900-1250°C, which, depending on the concentration of the mineralising agent and calcination conditions, ensures reproducible production of well-formed microcrystals of the yttriuim ortho-phosphate-based infrared luminophore with average particle size from 2 to 18 mcm.

EFFECT: method is easily producible and high-efficient.

2 cl, 4 dwg, 11 ex