METHOD FOR PRODUCING A LASER-CONTROLLED LUMINESCENT MEDIUM Russian patent published in 2022 - IPC C09K11/54 B82Y40/00 B82B1/00 C01G5/00 B01J13/00 

FIELD: lasers.

SUBSTANCE: invention relates to laser optics and photonics, and can be used in the manufacture of detectors, mirror and non-linear optical elements, diffraction gratings, and light filters. To prepare a colloidal solution of CdTe quantum dots, first a Cd precursor is produced by combining an 0.040 M aqueous solution of CdBr₂ and an 0.270 M aqueous solution of 3-MPA at the 2.5:1 volume ratio thereof while constantly stirring, followed by bringing the pH level to 10 by drip titration of the 1 M solution of NaOH. A Te precursor is prepared separately by combining an 0.033 M aqueous solution of TeO₂ with an 0.360 M aqueous solution of NaBH₄ at the 1:1 volume ratio thereof. The resulting precursor solutions are combined while constantly stirring for at least 15 minutes at room temperature. The stirring at these stages is performed at a speed of 200 to 500 rpm. The mixture is centrifuged and resuspended in a volume of distilled water equal to the initial volume of the CdTe QD solution. The colloidal solution of Ag nanoparticles in the form of nanoprisms (NP) is synthesised by combining an 0.0125 M aqueous solution of Na₃C₆H₅O₇ with an 0.000376 M solution of AgNO₃ in distilled water, adding 30% H₂O₂ and further adding an 0.001 M solution of KBr and an 0.005 M solution of NaBH₄ at a volume ratio of the solutions of Na₃C₆H₅O₇:AgNO₃:H₂O:H₂O₂:KBr:NaBH₄ equal to 1:2.5:2.5:0.0125:0.0075:1.25, respectively. The mixture is then centrifuged and resuspended in a volume of distilled water equal to the initial volume of the resulting Ag NP solution. The centrifugation at these stages is performed at a speed of at least 5,000 rpm for at least 15 minutes. The colloidal solutions of CdTe QD with an average size of 2.7 nm and Ag NP with all faces equal to 40 nm are combined, resulting in a mixture.

EFFECT: range of available luminescent media for detecting laser radiation is expanded.

1 cl, 3 dwg, 2 ex