METHOD OF CONTROLLING PHASE COMPOSITION OF INORGANIC HALIDE PEROVSKITES AND THERMALLY CONTROLLED LIGHT SOURCE OBTAINED USING SAID METHOD Russian patent published in 2024 - IPC G01N21/00 H01S5/00 

FIELD: semiconductor optoelectronics.

SUBSTANCE: method of controlling the phase composition of inorganic halide perovskites is as follows: a thermoplasmonic metasurface is taken, which is a silicon substrate with plasmon nanostructures of titanium nitride TiN. A microcrystal of inorganic halide perovskite CsPbX_3, where X – Cl, Br, I, is placed on a thermoplasmonic metasurface, wherein linear dimensions of microcrystal are selected from range from 100 nm to 10 mcm. Microcrystalis exposed to continuous laser radiation with power variation. Temperature distribution arises inside the perovskite microcrystal, which controls its phase composition. Microcrystal Raman scattering spectra are measured at each laser radiation power value, from which the microcrystal heating temperature is determined, and plotting the intensity of the Raman scattering lines of the perovskite on temperature. Phase transition temperatures are determined from the appearance of local maxima on the graphs.

EFFECT: possibility of reversible control of phase composition of inorganic halide perovskites, as well as control of wavelength and intensity of photoluminescence of inorganic halide perovskites in a wide range.

2 cl, 5 dwg