Edge photoluminescence of monocrystals $\beta$-$TL_{1-x}CU_{x}INS_2$ ($0 \leq X \leq 0,015$)

The work presents the results of an experimental study of the edge luminescence of single crystals of $\beta$-$TL_{1-x}CU_{x}INS_2$ ($0 \leq X \leq 0,015$) solid solutions at 300 K grown by the Bridgman-Stockbarger method to reveal the mechanism of radiative recombination. The luminescence was excited by emission from an AM-LDN-FV diode laser with an emission wavelength of $450$ nm at an angle of $45^\circ$. The energy positions of emission maxima, half-widths and intensities of emission bands indicate the interzone nature of radiative recombination. It is shown that in single crystals of $\beta$-$TL_{1-x}CU_{x}INS_2$ solid substitution solutions ($0 \leq X \leq 0,015$), an increase in the concentration of copper atoms leads to a narrowing of the emission band and its shift to the long-wavelength region.