We experimentally investigated photoluminescence, photocurrent relaxation, and the lux-ampere characteristic of photoconductivity in FeGaInS4 single crystals upon second-harmonic excitation by a pulsed YAG:Nd3+ laser. It is shown that the photoluminescence band can be associated with the recombination of bands on impurity or the recombination of donor-acceptor pairs. The decrease in the lifetime upon excitation is due to the high concentration of nonequilibrium carriers generated by high-power laser radiation. An explanation of the lux-ampere characteristic of photoconductivity is given.
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