Abstract. In this work, the influence of the ratio of stabilisers oleylamine and oleic acid on the optical and structural properties of perovskite KPbBr₃ has been studied. The luminescence, infrared spectroscopy and light absorption spectra of the samples synthesised at different stabiliser ratios have been analysed. It was found that the optimal ratio 0.6 mL of oleylamine and 0.4 mL of oleic acid provides maximum luminescence intensity λmax = 395 nm, high UV light absorption peak at 305 nm and stable crystal structure. Increasing the proportion of oleic acid shifts the luminescence peak to 415 nm and decreases its intensity, which is associated with a change in the energy state of the nanoparticle surface. The results confirm the promising use of KPbBr₃ perovskite in optoelectronic devices such as solar cells and LEDs, and highlight the importance of optimising the synthesis conditions to achieve improved material performance.