This study reports the successful synthesis of 6 nm-sized CH₃NH₃PbBr₃ perovskite nanoparticles using a simple and fast method. The nanoparticles are stabilized by medium-sized chain ammonium bromide, allowing them to remain dispersed in various organic solvents for over three months. These nanoparticles can be used to prepare homogeneous thin films by spin-coating on quartz substrates, which exhibit high quantum yields (around 20%) and emit light within a narrow bandwidth of the visible spectrum. The stability and optical properties of these nanoparticles make them promising for optoelectronic applications, such as solar cells. The study also explores the use of shorter alkyl chains to enhance the homogeneity and stability of the nanoparticles, with the best results obtained using octylammonium bromide. The findings demonstrate the potential of these nanoparticles in advanced optoelectronic devices.This study reports the successful synthesis of 6 nm-sized CH₃NH₃PbBr₃ perovskite nanoparticles using a simple and fast method. The nanoparticles are stabilized by medium-sized chain ammonium bromide, allowing them to remain dispersed in various organic solvents for over three months. These nanoparticles can be used to prepare homogeneous thin films by spin-coating on quartz substrates, which exhibit high quantum yields (around 20%) and emit light within a narrow bandwidth of the visible spectrum. The stability and optical properties of these nanoparticles make them promising for optoelectronic applications, such as solar cells. The study also explores the use of shorter alkyl chains to enhance the homogeneity and stability of the nanoparticles, with the best results obtained using octylammonium bromide. The findings demonstrate the potential of these nanoparticles in advanced optoelectronic devices.