In this work, we first report a fabrication approach for CsPb(1-x)MnxCl(3) perovskite film to address stability issues and for application in an optoelectronic device. The CsPb0.77Mn0.23Cl3 perovskite film is applied to a UV LED chip and the conversion efficiency is shown to be 16.2 lm/W at less than 20 mA. The CsPb0.77Mn0.23Cl3 perovskite film could be utilized as a new application for white LEDs, expanding the range of optical properties of LEDs, which could then be produced with reduced lead content.