<p>In this work, high-brightness perovskite-based LEDs were simulated using the Silvaco-Atlas program, employing a 15 nm CH₃NH₃PbI_3−xCl_x emissive layer sandwiched between TiO₂ and F8 to ensure efficient carrier confinement and enhanced radiative recombination. By systematically varying the halide composition (x), the bandgap was tuned from 1.67 to 2.78 eV, corresponding to emission wavelengths ranging from 738 to 445 nm. The simulation results revealed that the narrowest emission profile, with a FWHM of 2.85 nm, was achieved at the highest Cl concentration (x = 0.8), while the maximum power spectral density (PSD) was obtained under a 10 V bias. These findings confirm the effectiveness of composition engineering in perovskite emitters for achieving cost-effective, spectrally tunable, and high-performance light-emitting devices.</p> Graphical abstract <p></p>