This study presents high brightness light-emitting diodes (PeLEDs) based on solution-processed organometal halide perovskites. The research demonstrates electroluminescence in the near-infrared, green, and red regions by tuning the halide compositions in the perovskite. The infrared PeLED achieves a radiance of 13.2 W sr⁻¹ m⁻² at a current density of 363 mA cm⁻², with external and internal quantum efficiencies of 0.76% and 3.4%, respectively. The green PeLED achieves a luminance of 364 cd m⁻² at a current density of 123 mA cm⁻², with external and internal quantum efficiencies of 0.1% and 0.4%, respectively. The study shows that radiative bimolecular recombination dominates at higher excitation densities, leading to increased quantum efficiencies at higher current densities. The research also demonstrates the potential of these perovskites for efficient and color-tunable light emitters in low-cost display, lighting, and optical communication applications. The perovskite-based PeLEDs are fabricated using solution-processing techniques, which are cost-effective and scalable. The study highlights the advantages of organometal halide perovskites, including their solution-processability, tunable optical bandgap, and strong photoluminescent properties, making them excellent candidates for optoelectronic devices. The research also addresses the challenges of device degradation and efficiency drop-off at high current densities, showing that the polarization effect can enhance electroluminescence efficiency. The study further demonstrates the effectiveness of an ultra-thin Al₂O₃ layer in enhancing the luminescent efficiency of the PeLEDs. The research also shows the versatility of organometal halide perovskites in emitting visible and infrared light, with the green PeLED achieving electroluminescence at 517 nm and the red PeLED at 630 nm. The study concludes that these perovskites have great potential for large area optoelectronics and electrically-pumped lasing applications. The research is supported by the EPSRC (UK) and other funding bodies, and the authors contributed to the design, fabrication, and analysis of the devices. The study provides insights into the performance and potential of organometal halide perovskites in optoelectronic applications.This study presents high brightness light-emitting diodes (PeLEDs) based on solution-processed organometal halide perovskites. The research demonstrates electroluminescence in the near-infrared, green, and red regions by tuning the halide compositions in the perovskite. The infrared PeLED achieves a radiance of 13.2 W sr⁻¹ m⁻² at a current density of 363 mA cm⁻², with external and internal quantum efficiencies of 0.76% and 3.4%, respectively. The green PeLED achieves a luminance of 364 cd m⁻² at a current density of 123 mA cm⁻², with external and internal quantum efficiencies of 0.1% and 0.4%, respectively. The study shows that radiative bimolecular recombination dominates at higher excitation densities, leading to increased quantum efficiencies at higher current densities. The research also demonstrates the potential of these perovskites for efficient and color-tunable light emitters in low-cost display, lighting, and optical communication applications. The perovskite-based PeLEDs are fabricated using solution-processing techniques, which are cost-effective and scalable. The study highlights the advantages of organometal halide perovskites, including their solution-processability, tunable optical bandgap, and strong photoluminescent properties, making them excellent candidates for optoelectronic devices. The research also addresses the challenges of device degradation and efficiency drop-off at high current densities, showing that the polarization effect can enhance electroluminescence efficiency. The study further demonstrates the effectiveness of an ultra-thin Al₂O₃ layer in enhancing the luminescent efficiency of the PeLEDs. The research also shows the versatility of organometal halide perovskites in emitting visible and infrared light, with the green PeLED achieving electroluminescence at 517 nm and the red PeLED at 630 nm. The study concludes that these perovskites have great potential for large area optoelectronics and electrically-pumped lasing applications. The research is supported by the EPSRC (UK) and other funding bodies, and the authors contributed to the design, fabrication, and analysis of the devices. The study provides insights into the performance and potential of organometal halide perovskites in optoelectronic applications.