Researchers achieved a breakthrough in producing deep-blue light-emitting diodes (LEDs) using colloidal cesium lead bromide (CsPbBr3) nanoplatelets, meeting stringent Rec.2020 color standards for displays. This advancement addresses longstanding challenges in stable, efficient, color-pure deep-blue LEDs, heralding improved next-generation optoelectronic devices and consumer displays with enhanced color gamut and efficiency.