Energy-Efficient Perovskite LEDs with Rec. 2020 Compliance

Perovskite LEDs (PeLEDs) show promise as a next-generation light source. For energy-efficient displays, PeLEDs with all-rounded performance combining high energy-conversion efficiencies (η ECE ), brightness, and stability with spectral compliance are required. However, such a demanding goal is yet to be achieved. Here we demonstrate PeLEDs exhibiting a high η ECE of 21.3%, exceptional brightness of ∼3.2 × 10 5 cd m –2 (max: ∼4.6 × 10 5 cd m –2 ), long lifetimes ( T 50 ) of ∼125 h at 1000 cd m –2 (extrapolated T 50: ∼4900 h at 100 cd m –2 ), and an unprecedented Rec. 2020 color gamut coverage of 97.7% for green LEDs. The η ECE values are record-high for visible PeLEDs, contrasting to most studies in which EQEs rather than the overall efficiencies are considered. We present how (i) the spectral tuning for Rec. 2020 compliance, (ii) the elimination of nonradiative traps for enhanced EQEs, brightness, and stability, and (iii) the low driving voltages for high η ECE are simultaneously achieved, paving the way toward energy-efficient PeLED displays.