We demonstrate ultra-pure green and efficient light emitting diodes (LEDs) by employing the colloidal perovskite nanoplatelets (NPLs). Through the dielectric quantum wells engineering and aggregation induced emission, the perovskite NPLs exhibit an anomalously high photoluminescence quantum efficiency (ηPL) of 94% and a higher exciton binding energy (EB) in the thin solid films. The optimized devices show a high current efficiency of >20 cd A−1 and a maximum external quantum efficiency over 5%. The color gamut covers >97% of the Rec. 2020 gamut area in the CIE 1931 color space, demonstrating the “greenest” LEDs ever reported. We also present large-area (30 mm2) and flexible LEDs based on perovskite NPLs.
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