Experimental study demonstrates high-efficiency deep-blue perovskite quantum dot LEDs via Lewis acid surface reconstruction, indicating a viable pathway toward standard-compliant displays.
Perovskite quantum dot light-emitting diodes (PQD LEDs) are promising candidates for high-color-gamut displays, yet deep-blue devices meeting the Rec. 2020 standard with high efficiency and stability remain a tremendous challenge. Here we present a Lewis acid-driven surface reconstruction strategy to enable high-performance deep-blue CsPbBr3 PQD LEDs. Strong ionic interactions between Sr2+ and octanoic acid promote octylamine protonation, triggering simultaneous PQD size reduction, defect suppression, and photoluminescence quantum yield (PLQY) enhancement. The reconstructed PQDs exhibit deep-blue emission at 461 nm with a narrow 18 nm full width at half-maximum and a PLQY of 80%. The resulting LEDs deliver 98.1% color purity, color coordinates of (0.146, 0.059), and full compliance with Rec. 2020 blue specifications. A peak external quantum efficiency of 8.5% and an operational half-lifetime of 41 min are achieved, among the highest reported for pure-bromide deep-blue PQD LEDs. This work provides a facile surface-engineering strategy for efficient deep-blue optoelectronics.
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Chen et al. (2026) studied this question.
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