Halogen-Bonding-Assisted Synthesis of CsPbI<sub>3</sub> Perovskite Nanocrystal Emission Materials for Stable and Efficient Pure-Red LEDs.
basic_science · Level V
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- Record sourced from PubMed, PMID 42549949.
- Also identified by DOI 10.1002/adma.74435.
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Abstract
Perovskite nanocrystals (NCs) demonstrate exceptional potential as emitters to address Rec. 2020 standards for wide color gamut displays. However, the pure-red-targeted CsPbI<sub>3</sub> NCs generally suffer from imprecise synthetic control over emission wavelength and from structural instabilities that significantly diminish performance. We report a novel halogen engineering framework that addresses the otherwise unfavorable wavelength-efficiency-stability nexus. Our approach leverages surface I<sup>-</sup>···I<sub>2</sub> interactions to simultaneously unlock exceptional optical characteristics and the elusive structural robustness needed for application. It achieves: (i) controlled quantum-confinement-tuned emission wavelength, (ii) near-unity photoluminescence (PL) quantum yield through iodide vacancy defect management, and (iii) excellent environmental stability, even under harsh (85°C/85%) temperature and humidity conditions, through lattice-distortion suppression. Rec. 2020 compliant, 638 nm peak light-emitting diodes (LEDs) are then demonstrated with Commission Internationale de l'Éclairage coordinates (X, Y) = (0.703, 0.297), 22% external quantum efficiency, luminance ≥ 11,000 cd m<sup>-2</sup>, and long lifetime, establishing a materials-by-design paradigm for advancing next-generation perovskite display technologies.