Blue-Emissive Perovskite Quantum Dot for Light-Emitting Diodes
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초록
내용
Metal halide perovskites (MHPs) have gained attraction as high-performance light-emitting diode (LED) materials owing to their excellent optical properties, such as facile bandgap tuning, defect tolerance, and high color purity. Nevertheless, blue-emitting MHP LEDs show only marginal progress in device efficiency compared with green and red LEDs. Herein, a novel strategy for highly efficient, stable CsPbBr3 QDs via in situ surface reconstruction of CsPbBr3–Cs4PbBr6 nanocrystals (NCs) is reported. By controlling precursor reactivity, the ratio of CsPbBr3 to Cs4PbBr6 NCs is successfully modulated. . A high photoluminescence quantum yield (PLQY) of >90% at 470 nm is obtained because octahedron CsPbBr3 QD surface defects are removed by the Cs4PbBr6 NCs. The defect-engineered QDs exhibit high colloidal and thermal stability.