Metal halide perovskite nanocrystals have shown tremendous potential for application in light-emitting diodes (LEDs) due to their unique and remarkable optoelectronic properties. Here, we report the development of CsPbBr₃ nanoplatelets (NPLs) with surface passivation by organic semiconducting ligands for blue LEDs. The use of two organic salts, triphenyl (9-phenyl-9H-carbazol-3-yl) phosphonium sulfate (TPPcarz₂SO₄) and triphenyl (9-phenyl-9H-carbazol-3-yl) phosphonium bromide (TPPcarzBr), as surface treatment agents allows for the preparation of 300 nm size CsPbBr₃ NPLs with a blue emission peaked at 455 nm and a photoluminescence quantum efficiency (PLQE) of 82%. Moreover, the charge-transporting TPPcarz⁺ units improve the conductivity of thin films based on CsPbBr₃ NPLs and the band edge alignments for blue LEDs. As a result, blue LEDs based on these CsPbBr₃ NPLs exhibit high external quantum efficiencies (EQEs) of up to 4.15%, a maximum luminance of 1511 cd m^–2, and a half-lifetime of 50 min (at 100 cd/cm²).

中文翻译：

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用于蓝色发光二极管的有机半导体配体钝化 CsPbBr3 纳米片

金属卤化物钙钛矿纳米晶由于其独特而卓越的光电特性，在发光二极管（LED）方面显示出巨大的应用潜力。_{在此，我们报告了用于蓝色 LED 的有机半导体配体表面钝化的 CsPbBr 3}纳米片 (NPL)的开发。使用两种有机盐，三苯基(9-苯基-9H-咔唑-3-基)硫酸鏻(TPPcarz ₂ SO ₄ )和三苯基(9-苯基-9H-咔唑-3-基)溴化鏻(TPPcarzBr)，作为表面处理剂，可以制备 300 nm 尺寸的 CsPbBr ₃ NPL，其蓝色发射峰值为 455 nm，光致发光量子效率 (PLQE) 为 82%。此外，电荷传输TPPcarz ^{+单元提高了基于CsPbBr} ₃ NPL的薄膜的电导率和蓝色LED 的能带边缘排列。因此，基于这些 CsPbBr ₃ NPL 的蓝色 LED 表现出高达 4.15% 的高外量子效率 (EQE)、1511 cd m ^–2的最大亮度和 50 分钟的半衰期（在 100 cd/cm 下）²）。