Circularly polarized luminescence is an attractive characteristic of chiral perovskite nanocrystals, as it opens possibilities for applications such as spin-polarized light-emitting diodes and chiral light-selective photodetectors. While previous research has mainly focused on green- and red-emitting chiral perovskite nanocrystals, the exploration of blue-emitting counterparts with efficient circularly polarized luminescence activity is still in its early stages. Here, we synthesize nanocubes, nanoribbons, and nanowires of CsPbBr₃ perovskites, which exhibited strong blue emission thanks to quantum confinement in at least two dimensions. Their chiral induction is achieved by attaching chiral molecules (R/S-methylbenzylammonium bromide) to the surface of nanocrystals, resulting in circular dichroism and circularly polarized luminescence. Upon attachment of chiral ligands, the average absorption dissymmetry factor, |g_abs|, reached 9 × 10^–5 for nanocubes, 1.5 × 10^–4 for nanoribbons, and 2.9 × 10^–4 for nanowires, thus clearly revealing shape-dependence. Moreover, we achieved blue circular polarized luminescence for all three kinds of samples, with the average luminescence dissymmetry factor, |g_lum|, of 1.4 × 10^–4, 4 × 10^–4, and 5.2 × 10^–4 for nanocubes, nanoribbons, and nanowires, respectively.

中文翻译：

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不同形状各向异性程度的量子限制 CsPbBr3 纳米晶体的蓝色圆偏振发光

圆偏振发光是手性钙钛矿纳米晶体的一个有吸引力的特性，因为它为自旋偏振发光二极管和手性光选择性光电探测器等应用开辟了可能性。虽然之前的研究主要集中在发绿光和红光的手性钙钛矿纳米晶体上，但对具有高效圆偏振发光活性的蓝光对应物的探索仍处于早期阶段。在这里，我们合成了 CsPbBr ₃钙钛矿的纳米立方体、纳米带和纳米线，由于至少二维的量子限制，它们表现出强烈的蓝色发射。它们的手性诱导是通过将手性分子（R/S-甲基苄基溴化铵）附着到纳米晶体的表面来实现的，从而产生圆二色性和圆偏振发光。连接手性配体后，纳米立方体的平均吸收不对称因子 |g _abs | 达到 9 × 10 ^–5，纳米带达到 1.5 × 10 ^–4，纳米线达到 2.9 × 10 ^–4，从而清楚地揭示了形状依赖性。此外，我们对所有三种样品均实现了蓝色圆偏振发光，纳米立方体、纳米带的平均发光不对称因子|g _lum |分别为1.4 × 10 ^–4、4 × 10 ^–4和5.2 × 10 ^–4，和纳米线，分别。