Layered hybrid organic–inorganic metal‐halide perovskites (HOIPs) can acquire chirality from molecules incorporated into their structure showing exciting possibilities in optoelectronics and spintronics. However, researchers have focused their attention on the study of bulk compounds, namely unstable and toxic Pb HOIPs. Herein, the chiroptical properties of R‐ and S‐β‐methylphenethylammonium Mn chloride HOIPs are reported in both the bulk and the few‐layer limit as exfoliated flakes. Red photoluminescence (PL) emission originating from the octahedrally coordinated Mn2+ is observed, with a PL shift to longer wavelengths when passing from bulk to flakes. Circular dichroism and circularly polarized PL mirrored‐signals for enantiomers are found in bulk samples, while in flakes, a degree of circularly polarized emission (P) of up to 17% at 80 K is achieved, comparable to Pb‐based HOIPs. Moreover, angle‐resolved PL measurements on flakes show that the PL emission and P are isotropic. These findings highlight the potential of these HOIPs from bulk to flakes for spin‐optoelectronic applications.

中文翻译：

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手性杂化有机-无机卤化锰钙钛矿中的圆偏振光致发光：从块状材料到剥离薄片

层状杂化有机-无机金属卤化物钙钛矿（HOIP）可以从纳入其结构的分子中获得手性，这在光电子学和自旋电子学中显示出令人兴奋的可能性。然而，研究人员将注意力集中在大块化合物的研究上，即不稳定且有毒的 Pb HOIP。在此，R-和S-β-甲基苯乙基氯化锰HOIPs的手性光学性质以剥离薄片的形式在块体和少层极限中报告。源自八面体配位 Mn 的红色光致发光 (PL) 发射2+观察到，当从块体转变为薄片时，PL 会向更长的波长移动。在散装样品中发现了对映体的圆二色性和圆偏振 PL 镜像信号，而在薄片中，在 80 K 时实现了高达 17% 的圆偏振发射 (P) 程度，与基于 Pb 的 HOIP 相当。此外，对薄片的角度分辨 PL 测量表明 PL 发射和 P 是各向同性的。这些发现凸显了这些 HOIP 从块状到片状在自旋光电应用中的潜力。