Perovskites with spin-polarized properties are promising for realizing spin light-emitting diodes (spin-LEDs), yet achieving devices with high dissymmetry factors at room temperature remains a significant challenge due to the difficulty in creation of a nonequilibrium spin population. Here, we demonstrate a quasi-two-dimensional (2D) perovskite with spin-polarized fluorescence and its spin-LED at room temperature based on chiral-induced spin selectivity (CISS). By incorporating an achiral organic spacer in a chiral quasi- 2D film, we engineer a type II interface within the film to guarantee an effective interphase carrier transfer from the low-n chiral quantum well (QW) with a large exciton binding energy to the high-n QW. In addition, the uniformly vertically distributed chiral QW (n = 1) with random orientations in the film is favorable for interphase carrier tunneling through organic chiral spacers and hence improved CISS efficiency. Finally, we realize a spin-LED at room temperature with a |g_CP-EL| of ∼0.103. Our research reveals that instead of solely concentrating on organic chiral spacers with limited choice, employing achiral spacers to adjust the film’s energy landscape, QW distribution, and arrangement is a more effective approach to achieve CISS and spin-polarized emission in a quasi-2D perovskite film.

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基于手性诱导自旋选择性的高效准二维钙钛矿自旋发光二极管

具有自旋极化特性的钙钛矿有望用于实现自旋发光二极管（spin-LED），但由于难以创建非平衡自旋群体，在室温下实现具有高不对称因子的器件仍然是一个重大挑战。在这里，我们展示了一种具有自旋偏振荧光的准二维（2D）钙钛矿及其基于手性诱导自旋选择性（CISS）的室温自旋LED。通过在手性准二维薄膜中加入非手性有机间隔物，我们在薄膜内设计了 II 型界面，以保证从具有大激子结合能的低n手性量子阱 (QW) 到高 n 手性量子阱 (QW) 的有效相间载流子转移。 - n QW。此外，薄膜中具有随机取向的均匀垂直分布的手性量子阱（n = 1）有利于相间载流子通过有机手性间隔物隧穿，从而提高CISS效率。最后，我们在室温下实现了自旋 LED g _CP-EL | ～0.103。我们的研究表明，与其仅仅关注选择有限的有机手性间隔基，采用非手性间隔基来调整薄膜的能量分布、量子线分布和排列是在准二维钙钛矿中实现 CISS 和自旋极化发射的更有效方法电影。