Gao Haotian, Chen Yu, Zhang Ruxi, Cao Rui, Wang Yong, Tian Yunfei, Xiao Yin
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China.
Mater Horiz. 2024 Jun 17;11(12):2906-2913. doi: 10.1039/d3mh02029k.
Spin-LEDs have been a central topic in semiconductor spintronics research and represent a promising avenue for advanced optoelectronic devices and applications. The future advancements of spin-LEDs will undoubtedly hinge on the generation and manipulation of spin-polarized population at room temperature. In this research, we elucidate the development of room-temperature spin-LEDs using quasi-2D perovskites, based on the chiral-induced spin selectivity (CISS) effect. During the carrier transfer from the chiral 2 phase to the randomly oriented high- phase caused by the bandgap gradient distribution, CISS works to generate non-equilibrium spin population, leading to room-temperature spin-polarized fluorescence. A spin-polarization of ∼93% is observed for the films. Finally, we realize spin-LEDs at room temperature, exhibiting a || value of 0.05 and an EQE of 3.8%. This work highlights the potential of integrating dual ligands to optimize the phase distribution and crystalline orientation in quasi-2D films to achieve efficient CISS for spin-LED applications.
自旋发光二极管一直是半导体自旋电子学研究的核心课题，代表了先进光电器件及应用的一条充满前景的途径。自旋发光二极管未来的进展无疑将取决于室温下自旋极化载流子的产生与操控。在本研究中，我们基于手性诱导自旋选择性（CISS）效应，阐明了使用准二维钙钛矿实现室温自旋发光二极管的进展。在由带隙梯度分布导致的载流子从手性2相转移至随机取向的高相的过程中，CISS作用产生非平衡自旋载流子，从而导致室温自旋极化荧光。对于这些薄膜，观察到了约93%的自旋极化率。最后，我们实现了室温自旋发光二极管，其||值为0.05，外量子效率为3.8%。这项工作突出了整合双配体以优化准二维薄膜中的相分布和晶体取向，从而实现用于自旋发光二极管应用的高效CISS的潜力。
