Yao Jingwen, Huang Yuling, Sun Haifeng, Wang Zhiyu, Xue Jie, Huang Zhifeng, Dong Shou-Cheng, Chen Xihan, Lu Haipeng
Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, 999077, P. R. China.
SUSTech Energy Institute for Carbon Neutrality, Depart of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China.
Adv Mater. 2025 Mar;37(10):e2413669. doi: 10.1002/adma.202413669. Epub 2025 Jan 29.
Spin light-emitting diodes (spin-LEDs) are important for spin-based electronic circuits as they convert the carrier spin information to optical polarization. Recently, chiral-induced spin selectivity (CISS) has emerged as a new paradigm to enable spin-LED as it does not require any magnetic components and operates at room temperature. However, CISS-enabled spin-LED with tunable wavelengths ranging from red to near-infrared (NIR) has yet to be demonstrated. Here, chiral quasi-2D perovskites are developed to fabricate efficient spin-LEDs with tunable wavelengths from red to NIR region by tuning the halide composition. The optimized chiral perovskite films exhibit efficient circularly polarized luminescence from 675 to 788 nm, with a photoluminescence quantum yield (PLQY) exceeding 86% and a dissymmetry factor (g) ranging from 8.5 × 10 to 2.6 × 10. More importantly, direct circularly polarized electroluminescence (CPEL) is achieved at room temperature in spin-LEDs. This work demonstrated efficient red and NIR spin-LEDs with the highest external quantum efficiency (EQE) reaching 12.4% and the electroluminescence (EL) dissymmetry factors (g) ranging from 3.7 × 10 to 1.48 × 10 at room temperature. The composition-dependent CPEL performance is further attributed to the prolonged spin lifetime as revealed by ultrafast transient absorption spectroscopy.
自旋发光二极管（spin-LEDs）对于基于自旋的电子电路很重要，因为它们将载流子自旋信息转换为光偏振。最近，手性诱导自旋选择性（CISS）作为一种新的范例出现，使得自旋发光二极管成为可能，因为它不需要任何磁性组件且能在室温下工作。然而，具有从红色到近红外（NIR）可调波长的基于CISS的自旋发光二极管尚未得到证实。在此，通过调整卤化物组成，开发了手性准二维钙钛矿来制造具有从红色到近红外区域可调波长的高效自旋发光二极管。优化后的手性钙钛矿薄膜在675至788纳米范围内表现出高效的圆偏振发光，光致发光量子产率（PLQY）超过86%，不对称因子（g）范围为8.5×10至2.6×10。更重要的是，在自旋发光二极管中室温下实现了直接圆偏振电致发光（CPEL）。这项工作展示了高效的红色和近红外自旋发光二极管，其在室温下的最高外量子效率（EQE）达到12.4%，电致发光（EL）不对称因子（g）范围为3.7×10至1.48×10。超快瞬态吸收光谱表明，与组成相关的CPEL性能进一步归因于自旋寿命的延长。
