激子
发光
磁圆二色性
兴奋剂
材料科学
光致发光
圆极化
掺杂剂
圆二色性
凝聚态物理
激发态
钙钛矿(结构)
磁性半导体
半导体
化学物理
光电子学
磁场
原子物理学
物理
化学
结晶学
谱线
天文
量子力学
作者
Zixuan Zhang,Wenfei Liang,Jie Xue,Xin Li,Kaifeng Wu,Haipeng Lu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-02-07
被引量:10
标识
DOI:10.1021/acsnano.3c12851
摘要
Magnetic impurity doping in semiconductors has emerged as an important strategy to endow exotic photophysical and magnetic properties. While most reported hosts are centrosymmetric semiconductors, doping magnetic ions into a noncentrosymmetric chiral semiconductor can offer additional control of photonic and spin polarization. In this work, we synthesized a Mn2+-doped chiral two-dimensional (2D) perovskite, Mn2+:(R-MPA)2PbBr4 (R-MPA+ = R-methyl phenethylammonium). We found that the optical activity of chiral 2D perovskites is enhanced with an increased concentration of Mn2+ ions. Additionally, efficient energy transfer from the chiral host to the Mn2+ dopants is observed. This energy transfer process gives rise to circularly polarized luminescence from the excited state of Mn2+ (4T1 → 6A1), exhibiting a photoluminescence quantum yield up to 24% and a dissymmetry factor of 11%. The exciton fine structures of undoped and Mn2+-doped (R-MPA)2PbBr4 are further studied through magnetic circular dichroism (MCD) spectroscopy. Our analysis shows that chiral organic cations lead to an exciton fine structure splitting energy as large as 5.0 meV, and the splitting is further increased upon Mn2+ doping. Our results reveal the strong impacts of molecular chirality and magnetic dopants on the exciton structures of halide perovskites.
科研通智能强力驱动
Strongly Powered by AbleSci AI