磁掺杂在二维层状卤化物钙钛矿中诱导强圆偏振光发射和检测,Advanced Optical Materials

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磁掺杂在二维层状卤化物钙钛矿中诱导强圆偏振光发射和检测
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-05-01 , DOI: 10.1002/adom.202200183
Ying Liu ₁ , Ying Jiang ₂ , Zheyuan Xu ₁ , Lihui Li ₂ , Danliang Zhang ₂ , Weihao Zheng ₁ , Delang Liang ₁ , Biyuan Zheng ₁ , Huawei Liu ₁ , Xingxia Sun ₁ , Chenguang Zhu ₁ , Lu Lin ₁ , Xiaoli Zhu ₁ , Huigao Duan ₃ , Quan Yuan ₄ , Xiao Wang ₂ , Shuangyin Wang ₄ , Dong Li ₁ , Anlian Pan ₁

Affiliation

偏振光的产生、操纵和检测是自旋光电子学的基础。偏振光在新一代信息传输、存储、量子通信等领域有着广泛的应用。近年来，有机-无机杂化卤化物钙钛矿因其强自旋轨道耦合、Rashba分裂、自旋相关光学选择而引起广泛关注，并被认为是在自旋光电器件中应用的有希望的候选者。在此，作者报告成功合成了掺杂磁性金属 Co ²⁺的二维层状卤化铅钙钛矿 (PEA) ₂ PbI _{4 (PEI)}并观察强圆偏振光致发光和光响应。在钙钛矿中引入磁性金属可以在系统中引起类似的塞曼效应，这可以增加其能量简并性，导致电子自旋态的不平衡群体，从而增强掺杂样品中的自旋极化。因此，在室温下观察到 35% 的最大圆极化 PL。此外，获得的Co ²⁺掺杂(PEA) ₂ PbI ₄还表现出具有圆偏振光 (CPL) 发射的选择性光响应，并且实现了 0.41 的出色的光电流各向异性因子。实验结果为磁性掺杂钙钛矿的可控合成以及在自旋光电子学中直接CPL检测的应用奠定了基础。

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Magnetic Doping Induced Strong Circularly Polarized Light Emission and Detection in 2D Layered Halide Perovskite

The generation, manipulation, and detection of polarized light are the foundations of spin optoelectronics. Polarized light has a wide range of applications in new-generation information transmission, storage, and quantum communications. Hybrid organic–inorganic halide perovskites have attracted extensive attention recently because of their strong spin–orbit coupling, Rashba splitting, spin-dependent optical selection, and have been regarded as promising candidates for application in spin optoelectronic devices. Herein, the authors report the successful synthesis of 2D layered lead halide perovskites (PEA)₂PbI₄ (PEI) doped with magnetic metal Co²⁺ and the observation of strong circularly polarized photoluminescence and photoresponse. The introduction of magnetic metals in perovskites can induce an analogous Zeeman effect in the system, which can increase its energy degeneracy, giving rise to an imbalanced population of electronic spin states, thereby enhancing the spin polarization in doped samples. Thus, a maximum circularly polarized PL of 35% is observed at room temperature. Moreover, the achieved Co²⁺-doped (PEA)₂PbI₄ also exhibits a selective photoresponse with circularly polarized light (CPL) emission, and an outstanding anisotropy factor of 0.41 for photocurrent is achieved. The experimental results lay the foundation for the controlled synthesis of magnetically doped perovskites as well as applications for direct CPL detection in spin optoelectronics.

更新日期：2022-05-01

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