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CdSe/CdMnS Nanoplatelets with Bilayer Core and Magnetically Doped Shell Exhibit Switchable Excitonic Circular Polarization: Implications for Lasers and Light-Emitting Diodes
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-03-30 , DOI: 10.1021/acsanm.0c00365
Arman Najafi 1 , Steven Tarasek 1 , Savas Delikanli 2, 3 , Peiyao Zhang 1 , Tenzin Norden 1 , Sushant Shendre 2 , Manoj Sharma 2, 3 , Arinjoy Bhattacharya 1 , Nima Taghipour 3 , James Pientka 4 , Hilmi Volkan Demir 2, 3 , Athos Petrou 1 , Tim Thomay 1
Affiliation  

We utilized time-resolved photoluminescence (TRPL) spectroscopy to study the excitonic circular polarization (PX) from CdSe/CdMnS core/shell nanoplatelets (NPLs) with a bilayer core. This allows an extensive study of the emission dynamics as a function of magnetic field, temperature, doping concentration, and excitation wavelength. In the presence of an external magnetic field, pulsed excitation below the shell gap results in near-zero excitonic circular polarization PX at all time delays. In contrast, pulsed excitation with photon energy larger than the shell gap results in a rapid (100 ps) buildup of the excitonic circular polarization which subsequently remains constant at a level of up to 40%. We propose a model to describe the dynamics which takes into account the exchange interaction between carrier and magnetic ion (Mn) spins. The studied system exhibits a fast switchable excitonic circular polarization, implying possible applications in lasers and light emitting diodes.

中文翻译:

具有双层核心和磁性掺杂壳的CdSe / CdMnS纳米片展现出可开关的激子圆极化:对激光器和发光二极管的影响

我们利用时间分辨光致发光(TRPL)光谱研究了具有双层核的CdSe / CdMnS核/壳纳米片(NPL)的激子圆极化(P X)。这样就可以对作为磁场,温度,掺杂浓度和激发波长的函数的发射动力学进行深入研究。在存在外部磁场的情况下,壳间隙以下的脉冲激发会导致激子圆极化P X接近零在所有时间延迟。相比之下,光子能量大于壳隙的脉冲激发会导致激子圆极化迅速累积(100 ps),随后激子圆极化保持高达40%的恒定水平。我们提出了一个模型来描述动力学,该模型考虑了载流子和磁离子(Mn)自旋之间的交换相互作用。所研究的系统表现出快速可切换的激子圆极化,这暗示了其在激光器和发光二极管中的可能应用。
更新日期:2020-03-30
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