研究目的
Investigating the excitonic circular polarization from CdSe/CdMnS core/shell nanoplatelets with a bilayer core and its implications for lasers and light-emitting diodes.
研究成果
The study demonstrates the ability to switch the excitonic circular polarization depending on the excitation wavelength, with potential applications in lasers and LEDs. The switching rate could reach tens of GHz, suggesting applications in circularly polarized filters and polarizers.
研究不足
The study is limited to low temperatures (T = 7 K) and requires an external magnetic field to observe the excitonic circular polarization. The switching rate of the excitonic circular polarization is limited by the lifetime of the excitonic ground state.
1：Experimental Design and Method Selection:
Time-resolved photoluminescence (TRPL) spectroscopy was used to study the excitonic circular polarization (PX) from CdSe/CdMnS core/shell nanoplatelets (NPLs) with a bilayer core. The study involved varying magnetic ?eld, temperature, doping concentration, and excitation wavelength.
2：Sample Selection and Data Sources:
The samples were CdSe/CdMnS core/shell NPLs with two different Mn concentrations, 3% (high) and 1% (low).
3：List of Experimental Equipment and Materials:
A variable temperature optical cryostat equipped with a 7 T superconducting magnet, a pulsed laser system with wavelengths of 400 and 515 nm, and a spectrometer/streak camera combination with a temporal resolution of 30 ps.
4：Experimental Procedures and Operational Workflow:
The NPLs emission was collected and spectrally/temporally analyzed using a spectrometer/streak camera combination. The time-resolved σ+ and σ? PL components were separated using a combination of a quarter wave plate and a linear polarizer.
5：Data Analysis Methods:
The degree of circular polarization at particular photon energy was defined as P = (I+ - I?)/(I+ + I?) where I+(I?) is the intensity of the σ+(σ?) component.
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