研究目的
To investigate and understand the photoluminescence mechanism of PQDs, pure PQDs were prepared by ablating bulk black phosphorus with a pulsed laser beam in tetrahydrofuran, ethylene glycol, and polyethylene glycol solvents.
研究成果
The PQDs show intense, excitation wavelength-independence and multifrequency PL emissions. In particular, the PL frequencies are in the blue-violet region with wavelengths ranging from 400 to 475 nm, which represent the needed bright and stable PL material and possess potential applications in semiconductor light sources and even full-color displays.
研究不足
The study is limited by the complex energy bands of PQDs and a lack of effective PQD preparation methods, which limits the application of PQDs.
1：Experimental Design and Method Selection:
PQDs were prepared by ablating bulk black phosphorus with a pulsed laser beam in tetrahydrofuran, ethylene glycol, and polyethylene glycol solvents. The PL quantum yield of the PQDs was measured.
2：Sample Selection and Data Sources:
The size distribution, morphology, and structure of the PQDs were observed by transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The Raman spectrum of the PQDs was recorded. The Fourier transform infrared (FTIR) spectrum was measured. The PL spectrum and absolute quantum yield of the PQDs were obtained.
3：List of Experimental Equipment and Materials:
Nd:YAG pulsed laser, bulk black phosphorus target, tetrahydrofuran, ethylene glycol, and polyethylene glycol solvents.
4：Experimental Procedures and Operational Workflow:
The target black phosphorus was placed in a beaker with solvent, and the liquid level was higher than the target by approximately 5 mm. The laser ablation was performed for 30 min.
5：Data Analysis Methods:
The PL properties of the PQDs were analyzed via the detailed structures in the PL emission pro?le.
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