研究目的
To demonstrate room-temperature lasing emission with green gamut from GQDs in a vertical optical cavity composed of Ta2O5/SiO2 dielectric distributed Bragg reflectors (DBRs), showcasing the potential of GQDs as optical gain materials for wide-gamut laser displays and projectors.
研究成果
The study successfully demonstrated room-temperature operation of a GQD-VCSEL, marking a significant advancement in the use of GQDs as optical gain materials. The device exhibited multi-mode lasing with a primary peak at 550 nm, showing potential for applications in wide-gamut laser displays and projectors.
研究不足
The cavity length of the GQD-VCSEL was relatively thick (~5.0 μm) due to the high viscosity of the GQD aqueous solution, limiting further reduction in cavity length with current methods. The lasing emission was multi-mode with some inhomogeneity in cavity length due to nonuniformity of the GQDs layer.
1：Experimental Design and Method Selection:
The study utilized a vertical optical cavity composed of Ta2O5/SiO2 dielectric distributed Bragg reflectors (DBRs) to achieve lasing emission from GQDs. The DBR design provided a wide stopband overlapping with GQDs' emission and high UV-light transmittance for optical excitation.
2：Sample Selection and Data Sources:
GQDs were synthesized using the microwave-assisted hydrothermal method, and their optical properties were characterized.
3：List of Experimental Equipment and Materials:
Equipment included a frequency-doubled Q-switched Nd:YAG laser for optical excitation, a spectrometer for emission measurement, and SEM and AFM for material characterization.
4：Experimental Procedures and Operational Workflow:
GQDs were sandwiched between DBRs to form the laser cavity. The device was optically pumped, and lasing emission was measured.
5：Data Analysis Methods:
PL lifetime was analyzed using a stretched biexponential function to understand carrier dynamics.
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