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Frequency Stabilization and Optically Tunable Lasing in Colloidal Quantum Dot Superparticles
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DOI：10.1021/acs.nanolett.2c04498.png)
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Abstract
En 中文
Self-assembled superparticles composed of colloidal quantum dots establish microsphere cavities that support optically pumped lasing from whispering gallery modes. Here, we report on the time-and excitation fluence-dependent lasing properties of CdSe/CdS quantum dot superparticles. Spectra collected under constant photoexcitation reveal that the lasing modes are not temporally stable but instead blue-shift by more than 30 meV over 15 min. To counter this effect, we establish a high-fluence light soaking protocol that reduces this blue-shift by more than an order of magnitude to 1.7 +/- 0.5 meV, with champion superparticles displaying mode blue-shifts of <0.5 meV. Increasing the pump fluence allows for optically controlled, reversible, color-tunable red to-green lasing. Combining these two paradigms suggests that quantum dot superparticles could serve in applications as low-cost, robust, solution-processable, tunable microlasers.
Keywords:
nanocrystal
quantum dot
superparticle
supraparticle
lasing
optical stability
tunable laser