Publication date: 15th May 2025
Colloidal semiconductor nanocrystal lasers currently face significant challenges, including high lasing thresholds, rapid energy losses via Auger recombination, and environmental sensitivity, which limit their practical usability and broader adoption. In this work, we present self-assembled microscale supraparticles composed of CdSe/ZnS quantum dots (QDs) and CdSe/CdₓZn₁₋ₓS nanoplatelets (NPLs). These supraparticles demonstrate low-threshold, stable lasing enabled by efficient, cavity-enhanced energy transfer from QDs to NPLs. The broad absorption spectrum of QDs effectively channels excitation energy into NPLs, facilitating stable lasing via whispering gallery modes with a notably low threshold of 0.35 mJ/cm². Importantly, these supraparticles are substrate-free, exhibiting sustained optical performance even after prolonged exposure to high fluence illumination in ambient air, highlighting their practical advantages for applications in optoelectronic devices and advanced pigment technologies. This supraparticle strategy thus provides a versatile and programmable pathway to achieving robust optical amplification and customizable spectral properties within colloidal photonic structures.
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