Low threshold lasing emissions from a single upconversion nanocrystal

Yunfei Shang, Jiajia Zhou (), Yangjian Cai, Fan Wang, Angel Fernandez-Bravo, Chunhui Yang, Lei Jiang and Dayong Jin
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Yunfei Shang: University of Technology Sydney
Jiajia Zhou: University of Technology Sydney
Yangjian Cai: Southern University of Science and Technology
Fan Wang: University of Technology Sydney
Angel Fernandez-Bravo: Politecnico di Milano
Chunhui Yang: Harbin Institute of Technology
Lei Jiang: Chinese Academy of Sciences
Dayong Jin: University of Technology Sydney

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Cross-relaxation among neighboring emitters normally causes self-quenching and limits the brightness of luminescence. However, in nanomaterials, cross-relaxation could be well-controlled and employed for increasing the luminescence efficiency at specific wavelengths. Here we report that cross-relaxation can modulate both the brightness of single upconversion nanoparticles and the threshold to reach population inversion, and both are critical factors in producing the ultra-low threshold lasing emissions in a micro cavity laser. By homogenously coating a 5-μm cavity with a single layer of nanoparticles, we demonstrate that doping Tm3+ ions at 2% can facilitate the electron accumulation at the intermediate state of 3H4 level and efficiently decrease the lasing threshold by more than one order of magnitude. As a result, we demonstrate up-converted lasing emissions with an ultralow threshold of continuous-wave excitation of ~150 W/cm2 achieved at room temperature. A single nanoparticle can lase with a full width at half-maximum as narrow as ~0.45 nm.

Date: 2020
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DOI: 10.1038/s41467-020-19797-4

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