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Advanced Materials

Observation of Lasing Emission from Carbon Nanodots in Organic Solvents

Authors

  • W. F. Zhang,

    1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
    Current affiliation:
    1. These authors contributed equally to this work.
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  • H. Zhu,

    1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
    Current affiliation:
    1. These authors contributed equally to this work.
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  • S. F. Yu,

    Corresponding author
    1. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
    • Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
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  • H. Y. Yang

    1. Pillar of Engineering Product Department, Singapore University of Technology and Design, 138682, Singapore
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Abstract

Lasing is observed from carbon nanodots (C-dots) dispersed into a layer of poly(ethylene glycol) coated on the surface of optical fibers under 266 nm optical excitation. This is due to the enhancement of photoluminescence intensity via the esterification of carboxylic groups of the C-dots, and the formation of high-Q cylindrical microcavities to support second-type whispering gallery modes.

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