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Lasing behavior of surface functionalized carbon quantum dot/RhB composites.

Ashish Yadav1, Liang Bai, Yanmei Yang

  • 1Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, China. ljiang@suda.edu.cn chilf@suda.edu.cn zhkang@suda.edu.cn.

Nanoscale
|April 12, 2017
PubMed
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We explored carbon quantum dot (CQD)/Rhodamine B (RhB) composites for random laser applications. Functionalized CQD/RhB composites demonstrated tunable lasing emission, influenced by CQD surface properties and pH.

Area of Science:

  • Materials Science
  • Optics and Photonics
  • Quantum Dots

Background:

  • Random lasers are crucial for fundamental research and applications.
  • Carbon quantum dots (CQDs) offer broad emission spectra.
  • Rhodamine B (RhB) dye has a well-defined absorption spectrum.

Purpose of the Study:

  • To investigate the lasing behavior of carbon quantum dot (CQD)/Rhodamine B (RhB) composites.
  • To explore the influence of CQD surface functionalization on lasing properties.
  • To understand the role of pH in the lasing performance of CQD/RhB composites.

Main Methods:

  • Fabrication of CQD/RhB composites with various functional groups (-OH, -NH2, -PO4).
  • Optical pumping of the composites to induce lasing.

Related Experiment Videos

  • Characterization of lasing emission properties, including wavelength tunability and linewidth.
  • Investigation of the effect of pump energy and pH on lasing behavior.

    • Main Results:

    • CQD/RhB composites exhibited tunable random lasing emission.
    • Lasing properties were dynamically controlled by the surface properties of CQDs.
    • PO4-CQD/RhB composites showed a linewidth of 3.2 nm at 587 nm with 1.86 mJ pump energy.
    • The pH of the CQD solution significantly impacted the lasing behavior.

    Conclusions:

    • Functionalized CQD/RhB composites are promising for random laser applications.
    • Surface chemistry of CQDs and solution pH are critical parameters for tuning lasing characteristics.
    • This work opens avenues for developing novel tunable random lasers.