Ultralow-threshold multiphoton-pumped lasing from colloidal nanoplatelets in solution

Mingjie Li, Min Zhi, Hai Zhu, Wen Ya Wu, Qing Hua Xu, Mark Hyunpong Jhon, Yinthai Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

104 Citations (Scopus)


Although multiphoton-pumped lasing from a solution of chromophores is important in the emerging fields of nonlinear optofluidics and bio-photonics, conventionally used organic dyes are often rendered unsuitable because of relatively small multiphoton absorption cross-sections and low photostability. Here, we demonstrate highly photostable, ultralow-threshold multiphoton-pumped biexcitonic lasing from a solution of colloidal CdSe/CdS nanoplatelets within a cuvette-based Fabry-Pérot optical resonator. We find that colloidal nanoplatelets surprisingly exhibit an optimal lateral size that minimizes lasing threshold. These nanoplatelets possess very large gain cross-sections of 7.3 × 10-14 cm2 and ultralow lasing thresholds of 1.2 and 4.3 mJ cm-2 under two-photon (λexc =800 nm) and three-photon (λexc =1.3 μm) excitation, respectively. The highly polarized emission from the nanoplatelet laser shows no significant photodegradation over 107 laser shots. These findings constitute a more comprehensive understanding of the utility of colloidal semiconductor nanoparticles as the gain medium in high-performance frequency-upconversion liquid lasers.

Original languageEnglish
Article number8513
JournalNature Communications
Publication statusPublished - 30 Sept 2015
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General Physics and Astronomy


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