Bright Fluorophores in the Second Near-Infrared Window: HgSe/CdSe Quantum Dots

Ananth Kamath, Richard D. Schaller, Philippe Guyot-Sionnest*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Fluorophores emitting in the NIR-IIb wavelength range (1.5-1.7 μm) show great potential for bioimaging due to their large tissue penetration. However, current fluorophores suffer from poor emission with quantum yields ∼2% in aqueous solvents. In this work, we report the synthesis of HgSe/CdSe core/shell quantum dots (QDs) emitting at 1.7 μm through the interband transition. Growth of a thick shell led to a drastic increase in the photoluminescence quantum yield, with a value of 63% in nonpolar solvents. The quantum yields of our QDs and other reported QDs are explained well by a model of Forster resonance energy transfer to ligands and solvent molecules. The model predicts a quantum yield >12% when these HgSe/CdSe QDs are solubilized in water. Our work demonstrates the importance of a thick type-I shell to obtain bright emission in the NIR-IIb region.

Original languageEnglish (US)
Pages (from-to)10809-10816
Number of pages8
JournalJournal of the American Chemical Society
Issue number19
StatePublished - May 17 2023

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry
  • Catalysis
  • Colloid and Surface Chemistry


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