TY - JOUR
T1 - Bright Fluorophores in the Second Near-Infrared Window
T2 - HgSe/CdSe Quantum Dots
AU - Kamath, Ananth
AU - Schaller, Richard D.
AU - Guyot-Sionnest, Philippe
N1 - Funding Information:
A.K. is grateful to Aritrajit Gupta for performing SAXS measurements and to Jennifer Hollingsworth for helpful discussions. A.K. thanks Chris Melnychuk for performing preliminary lifetime measurements. A.K. thanks Dmitri Talapin and Bozhi Tian for helpful inputs. A.K. thanks Lauren McNamara for sharing CDCl for measurements. This work is supported by the U.S. DOE under award number DE-SC0023210. A.K. is supported by the Edith Barnard Memorial Fund from the Chemistry Department at the University of Chicago and by U.S. DOE DE-SC0023210. Work performed at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, was supported by the U.S. DOE, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. This work made use of the shared facilities at the University of Chicago Materials Research Science and Engineering Center, supported by National Science Foundation under award number DMR-2011854; the shared facilities at the University of Chicago Mass Spectrometry Facility, supported by National Science Foundation under award number CHE-1048528; and the University of Chicago electron microscopy facility (RRID:SCR_019198). 3
Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023/5/17
Y1 - 2023/5/17
N2 - 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.
AB - 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.
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U2 - 10.1021/jacs.3c02190
DO - 10.1021/jacs.3c02190
M3 - Article
C2 - 37134313
AN - SCOPUS:85159581978
SN - 0002-7863
VL - 145
SP - 10809
EP - 10816
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 19
ER -