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Colloidal Second Near‐Infrared‐Emitting Mn‐Doped Ag 2 S Quantum Dots
Author(s) -
Jeong Sanghwa,
Doh Hyunmi,
Kim Sungjee
Publication year - 2020
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.202000086
Subject(s) - photoluminescence , quantum dot , materials science , doping , nanocrystal , monoclinic crystal system , dopant , manganese , electron paramagnetic resonance , infrared , spectroscopy , analytical chemistry (journal) , infrared spectroscopy , ferromagnetism , magnetic semiconductor , nanotechnology , crystal structure , crystallography , optoelectronics , nuclear magnetic resonance , chemistry , condensed matter physics , optics , physics , organic chemistry , quantum mechanics , chromatography , metallurgy
Incorporation of transition metal dopants within a semiconductor nanocrystal has a tremendous effect on the optical and magnetic properties of the semiconductor nanocrystals. Herein, we report on a novel synthesis of second near‐infrared‐emitting photoluminescent Mn 2+ ‐doped Ag 2 S quantum dots via co‐pyrolysis of silver and manganese single‐source precursors. The Mn 2+ doping level was flexibly tuned in Ag 2 S quantum dots, which was confirmed by elemental analysis and electron paramagnetic resonance spectroscopy. The Mn 2+ doping induced negligible change in the pristine monoclinic acanthite Ag 2 S crystal structure but significantly decreased the photoluminescent intensity. Mn 2+ ‐doped Ag 2 S QDs exhibit second near‐infrared emission and ferromagnetic ordering, which show the potential applicability for multimodal fluorescence/MRI probes.