Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 765, Issue -, Pages 236-244Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.06.173
Keywords
Ag-Zn-In-S nanocrystal; Mn doping; Optical properties; Time-gated fluorescence measurement
Categories
Funding
- NIH [1P20GM103650-5248]
- InNEVenture Fund from Nevada Research and Innovation Corporation
- University of Nevada Reno
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [P20GM103650] Funding Source: NIH RePORTER
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In this work, Mn-doped AZIS/ZnS NCs were prepared using a nucleation doping approach with the tuning of Mn and Ag levels in their synthesis. The optical properties of Mn:AZIS/ZnS NCs are found to be significantly affected by Ag and Mn levels. Specifically, more Ag and Mn atoms in Mn:AZIS/ZnS NCs cause their fluorescence red-shift, and as the Ag or Mn level reaches a high threshold, the fluorescence lifetime of Mn:AZIS/ZnS NC has a significant drop. The reasons for the effects of Mn and Ag levels on NC optical properties were explored and discussed. Through this study, it is also found that with certain Ag and Mn levels in synthesis, some Mn:AZIS/ZnS NCs present optimal optical properties including high brightness (QY > 40%), long fluorescence lifetime (>1.2 ms), low energy for excitation (excitable at 405 nm), and no reabsorption. The feasibility of the optimized NCs for time-gated fluorescence measurement using a portable/compact instrument was further demonstrated, which indicates the application potential of the NCs in time-gated biosensing including point-of-care testing. Notably, this study also discloses that Mn:AZIS/ZnS NCs with different lifetimes can be achieved by tuning Mn and Ag levels in synthesis, which may further broaden the applications of Mn:AZIS/ZnS NCs in multiplexing detection/measurement. (C) 2018 Elsevier B.V. All rights reserved.
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