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Triplet Sensitization and Photon Upconversion Using InP-Based Quantum Dots.

Runchen Lai1, Youbao Sang2,3, Yang Zhao4

  • 1State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China.

Journal of the American Chemical Society
|November 10, 2020
PubMed
Summary
This summary is machine-generated.

We developed nontoxic indium phosphide (InP) quantum dots (QDs) for efficient triplet sensitization. These green QDs enable photon upconversion, matching the performance of toxic cadmium-based sensitizers.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Colloidal semiconductor nanocrystals, or quantum dots (QDs), are crucial for photochemical and photonic applications.
  • Current QD sensitizers frequently utilize toxic elements like cadmium (Cd) and lead (Pb), driving the need for greener alternatives.

Purpose of the Study:

  • To investigate triplet energy transfer from indium phosphide (InP)-based quantum dots as a sustainable alternative to toxic heavy metal QDs.
  • To engineer InP/ZnSe/ZnS core/shell QDs to overcome limitations like hole trapping and enable efficient triplet sensitization.

Main Methods:

  • Utilized time-resolved spectroscopy to study energy transfer dynamics in core-only and core/shell InP QDs.
  • Developed InP/ZnSe/ZnS core/shell QDs with surface-anchored anthracene acceptors.
  • Measured triplet-triplet annihilation and photon upconversion efficiency.

Main Results:

  • Identified picosecond hole trapping in core-only InP QDs, potentially hindering energy transfer.
  • Engineered core/shell InP QDs that effectively suppressed hole trapping.
  • Achieved 84% triplet energy transfer efficiency to anthracene acceptors.
  • Demonstrated photon upconversion with a normalized quantum yield of 10.0% ± 0.1%.

Conclusions:

  • Nontoxic InP-based core/shell QDs can be effectively engineered for triplet sensitization.
  • These green QDs demonstrate performance comparable to traditional Cd- or Pb-containing QDs.
  • This work paves the way for environmentally friendly photochemical and photonic applications using quantum dots.