April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)

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2024 MRS Spring Meeting
EL02.09.10

Acceleration of Near-IR Emission through Efficient Surface Passivation and Doping of Cd3P2 Quantum Dots

When and Where

Apr 26, 2024
11:45am - 12:00pm
Room 347, Level 3, Summit

Presenter(s)

Co-Author(s)

Igor Fedin1,Logan Smith1,Kathryn Harbison1,Nickie Tiwari1,Benjamin Diroll2

The University of Alabama1,Argonne National Laboratory2

Abstract

Igor Fedin1,Logan Smith1,Kathryn Harbison1,Nickie Tiwari1,Benjamin Diroll2

The University of Alabama1,Argonne National Laboratory2
Fast near-IR (NIR) emitters are highly valuable in telecommunications and biological imaging. Colloidal synthesis is a potent method that produces a few NIR-emitting materials, but they suffer from long photoluminescence (PL) times. These long PL times are intrinsic in some NIR materials (PbS, PbSe) but are attributed to emission from bright trapped carrier states in others. We develop the colloidal chemistry of an overlooked II–V semiconductor cadmium phosphide (Cd<sub>3</sub>P<sub>2</sub>) — an alternative promising near-IR material that offers a high bandgap tunability. It is a unique material that bridges III–V and II–VI semiconductors and combines the best of both worlds: near-IR emission with solution processability. We show that as-synthesized Cd<sub>3</sub>P<sub>2</sub> QDs possess substantial trap emission with radiative times &gt;10<sup>1</sup> ns. With the help of intelligent surface passivation through shell growth or Lewis coordination, or through cationic doping, we manage to accelerate the NIR emission from Cd<sub>3</sub>P<sub>2</sub> QDs by decreasing the amount of trap emission. This finding brings us one step closer to the application of colloidally synthesized QDs as quantum emitters.

Keywords

surface reaction

Symposium Organizers

Yunping Huang, CU Boulder
Hao Nguyen, University of Washington
Nayon Park, University of Washington
Claudia Pereyra, University of Pennsylvania

Session Chairs

Hao Nguyen
Gillian Shen

In this Session