Spectroelectrochemistry of CdSe/CdxZn1−xS Nanoplatelets

A Ashokan; J Han; JA Hutchison; P Mulvaney

Journal article

Spectroelectrochemistry of CdSe/CdxZn1−xS Nanoplatelets

A Ashokan, J Han, JA Hutchison, P Mulvaney

ACS Nano | AMER CHEMICAL SOC | Published : 2023

DOI: 10.1021/acsnano.2c09298

Download PDF

Abstract

We report an unexpected enhancement of photoluminescence (PL) in CdSe-based core/shell nanoplatelets (NPLs) upon electrochemical hole injection. Moderate hole doping densities induce an enhancement of more than 50% in PL intensity. This is accompanied by a narrowing and blue-shift of the PL spectrum. Simultaneous, time-resolved PL experiments reveal a slower luminescence decay. Such hole-induced PL brightening in NPLs is in stark contrast to the usual observation of PL quenching of CdSe-based quantum dots following hole injection. We propose that hole injection removes surface traps responsible for the formation of negative trions, thereby blocking nonradiative Auger processes. Continuous ph..

View full abstract

University of Melbourne Researchers

James Hutchison Author

Paul Mulvaney Author

Related Projects (1)

Beyond the exciton: Shaping molecular energy landscapes using polaritons

This project aims to deliver a fundamental understanding of polariton-mediated light and heat energy transfer in molecular systems, paving t..

Grants

Awarded by University of Melbourne

Funding Acknowledgements

The authors thank the Australian Research Council (ARC) for support through CE170100026. J.A.H. acknowledges an ARC Future Fellowship award (FT180100295) . A.A thanks the University of Melbourne for a Melbourne Research Scholarship. Electron microscopy was carried out at the Ian Holmes Imaging Centre.