Full-Spectrum InP-Based Quantum Dots with Near-Unity Photoluminescence Quantum Efficiency

Van Avermaet H, Schiettecatte P, Hinz S, Giordano L, Ferrari F, Nayral C, Delpech F, Maultzsch J, Lange H, Hens Z (2022)

Publication Type: Journal article

Publication year: 2022

Journal

ACS nano American Chemical Society

DOI: 10.1021/acsnano.2c03138

Abstract

Photoluminescent color conversion by quantum dots (QDs) makes possible the formation of spectrum-ondemand light sources by combining blue LEDs with the light generated by a specific blend of QDs. Such applications, however, require a near-unity photoluminescence quantum efficiency since self-absorption magnifies disproportionally the impact of photon losses on the overall conversion efficiency. Here, we present a synthesis protocol for forming InP-based QDs with +90% quantum efficiency across the full visible spectrum from blue/cyan to red. The central features of our approach are as follows: (1) the formation of InP core QDs through one-batch-one-size reactions based on aminophosphine as the phosphorus precursor, (2) the introduction of a core/ shell/shell InP/Zn(Se,S)/ZnS structure, and (3) the use of specific interfacial treatments, most notably the saturation of the ZnSe surface with zinc acetate prior to ZnS shell growth. Moreover, we adapted the composition of the Zn(Se,S) inner shell to attain the intended emission color while minimizing line broadening induced by the InP/ZnS lattice mismatch. The protocol is established by analysis of the QD composition and structure using multiple techniques, including solid-state nuclear magnetic resonance spectroscopy and Raman spectroscopy, and verified for reproducibility by having different researchers execute the same protocol. The realization of full-spectrum, +90% quantum efficiency will strongly facilitate research into light-matter interaction in general and luminescent color conversion in particular through InP-based QDs.

Authors with CRIS profile

Janina Maultzsch Lehrstuhl für Experimentalphysik

Involved external institutions

Universiteit Gent (UGent) / Ghent University BE Belgium (BE) Universität Hamburg (UHH) DE Germany (DE) Université Fédérale de Toulouse Midi-Pyrénées FR France (FR)

How to cite

APA:

Van Avermaet, H., Schiettecatte, P., Hinz, S., Giordano, L., Ferrari, F., Nayral, C.,... Hens, Z. (2022). Full-Spectrum InP-Based Quantum Dots with Near-Unity Photoluminescence Quantum Efficiency. ACS nano. https://dx.doi.org/10.1021/acsnano.2c03138

MLA:

Van Avermaet, Hannes, et al. "Full-Spectrum InP-Based Quantum Dots with Near-Unity Photoluminescence Quantum Efficiency." ACS nano (2022).

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