Double-crowned 2D semiconductor nanoplatelets with bicolor power-tunable emission

Corentin Dabard, Victor Guilloux, Charlie Gréboval, Hong Po, Lina Makke, Ningyuan Fu, Xiang Zhen Xu, Mathieu G. Silly, Gilles Patriarche, Emmanuel Lhuillier, Thierry Barisien, Juan I. Climente, Benjamin T. Diroll and Sandrine Ithurria ()
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Corentin Dabard: PSL Research University, Sorbonne Université Univ Paris 06
Victor Guilloux: Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP
Charlie Gréboval: Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP
Hong Po: PSL Research University, Sorbonne Université Univ Paris 06
Lina Makke: PSL Research University, Sorbonne Université Univ Paris 06
Ningyuan Fu: PSL Research University, Sorbonne Université Univ Paris 06
Xiang Zhen Xu: PSL Research University, Sorbonne Université Univ Paris 06
Mathieu G. Silly: L’Orme des Merisiers, Départementale 128
Gilles Patriarche: Université Paris-Saclay, C2N
Emmanuel Lhuillier: Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP
Thierry Barisien: Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP
Juan I. Climente: Universitat Jaume I
Benjamin T. Diroll: Argonne National Laboratory
Sandrine Ithurria: PSL Research University, Sorbonne Université Univ Paris 06

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Nanocrystals (NCs) are now established building blocks for optoelectronics and their use as down converters for large gamut displays has been their first mass market. NC integration relies on a combination of green and red NCs into a blend, which rises post-growth formulation issues. A careful engineering of the NCs may enable dual emissions from a single NC population which violates Kasha’s rule, which stipulates that emission should occur at the band edge. Thus, in addition to an attentive control of band alignment to obtain green and red signals, non-radiative decay paths also have to be carefully slowed down to enable emission away from the ground state. Here, we demonstrate that core/crown/crown 2D nanoplatelets (NPLs), made of CdSe/CdTe/CdSe, can combine a large volume and a type-II band alignment enabling simultaneously red and narrow green emissions. Moreover, we demonstrate that the ratio of the two emissions can be tuned by the incident power, which results in a saturation of the red emission due to non-radiative Auger recombination that affects this emission much stronger than the green one. Finally, we also show that dual-color, power tunable, emission can be obtained through an electrical excitation.

Date: 2022
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DOI: 10.1038/s41467-022-32713-2

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