Strategy for Ultranarrow Light Down-Conversion for Displays Based on Bicolor-Emitting 2D Colloidal Heterostructures
The demand for ultranarrow spectral emission below 10 nm is critical for next-generation displays. Although current colloidal nanocrystals are successful in light down-conversion applications, they fall short in matching the stringent color purity requirements set by standards like Rec. 2020. Achieving such narrow linewidths through material engineering alone remains elusive, necessitating innovative light management strategies that avoid optical losses and maintain device efficiency. Here, we present a novel 2D colloidal heterostructure design, combining a CdSe core nanoplatelet, a CdS crown, and a CdZnS shell, to achieve bright bicolor emission in the solid state (green/red) emission with tunable intensity ratios controlled by excitation power (either optical or electrical). Integration of these nanoplatelets into a dielectric cavity further narrows the emission linewidth to sub-2 nm while enhancing the photoluminescence intensity by up to 200 times, meeting the Rec. 2020 color purity targets. This approach paves the way for a strategy avoiding complex laser-based solutions.
Authors
- Nicolas Menguy
- Mariarosa Cavallo (ORCID: https://orcid.org/0000-0002-8768-5545)
- Marc Paye
- Emmanuel Lhuillier (ORCID: https://orcid.org/0000-0003-2582-1422)
- Mathieu G. Silly (ORCID: https://orcid.org/0000-0002-0302-8442)
- Debora Pierucci (ORCID: https://orcid.org/0000-0001-8751-1994)
- Dario Mastrippolito (ORCID: https://orcid.org/0000-0001-6360-7254)
- Sandrine Ithurria (ORCID: https://orcid.org/0000-0002-4733-9883)
- Clément Gureghian
- Jiho Roh (ORCID: https://orcid.org/0009-0003-9738-2008)
- Jisoo Oh
- Benjamin T. Diroll
- Thomas E. Gage
- Xavier Lafosse
- Juan I. Climente
- Xiang Zhen Xu
Institutions
- Universitat Jaume I (ES)
- Argonne National Laboratory (US)
- Centre National de la Recherche Scientifique (FR)
- Université Paris Sciences et Lettres (FR)
- Université Paris-Saclay (FR)
- Synchrotron soleil (FR)
- Sorbonne Université (FR)
- Laboratoire de Physique et d’Étude des Matériaux (FR)
- Centre de Nanosciences et de Nanotechnologies (FR)
- Institut des NanoSciences de Paris (FR)
- Institut de minéralogie, de physique des matériaux et de cosmochimie (FR)
- Instituto de Química y Fisicoquímica Biológicas (AR)
- Center for Nanoscale Materials
Publication Details
- Journal
- Nano Letters
- Published
- 2026-06-16
- DOI
- https://doi.org/10.1021/acs.nanolett.6c01589
- Primary Topic
- Photonic Crystals and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Agence Nationale de la Recherche
- European Research Council