Dual-Resonance Nanostructures for Color Downconversion of Colloidal Quantum Emitters

Dual-Resonance Nanostructures for Color Downconversion of Colloidal Quantum Emitters

Nano Letters

10.1021/acs.nanolett.3c03786

http://dx.doi.org/10.1021/acs.nanolett.3c03786

Son Tung Ha, Emmanuel Lassalle, Xiao Liang, Thi Thu Ha Do, Ian Foo, Sushant Shendre, Emek G. Durmusoglu, Vytautas Valuckas, Sourav Adhikary, Ramón Paniagua-Domínguez, Hilmi Volkan Demir, Arseniy I. Kuznetsov

Mechanical Engineering, General Materials Science, General Chemistry, Condensed Matter Physics, Bioengineering

12 December 2023

Ha, S. T., Lassalle, E., Liang, X., Do, T. T. H., Foo, I., Shendre, S., Durmusoglu, E. G., Valuckas, V., Adhikary, S., Paniagua-Dominguez, R., Demir, H. V., & Kuznetsov, A. I. (2023). Dual-Resonance Nanostructures for Color Downconversion of Colloidal Quantum Emitters. Nano Letters, 23(24), 11802–11808. https://doi.org/10.1021/acs.nanolett.3c03786

We present a dual-resonance nanostructure made of a titanium dioxide (TiO2) subwavelength grating to enhance the color downconversion efficiency of Cd(x)Zn(1–x)Se(y)S(1–y) colloidal quantum dots (QDs) emitting at ∼530 nm when excited with a blue light at ∼460 nm. A large mode volume can be created within the QD layer by the hybridization of the grating resonances and waveguide modes, resulting in large absorption and emission enhancements. Particularly, we achieved polarized light emission with a maximum photoluminescence enhancement of ∼140 times at a specific angular direction and a total enhancement of ∼34 times within a 0.55 numerical aperture (NA) of the collecting objective. The enhancement encompasses absorption, Purcell and outcoupling enhancements. We achieved a total absorption of 35% for green QDs with a remarkably thin color conversion layer of ∼400 nm. This work provides a guideline for designing large-volume cavities for absorption/fluorescence enhancement in microLED display, detector, or photovoltaic applications.

Publisher Copyright

This research / project is supported by the A*STAR - MTC-Programmatic Grant
Grant Reference no. : M21J9b0085

This research / project is supported by the A*STAR - AME Young Individual Research Grant
Grant Reference no. : A2084c0177

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see doi.org/10.1021/acs.nanolett.3c03786

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