Near-Unity Emitting, Widely Tailorable, and Stable Exciton Concentrators Built from Doubly Gradient 2D Semiconductor Nanoplatelets

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Near-Unity Emitting, Widely Tailorable, and Stable Exciton Concentrators Built from Doubly Gradient 2D Semiconductor Nanoplatelets
Title:
Near-Unity Emitting, Widely Tailorable, and Stable Exciton Concentrators Built from Doubly Gradient 2D Semiconductor Nanoplatelets
Journal Title:
ACS Nano
Keywords:
Publication Date:
23 August 2023
Citation:
Liang, X., Durmusoglu, E. G., Lunina, M., Hernandez-Martinez, P. L., Valuckas, V., Yan, F., Lekina, Y., Sharma, V. K., Yin, T., Ha, S. T., Shen, Z. X., Sun, H., Kuznetsov, A., & Demir, H. V. (2023). Near-Unity Emitting, Widely Tailorable, and Stable Exciton Concentrators Built from Doubly Gradient 2D Semiconductor Nanoplatelets. ACS Nano, 17(20), 19981–19992. https://doi.org/10.1021/acsnano.3c05125
Abstract:
The electrostatic interactions (EI) between electrons and holes within semiconductor nanocrystals (NCs) profoundly impact the performance of their optoelectronic systems. However, achieving a broad range, fine-tuning of the EI strength, especially in quasi-2 dimensional core-shell semiconductor NCs, is a daunting challenge, as the shell growth for high efficiency and stability largely compromises the strength of EI. Herein we propose and demonstrate a novel doubly-gradient (DG) core-shell architecture of semiconductor nanoplatelets (NPLs) for on-demand tailoring of the EI strength by controlling the localized exciton concentration via in-plane architectural modulation, demonstrated by a wide tuning of exciton binding energy. Moreover, these exciton-concentration-engineered DG NPLs also exhibit a near-unity quantum yield, remarkable thermal and photo stability, as well as considerably suppressed self-absorption. As proof-of-concept demonstrations, highly efficient color converters and high-performance LEDs (external quantum efficiency:16.9%, maximum luminance: 43,000 cd/m2) have been achieved based on the DG NPLs. This work thus opens up new avenues for developing high-performance colloidal optoelectronic device applications.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the A*STAR - MTC Programatic
Grant Reference no. : M21J9b0085

This research / project is supported by the Ministry of Education - Academic Research Fund Tier 1
Grant Reference no. : MOE-RG62/20

This research / project is supported by the Ministry of Education - Tier 1
Grant Reference no. : MOE-RG57/21

This research / project is supported by the Ministry of Education - Tier 2
Grant Reference no. : MOE-T2EP50220-0020

This research / project is supported by the Ministry of Education - Tier 2
Grant Reference no. : MOE-T2EP50122-0005

This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP23-2019-0007

This research / project is supported by the Ministry of Education - Tier 1
Grant Reference no. : MOE-RG139/22
Description:
ISSN:
1936-086X
1936-0851