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5 October 2023 Controlling energy flow to improve solid-state triplet-triplet annihilation upconversion
Pournima Narayanan, Emma Belliveau, Manchen Hu, Ghada Ahmed, Vongaishe Mutatu, Qi Zhou, Dan Congreve
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Proceedings Volume PC12650, Physical Chemistry of Semiconductor Materials and Interfaces XXII; PC126500S (2023) https://doi.org/10.1117/12.2675951
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
Upconversion (UC) of NIR photons into visible photons can improve photovoltaics technologies and enable passive night vision. However, current solid-state triplet-triplet annihilation UC devices suffer from low absorption, low energy transfer rates, and highly parasitic back transfer processes which lead to low external quantum efficiencies (EQE). We propose the introduction of a “blocker layer” which can mitigate FRET-based back transfer to improve the EQE. We demonstrate the use of 5-tetracene carboxylic acid (TCA) as a ligand/blocker layer to improve EQE by 3-5x. Finally, we deconvolve the mechanism of improvement through spectroscopic comparison of the traditional and our novel UC devices.
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Pournima Narayanan, Emma Belliveau, Manchen Hu, Ghada Ahmed, Vongaishe Mutatu, Qi Zhou, and Dan Congreve "Controlling energy flow to improve solid-state triplet-triplet annihilation upconversion", Proc. SPIE PC12650, Physical Chemistry of Semiconductor Materials and Interfaces XXII, PC126500S (5 October 2023); https://doi.org/10.1117/12.2675951
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KEYWORDS
Upconversion
Photons
External quantum efficiency
Solid state physics
Energy transfer
Night vision
Photovoltaics
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