Hybrid nanomaterials for triplet fusion upconversion

Mark W. B. Wilson

doi:10.1117/12.2569019

21 August 2020 Hybrid nanomaterials for triplet fusion upconversion

Mark W. B. Wilson

Proceedings Volume 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX; 1146417 (2020) https://doi.org/10.1117/12.2569019
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

The ability to efficiently up-convert broadband, low-intensity infrared light to the visible would be an enabling technology for 3rd-generation photovoltaics, biological imaging, and sensitizing silicon focal plane arrays. Our approach uses PbS colloidal quantum dots to absorb infrared photons and sensitize the long-lived spin-triplet excited states of nearby semiconducting molecules, where excitations can combine via triplet fusion to create visible light emission. However, there is more to be done. For instance, energetic disorder in films of size-disperse quantum dots presently hinders transport and hampers low-intensity performance. Here, I will show that process additives can control a cluster intermediate in the synthesis of PbS quantum dots, yielding markedly narrower ensemble linewidths. Then, I will discuss why recent photophysical experiments on a novel molecular dimer suggest that the spin-statistical efficiency limit on fusion can be lifted from 25% to 66% in solution.

Conference Presentation

Citation Download Citation

Mark W. B. Wilson "Hybrid nanomaterials for triplet fusion upconversion", Proc. SPIE 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX, 1146417 (21 August 2020); https://doi.org/10.1117/12.2569019

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