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Issue 18, 2020
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Triplet–triplet annihilation based near infrared to visible molecular photon upconversion

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Abstract

Triplet–triplet annihilation based molecular photon upconversion (TTA-UC) is an exciting research area for a broad range of photonic applications due to its tunable spectral range and possible operation at non-coherent solar irradiance. Most of the TTA-UC studies are limited to Visible to Visible (Vis to Vis) energy upconversion. However, for several practical photonic applications, efficient near infrared (NIR) to Vis upconversion is preferred. Examples include, (i) photovoltaics where TTA-UC could lead to utilization of a larger part of the solar spectrum and (ii) in NIR stimulated biological applications where the deep penetration and non-invasive nature of NIR light coupled to TTA-UC offers new opportunities. Although, NIR to Vis TTA-UC is known since 2007, the recent five years have witnessed quite a progress in terms of the development of new chromophores, hybrid systems and fabrication techniques to increase the UC quantum yield at low excitation intensity. With this tutorial review we are reviewing recent progress, identifying existing challenges and discus possible future directions and opportunities.

Graphical abstract: Triplet–triplet annihilation based near infrared to visible molecular photon upconversion

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Article information


Submitted
23 Jun 2020
First published
03 Sep 2020

This article is Open Access

Chem. Soc. Rev., 2020,49, 6529-6554
Article type
Tutorial Review

Triplet–triplet annihilation based near infrared to visible molecular photon upconversion

P. Bharmoria, H. Bildirir and K. Moth-Poulsen, Chem. Soc. Rev., 2020, 49, 6529 DOI: 10.1039/D0CS00257G

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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