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Optimizing photon upconversion by decoupling excimer formation and triplet triplet annihilation

Journal article
Authors Chen Ye
V. Gray
Khushbu Kushwaha
S. Kumar Singh
P. Erhart
Karl Börjesson
Published in Physical Chemistry Chemical Physics
Volume 22
Issue 3
Pages 1715-1720
ISSN 1463-9076
Publication year 2020
Published at Department of Chemistry and Molecular Biology
Pages 1715-1720
Language en
Keywords subsolar irradiance, singlet fission, solar-cell, anthracene, light, luminescence, nanocapsules, derivatives, efficiency, perylene, Chemistry, Physics
Subject categories Chemical Sciences


Perylene is a promising annihilator candidate for triplet-triplet annihilation photon upconversion, which has been successfully used in solar cells and in photocatalysis. Perylene can, however, form excimers, reducing the energy conversion efficiency and hindering further development of TTA-UC systems. Alkyl substitution of perylene can suppress excimer formation, but decelerate triplet energy transfer and triplet-triplet annihilation at the same time. Our results show that mono-substitution with small alkyl groups selectively blocks excimer formation without severly compromising the TTA-UC efficiency. The experimental results are complemented by DFT calculations, which demonstrate that excimer formation is suppressed by steric repulsion. The results demonstrate how the chemical structure can be modified to block unwanted intermolecular excited state relaxation pathways with minimal effect on the preferred ones.

Page Manager: Webmaster|Last update: 9/11/2012

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