Issue 5, 2022

Efficient singlet fission in nanoparticles of amphipathic anthracene–tetracene dyad with broadband light harvesting ability

Abstract

Efficient singlet fission (SF) materials with relatively high triplet state energy and broadband light harvesting ability simultaneously have a greater advantage for practical application in photovoltaics. Herein, we prepared colloid nanoparticles of an amphipathic anthracene (DPA)–tetracene (DPT) dyad (DPT–DPA–COOH) with broadband light harvesting. The DPA unit compensates the weak absorption of the DPT unit at shorter than 425 nm wavelength via ultrafast (< 1 ps) and quantitative intramolecular singlet Förster resonance energy transfer (FRET) from the DPA unit to the DPT unit. Transient absorption spectroscopy demonstrated that a fast (∼73 ps) and efficient (ΦT1 = ∼110%) intermolecular SF (xSF) between the adjacent DPT units of the DPT–DPA–COOH molecule in nanoparticles could be initiated by the near-unity intramolecular FRET. The close arrangement between the DPT units enforced by the extra hydrophilic interaction induced by the carboxyl group is the key for achieving efficient xSF. These results suggest that the link of proper singlet energy donor (antennas) to the SF chromophore via covalent bond is a good option for designing xSF materials with broadband light harvesting ability.

Graphical abstract: Efficient singlet fission in nanoparticles of amphipathic anthracene–tetracene dyad with broadband light harvesting ability

Supplementary files

Article information

Article type
Paper
Submitted
03 Nov 2021
Accepted
04 Jan 2022
First published
06 Jan 2022

J. Mater. Chem. C, 2022,10, 1878-1886

Efficient singlet fission in nanoparticles of amphipathic anthracene–tetracene dyad with broadband light harvesting ability

X. Nie, H. Liu, W. Wang, P. Su, J. Zhou, Z. Li, Z. Liu, Z. Tang, Y. Chen and X. Li, J. Mater. Chem. C, 2022, 10, 1878 DOI: 10.1039/D1TC05316G

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