Efficient singlet fission in nanoparticles of amphipathic anthracene–tetracene dyad with broadband light harvesting ability. Issue 5 (19th January 2022)

• Record Type: Journal Article
• Authors: Nie, Xinyu; Liu, Heyuan; Wang, Weijie; Su, Pengkun; Zhou, Jun; Li, Zhi; Liu, Zhaobin; Tang, Zhaofeng; Chen, Yanli; Li, Xiyou
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 5(2022)
• Page Start: 1878
• Page End: 1886
• Publication Date: 2022-01-19
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1tc05316g
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : An efficient SF material with broadband light harvesting ability was prepared by means of ultrafast intramolecular Förster resonance energy transfer. 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 ( Φ T1 = ∼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 x SF materials with broadband light harvesting ability.