Integration of Multiple-Photon Excitation of Quantum Dots and Singlet Fission of Pentacene Dimers in Inorganic and Organic Hybrid Systems

IF 5.2 3区工程技术 Q2 ENERGY & FUELS

Energy & Fuels Pub Date : 2025-04-01 DOI:10.1021/acs.energyfuels.4c0621810.1021/acs.energyfuels.4c06218

Toshiyuki Saegusa, Hayato Sakai*, Nikolai V. Tkachenko* and Taku Hasobe*,

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引用次数: 0

Abstract

Singlet fission (SF) is a spin-allowed multiexciton generation (MEG) process, where one singlet exciton (S₁) splits into two triplet excitons (2T₁) in two nearby molecules (theoretical maximum triplet quantum yield: 2). In contrast, bi- and multiexciton states of quantum dots (QDs) have been generated by exciting them at high excitation density (multiple-photon excitation). Here, we propose combining these materials for the integrated MEG (iMEG) process using 6,13-bis(triisopropylsilylethynyl)pentacene (TP) dimer [(TP)₂]-modified CdSe QD (CdSeQD) hybrids. Upon photoexcitation of CdSeQD with multiple-photon excitation, a sequential photoinduced process from the multiexciton state (CdSeQD) to SF [(TP)₂] occurred through singlet–singlet energy transfer (EnT) from CdSeQD to TP. The number of triplet excitons generated per CdSeQD (N_T) increased up to ∼4.9 ± 0.7 at higher excitation intensities. Our proposed inorganic–organic hybrid system demonstrates a novel exciton amplification process for various future uses, such as solar energy conversion, optoelectronics, and biological applications.

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来源期刊

Energy & Fuels 工程技术-工程：化工

CiteScore

9.20

自引率

13.20%

发文量

1101

审稿时长

2.1 months

期刊介绍： Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.