Intramolecular Singlet Fission in Oligoacene Heterodimers
作者:Samuel N. Sanders、Elango Kumarasamy、Andrew B. Pun、Michael L. Steigerwald、Matthew Y. Sfeir、Luis M. Campos
DOI:10.1002/anie.201510632
日期:2016.3.1
We investigate singletfission (SF) in heterodimers comprising a pentacene unit covalently bonded to another acene as we systematically vary the singlet and triplet pair energies. We find that these energies control the SF process, where dimers undergo SF provided that the resulting triplet pair energy is similar or lower in energy than the singlet state. In these systems the singlet energy is determined
[EN] QUANTITATIVE INTRAMOLECULAR FISSION IN OLIGOACENES, MATERIALS, AND METHODS OF USE THEREOF<br/>[FR] FRAGMENTATION INTRAMOLÉCULAIRE QUANTITATIVE DANS DES OLIGOACÈNES, MATÉRIAUX, ET LEURS PROCÉDÉS D'UTILISATION
申请人:UNIV COLUMBIA
公开号:WO2016100754A1
公开(公告)日:2016-06-23
The present invention provides soluble, stable singlet fission (SF) compounds, compositions, materials, methods of their use, and methods for their preparation that provide efficient intramolecular singlet fission (iSF) and multiple excitons. The SF compound may be a dimer, an oligomer, or a polymer of polyoligoacenes, where for example, the compound achieves a triplet yield reaching about 200% per absorbed photon. In this system, SF does not depend on intermolecular inter-actions. Instead, SF is an intrinsic property of the molecule and therefore occurs independent of intermolecular interactions. Singlet fission has the potential to significantly improve the photocurrent in single junction solar cells and thus raise the Shockley-Queisser power conversion efficiency limit from about 33% to about 46% or greater. Quantitative SF yield at room temperature has only been observed in crystalline solids or aggregates of higher acenes.
Molecular Engineering of Chromophores to Enable Triplet–Triplet Annihilation Upconversion
作者:Kealan J. Fallon、Emily M. Churchill、Samuel N. Sanders、James Shee、John L. Weber、Rinat Meir、Steffen Jockusch、David R. Reichman、Matthew Y. Sfeir、Daniel N. Congreve、Luis M. Campos
DOI:10.1021/jacs.0c06386
日期:2020.11.25
report up to 40-fold improvements in upconversion quantum yields using molecularengineering to selectively tailor the relative energies of the lowest singlet and triplet excited states, enhancing the yield of triplet-triplet annihilation and promoting radiative decay of the resulting singlet exciton. Using this general and effective strategy, we obtain upconversion yields with red emission that are among