Design of small intramolecular singlet fission chromophores: an azaborine candidate and general small size effects. Exciton fission and fusion in bis(tetracene) molecules with different covalent linker structures. Evidence for exciton fission and fusion in a covalently linked tetracene dimer. Correlating structure and function in organic electronics: from single molecule transport to singlet fission. Singlet exciton fission for solar cell applications: energy aspects of interchromophore coupling. Covalent dimers of 1,3-Diphenylisobenzofuran for singlet fission: synthesis and electrochemistry. A design strategy for intramolecular singlet fission mediated by charge-transfer states in donor–acceptor organic materials. Activated singlet exciton fission in a semiconducting polymer. Quantum beats in crystalline tetracene delayed fluorescence due to triplet pair coherences produced by direct singlet fission. Identification of a triplet pair intermediate in singlet exciton fission in solution.
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Morphological evolution and singlet fission in aqueous suspensions of TIPS-pentacene nanoparticles. Exciton delocalization drives rapid singlet fission in nanoparticles of acene derivatives. Polymorphism influences singlet fission rates in tetracene thin films. How morphology affects singlet fission in crystalline tetracene. Effect of magnetic field on fluorescence of tetracene crystals-exciton fission. Singlet exciton fission and triplet–triplet exciton fusion in crystalline tetracene. Temperature-independent singlet exciton fission in tetracene. Excited state dynamics in solid and monomeric tetracene: the roles of superradiance and exciton fission. The dependence of singlet exciton relaxation on excitation density and temperature in polycrystalline tetracene thin films: kinetic evidence for a dark intermediate state and implications for singlet fission. The exciton dynamics in tetracene thin films. Spectroscopic approach to energetics of exciton fission and fusion in tetracene crystals. Solar conversion efficiency of photovoltaic and photoelectrolysis cells with carrier multiplication absorbers. Beyond Shockley–Queisser: molecular approaches to high-efficiency photovoltaics. We compare two different pentacene–bridge–pentacene chromophores, systematically tuning the coupling between the pentacenes to understand how differences in molecular structure affect the population and dissociation of multiexciton quintet states.
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Furthermore, we confirm long-standing predictions that singlet fission produces triplet pair states of quintet character. We combine transient absorption and time-resolved electron spin resonance spectroscopies to show that spin correlations in the multiexciton state persist for hundreds of nanoseconds. Here, we use bridged pentacene dimers, which undergo intramolecular singlet fission while isolated in solution and in solid matrices, as a unimolecular model system that can trap long-lived multiexciton states.
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However, little is known about electronic and spin correlations in these systems since, due to its typically short lifetime, the multiexciton state is challenging to isolate and study.
Bruker epr no signal after tuning free#
Conservation of angular momentum requires that singlet fission populates correlated multiexciton states, which can subsequently dissociate to generate free triplets. Singlet fission, in which two triplet excitons are generated from a single absorbed photon, is a key third-generation solar cell concept.