Singlet fission is a spin-allowed process, unique to molecular photophysics, whereby one singlet excited state is converted into two triplet states. The phenomenon has been observed in molecular crystals, aggregates, disordered thin films, and covalently-linked dimers, where the chromophores are oriented such that the electronic coupling between singlet and the double triplet states is large. Being spin allowed, the process can occur very rapidly (on a picosecond or femtosecond timescale) and out-compete radiative decay (that generally occurs on a nanosecond timescale) thereby producing two triplets with very high efficiency. The process is distinct from intersystem crossing, in that singlet fission does not involve a spin flip, but is mediated by two triplets coupled into an overall singlet.[1] It has been proposed that singlet fission in organic photovoltaic devices could improve the photoconversion efficiencies.[2]
^Smith, Millicent B.; Michl, Josef (2010). "Singlet Fission". Chemical Reviews. 110 (11): 6891–936. doi:10.1021/cr1002613. PMID 21053979.
^"Proceedings of the Twenty-Seventh DOE Solar Photochemistry Research Conference" (PDF). Archived from the original (PDF) on 12 June 2018.
Singletfission is a spin-allowed process, unique to molecular photophysics, whereby one singlet excited state is converted into two triplet states. The...
up singlet in Wiktionary, the free dictionary. Singlet may refer to: singlet state, in theoretical physics, a quantum state with zero spin Singlet fission...
Buckup (2024). "Charge-transfer states at metal–organic interface limit singletfission yields: a photonically enhanced pump–probe study". Journal of Physical...
as ionic fission. The singlet excitation energy of a sigma bond is the energy required for heterolytic dissociation, but the actual singlet excitation...
produce lower-energy excitations in solar cells in a process known as singletfission. An interface layer between tetracene and silicon transfers them into...
chemistry, cyclic(alkyl)(amino)carbenes (CAACs) are a family of stable singlet carbene ligands developed by the research group of Guy Bertrand in 2005...
likely to undergo singletfission than when they are tilted. The work was the first to show that pentacene could undergo singletfission at room temperature...
of multiple exciton generation. The latter process was compared to singletfission in molecular crystals. In collaboration with experimentalists, Prezhdo...
state of isospin called singlet, or in a symmetric state called triplet. In terms of the "down" state and "up" state, the singlet is 1 2 ( | ↑↓ ⟩ − | ↓↑...
identical nuclei fissioning. As the atomic number increases, spontaneous fission rapidly becomes more important: spontaneous fission partial half-lives...
around 100 picoseconds) before decaying as heat. In singletfission materials, Huang identified singlet-mediate triplet transport mechanisms, which can cause...
framework would require an additional right-chiral component which is an SU(2) singlet. This component would have the conventional Yukawa interactions with the...
flavonoids, their antioxidant potential is low. The ability to quench singlet oxygen seems to be in relation with the chemical structure of catechin...
additionally been observed in organic pentacene derivatives through singlet exciton fission with extremely high quantum efficiency. Timmerman, D.; Izeddin...
characteristic arrangement, with nine fused pairs surrounding two central singlets. These arise from a basal body. In some flagellates, flagella direct food...
either 2 (d-boson) or 0 (s-boson). They correspond to a quintuplet and singlet, i.e. 6 states. It is sometimes known as the Interacting boson approximation...
Gaseous molybdenum consists of the diatomic species Mo2. That molecule is a singlet, with two unpaired electrons in bonding orbitals, in addition to 5 conventional...
so-called -molecular orbitals. The ground state S0 is a singlet state above which are the excited singlet states (S*, S**, ...), the lowest triplet state (T0)...
phloxine B is subjected to light, debromination occurs and free radicals and singlet oxygen are formed. These compounds cause irreversible damage to the bacteria...
315 μm (<70% atmospheric transmittance) Chemical reaction in a jet of singlet delta oxygen and iodine Military lasers, scientific and materials research...
neutrinos and right-handed antineutrinos? Such particles would belong to a singlet representation with respect to the strong interaction and the weak interaction...
In an even more specific context, this can also name the non-radical singlet ground state, whereas the diradical state is named trioxidanediyl. Trioxidanediyl...
; in the parahydrogen form the spins are antiparallel and form a spin singlet state having spin S = 0 {\displaystyle S=0} . The equilibrium ratio of...
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