نتایج جستجو برای: singlet triplet energy gaps
تعداد نتایج: 733339 فیلتر نتایج به سال:
We synthesized a series of purely organic phosphors, bromobenzaldehyde derivatives, with varying conjugation length to investigate the effects of conjugation length on their phosphorescence emission properties. As the conjugation length increases phosphorescence efficiency decreases with a redshift in the emission color at 77 K. Our computational results imply that this correlation is related t...
Computed singlet ground-state and low-lying singlet and triplet excited-state potential energy surfaces of 2,3-diazabicyclo[2.2.2]oct-2-ene (DBO) and 2,3-diazabicyclo[2.2.1]hept-2-ene (DBH) are combined with experimental facts and reasonable models for how excess energy is partitioned among internal and solvent modes to propose mechanisms for the title reactions. In particular, we put forth a m...
The ground state, singlet! singlet and singlet! triplet vertical excited states of styrene have been studied by using the symmetry adapted cluster-configuration interaction (SAC-CI) method with aug-cc-pVDZ basis sets supplemented with molecule-centered Rydberg functions. The characteristic structures of the bands observed in the vacuum ultraviolet (VUV) and electron energy loss (EEL) spectra ha...
Entanglement of states is one of the most surprising and counter-intuitive consequences of quantum mechanics, with potent applications in cryptography and computing. In organic materials, one particularly significant manifestation is the spin-entangled triplet-pair state, which mediates the spin-conserving fission of one spin-0 singlet exciton into two spin-1 triplet excitons. Despite long theo...
A new strategy to realize efficient white-light emission from a binary fluorene-based copolymer (PF-Phq) with the fluorene segment as a blue emitter and the iridium complex, 9-iridium(III)bis(2-(2-phenyl-quinoline-N,C30)(11,13-tetradecanedionate))-3,6-carbazole (Phq), as a red emitter has been proposed and demonstrated. The photoand electroluminescence properties of the PF-Phq copolymers were i...
We report a systematic study of the photophysical parameters relevant to photodynamic therapy (PDT) by a new type of sensitizers, conjugated porphyrin oligomers. Due to the strong nonlinear properties of oligomers containing 2, 4 and 8 porphyrin units, these molecules are attractive candidates for PDT via multiphoton excitation. The triplet state energy levels for all molecules have been determ...
Acid-switching of the triplet excited state in rhodamine-C60 dyads was achieved. The rhodamine moiety acts as an acid-activated visible light-harvesting antenna and C60 as the singlet energy acceptor and the spin converter, and production of the triplet state was enhanced in the presence of acid.
The experimental data on triplet exciton transport in isotopically mixed crystals of naphthalene/ perdeuteronaphthalene (paper I) are contrasted with singlet exciton transport in the same samples (20%-100%) and analyzed in terms of incoherent hopping models. The master equation approach is emphasized and extended. We modify the conventional continuum master equations via a physically plausible ...
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