A photophysical process. An isoenergetic non-radiative transition between two electronic states having different multiplicities. It often results in a vibrationally excited molecular entity in the lower electronic state, which then usually deactivates to its lowest vibrational level. Electronic state is a quantum state of a system consisting of electrons (usually orbitals or chemical bonds in crystals or molecules). ... In quantum mechanics, the term symbol is an abbreviated description of the angular momentum quantum numbers in a multi-electron atom. ... Accordig to IUPAC Gold Book[1] a molecular entity is any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer, etc. ... A vibrational transition is an abrupt change in vibrational energy in quantum physics. ...
wherein the heterostructure comprises an intersystemcrossing molecule such that the efficiency of the emission is enhanced by the use of the intersystemcrossing molecule.
The device of claim 12 wherein the emissive molecule is fluorescent and the intersystemcrossing agent is an organometallic compound comprising a metal of the third row of the periodic table.
It is preferred that the emissive molecule and the intersystemcrossing molecule be different and it is preferred that there be substantial spectral overlap between the emissive molecule and the intersystemcrossing molecule.
The kinetics of internal conversion and intersystemcrossing of xanthone in solution are measured using femtosecond pump-probe techniques.
The intersystemcrossing rates from the ^1 \pi \pi^* and ^1 n \pi^* electronic states are consistent with an "inverse" gap effect where the rate constants increase as the singlet-triplet energy gap increases.
The branching between intersystemcrossing from the ^1 \pi \pi^* and ^1 n \pi^* electronic states is also highly solvent dependent and is determined by the rate of internal conversion in the singlet electronic state.
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