Excimer fluorescence and dimer phosphorescence from a naphthalene sandwich pair

Crystallization Induced Enhanced Emission in Two New Zn(II) and Cd(II) Supramolecular Coordination Complexes with the 1-(3,4-Dimethylphenyl)-5-Methyl-1H-1,2,3-Triazole-4-Carboxylate Ligand

“…Several strategies have been developed to overcome this inconvenience which severely limits the application in solid-state devices of many materials which otherwise have superb luminescent properties in solution. Most of these efforts are basically aimed towards controlling the aggregation process to prevent excimer formation [ 14 , 15 , 16 , 17 ] that is thought to be at the origin of ACQ in many cases [ 18 , 19 ]. A breakthrough in the field occurred in 2001 when Tang and co-workers observed that 1-Methyl 1,2,3,4,5-pentaphenylsilole, a poor luminogen which was hardly emissive in common organic solvents, became surprisingly highly emissive upon aggregation [ 20 ].…”

“…It is known that the efficient organization of molecules via supramolecular interactions results in the restriction of the intramolecular motion (RIM) and the blockage of the non-radiative deactivation pathways giving rise to the activation of the AIE process [ 12 , 13 , 14 ]. Different approaches have been used to study the effect of intramolecular motion in the AIE mechanism as, for instance, computational modelling or, from an experimental point of view, the control of the solution’s viscosity [ 15 , 16 , 17 , 18 , 19 ]. It is, however, still hard to precisely determine and control how aggregation actually limits intramolecular motion giving rise to AIE.…”

Does phenazine form triplet excimer and dimer anion radical?

“…The results suggest that the 380 nm peak may be assigned to 3 (PZ) 2 * . Evidence for triplet excimer formation has been observed earlier in some cases [18][19][20][21][22]. Castro and Hochstrasser had first reported triplet excimers for halogenated benzenes from low temperature phosphorescence studies [18].…”

Delayed Fluorescence of the Kautsky‐Müller Type from Liquid Solutions of Aromatic Compounds and Oxygen

“…The straightforward explanation of the difference between the two spectra is that the major fraction of the delayed fluorescence is emitted from excited dimers of phenanthrene. Following Chandross and Dempster [45], we make a distinction between the terms excited dimer and excimer; in an excited dimer the interaction between the two molecules is similar to that in the ground-state dimer. In perfluorohexane the excited dimer of phenanthrene is relatively stable since the solute-solute interaction is much stronger than the solute-solvent interaction.…”