Excitation energy migration

RET between like molecules. Excitation energy migration in assemblies of chromophores... 

Hwang, I.-W. Kamada, T. Ahn, T. K. Ko, D. M. Nakamura, T. Tsuda, A. Osuka, A. Kim, D. Porphyrin boxes constructed by homochiral self-sorting assembly Optical separation, exciton coupling, and efficient excitation energy migration. J. Am. Chem. Soc. 2004,126, 16187-16198. 

Figure 7 Simplified view of a bidirectional photonic antenna. The middle part shown in tight gray contains donor molecules D. After excitation of D to D, the excitation energy migrates with equal probability to the left and to the right until it reaches an acceptor A (dark gray) which captures the excitation energy and emits it as red-shifted light.

Thus, a number of processes may take place within supramolecular systems, modulated by the arrangement of the components excitation energy migration, photoinduced charge separation by electron or proton transfer, perturbation of optical transitions and polarizabilities, modification of redox potentials in ground or excited states, photoregulation of binding properties, selective photochemical reactions, etc. 

Temperature Dependence of Singlet Excitation Energy Migration in Liquid Benzene as Revealed by Picosecond Laser Photolysis... 

M.M. Yatskou, M. Meyer, S. Huber, M. Pfenniger, and G. Calzaferri, Electronic Excitation Energy Migration in a Photonic Dye-zeolite Antenna. Chem Phys Chem., 2003, 4, 567-587. 

Regarding excitation energy migration, it behaves like a guest molecule in a guest-host blend system... 

Depth-distribution of fluorescent dopants in cast polymer film (4) Fluorescence spectra of poly(N-vinylcarbazole) (PVCz) film doped with perylene are shown in Fig. 6. They consist of two broad structureless excimer bands of the polymer with a shoulder at 375 nm and a peak at 420 nra, and perylene band with a vibrational structure above 450 nm. It is worth noting that the perylene fluorescence intensity under the TIR condition is relatively weaker than that under the normal one. Since the boundary surface is selectively excited under the former condition, the structure near the surface should be different from the bulk. It is well known that the excitation energy migrates over carbazolyl chromophores and is trapped in the doped perylene efficiently. Therefore, the present result means that energy migration efficiency in the host polymer and/or the dopant concentration are a function of the depth from the interface. 

T) Excitation energy migration in the host (2) Transfer from host to guest... 

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