Morphology-dependent energy transfer

The possibility of controlling the morphological and structural order in the solid is therefore a fundamental requirement for the control and reproducibility of the emission properties of a luminescent material within an organic light emitting diode (OLED) device. 

In this article we have reviewed the results of a joint spectroscopic and morphological investigation of a-sexithienyl (Tg). The lowest singlet electronic level, which is assigned to 1B , splits in the single crystal into four crystalline levels. The structure of the exciton band is investigated by the combined absorption and 

6 Electronic Structure and Energy Transfer in Solid a-Sexithienyl 

Danieli, W. Gebauer, O. Greco, E. Lunedei, R. Mahrt, R. N. Marks, R. Michel, P. Moretti, M. Murgia, P. Ostoja, G. Ruani, P. Samori, T. Virgili, R. Zamboni, D. Beljonne, J. Comil, P. Viville, R. Lazzaroni, J.-L. Bredas, H. Bassler, F. Gamier, G. Horowitz, and A. Bree have participated to the work which is reviewed here. 

We thank Beatrice Stefanelli for help in the preparation of this manuscript. We acknowledge support from the EU-TMR Programme SELOA FMRX-CT960083, and CNR-PF-MSTA II Progetti Coordinati DEMO and FREMO. 

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Khan ALT, 8reearunothai P, Herz LM, Banach MJ, Kohler A (2004) Morphology-dependent energy transfer within polyfluorene thin Aims. Phys Rev B 69 085201... 

MORPHOLOGY DEPENDENCE OF EXCITED SINGLET ENERGY TRANSFER EVENTS... 

In the case of Anabaena, we found that the morphology and sensitivity of the thylakoid membrane, which are dependent on growth conditions, can be readily studied. Although the fluorescence spectra at room temperature are not so easily, or so well, resolved, they certainly show shoulders and dips, which reflect constituent pigment-protein complexes. It should be noted that the ratio of concentrations of the pigment-protein complexes and/or energy transfer efficiencies between them are position dependent in some cases. 

In ERET experiments, the time-dependent fluorescence intensity decay (as described in Section 25.2.3) of the donor is usually measured. By fitting the experimental results with a theoretical decay that takes into account the energy transfer process, it is possible to obtain morphological information on the interface, such as the width of the interface between two polymers. 

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