Morphology-dependent exciton diffusion length in PPE-PPVs thin films as revealed by a Forster mechanism based-study

作者：Saaidia A^*; Saidani M A; Romdhane S; Ben Fredj A; Egbe D A M; Tekin E; Bouchriha H

来源：Synthetic Metals, 2017, 226: 177-182.

DOI：10.1016/j.synthmet.2017.02.023

• Exciton diffusion length
• Conjugated copolymer
• Spectral overlap
• Forster energy transfer mechanism

The effect of thickness and alkoxy side chains on the optical properties of poly(p-phenyleneethynylene)alt-poly(p-phenylenevinylene)s (PPE-PPVs) have been investigated in parallel fashion. A Forster energy transfer mechanism has been invoked in order to infer the exciton diffusion length (L-D). The latter parameter has been determined for six differently alkoxy-substituted PPE-PPVs for different thicknesses. The dependence of L-D upon the donor-acceptor (D-A) distance (d) has been assessed as well. The results reveal an increase of L-D up to 25 nm, with the increase of the sample thickness and side chain length.

• 出版日期2017-4