| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - Triplet Energy Migration in Layer-by-Layer Deposited Ultrathin Polymer Films BearingTris(2,2‘-bipyridine)ruthenium(II) Moieties
|
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - Ultrathin polymer films bearing tris(2,2‘-bipyridine)ruthenium(II) (Ru) moieties were fabricated by the layer-by-layer deposition technique. The triplet energy migration among the Ru moieties was investigated by emissionspectroscopy for quenching of the phosphorescence of the Ru moiety by a ferrocene moiety in heterostructuredlayer-by-layer films. The absorbance of the Ru moiety in the films increased linearly as the number of bilayersincreased, showing a linear growth of the thickness in a scale of nanometers. The quenching efficiency increasedas the concentration of the Ru moiety increased. This increase in the efficiency showed that the triplet excitationenergy migrates in the Ru layers. The diffusion of the excitation energy was analyzed quantitatively on thebasis of one-dimensional diffusion in a finite thickness. A diffusion coefficient of 2 × 10-5 cm2 s-1 wasobserved in the layer-by-layer films made of a polycation with 18 mol % of Ru moiety. The root meansquare of the migration distance was calculated to be 36 nm, which is much longer than a Perrin radius of 1.5nm for the direct quenching of the Ru moiety by the ferrocene moiety and comparable to that in singletenergy migration. This efficient triplet energy migration shows that the layer-by-layer films serve as a light-harvesting system.
|
| article type
| |
| is part of this journal
| |
