Abstract
We demonstrate an increase of the exciton diffusion length (LD) of a fluorescent donor layer via the process of sensitized phosphorescence, whereby initially generated singlet excitons are transferred to triplet excitons via a properly chosen dopant molecule. Using a poly(p-phenylene vinylene) host doped with the phosphorescent molecule platinum octaethylporphyrin, LD increases from 4 ± 1 to 9 ± 1 nm for an optimal doping of 5 wt%. As a result of the increased LD, the photocurrent from the doped layer increases by 40%. By doping with the fluorescent, non-metalated analogue octaethylporphyrin, a reduction in photocurrent is shown, providing further evidence of the sensitized phosphorescence mechanism.
Original language | English (US) |
---|---|
Pages (from-to) | 1015-1019 |
Number of pages | 5 |
Journal | Organic Electronics |
Volume | 10 |
Issue number | 5 |
DOIs | |
State | Published - Aug 2009 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Biomaterials
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry
- Electrical and Electronic Engineering
Keywords
- 31.50.Df
- 72.80.Le
- 84.60.Jt
- Excition diffusion length
- Organic photovoltaic cells
- Sensitized phosphorescence