We report the luminescence color change of poly-(2,5-dioctyl para-phenyleneethynylene) (PPE) through variations of the excitation intensity. PPE can exist in one of two phases in a chloroform solution; one is a single molecule phase, and the other is an aggregate phase, where the benzene rings of the adjacent polymer chains stack on top of each other. Only the latter exhibits the intensity dependent color change. The other shows regular photoluminescence; that is, only the emission intensity itself depends on the excitation intensity. The phase change occurs reversibly, and therefore, two ways of changing the emission color are possible. PPE will therefore contribute strongly to future color tuning applications.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry