Evidence for temperature-independent triplet diffusion in a ladder-type conjugated polymer

Autor:	M. Reufer, Jochen Feldmann, Pavlos G. Lagoudakis, John M. Lupton, Manfred J. Walter, Ullrich Scherf
Rok vydání:	2006
Předmět:	Materials science Condensed matter physics Exciton Relaxation (NMR) Atom Spin–orbit interaction Singlet state Diffusion (business) Type (model theory) Condensed Matter Physics Phosphorescence Molecular physics Electronic Optical and Magnetic Materials
Zdroj:	Physical Review B. 74
ISSN:	1550-235X 1098-0121
Popis:	We study the temperature dependence of triplet formation and decay by considering the phosphorescence dynamics in a prototypical conjugated polymer matrix. The dynamics of triplet formation as a function of temperature are unraveled by applying an electric field during optical singlet generation and recording the phosphorescence quenching. The diffusivity of triplet excitons in conjugated polymers is shown to be independent of temperature up to $200\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. We propose a diffusion model that describes the relaxation dynamics of triplet excitons at all times through triplet-triplet annihilation and spin orbit coupling at static heavy atom sites.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6e89f4ec31387c9d9383550fa0a869dd https://doi.org/10.1103/physrevb.74.241201 Zobrazit plný text záznamu