Abstract
Solid-state self-quenching processes of highly efficient Ir(III) phosphorescent emitters are investigated by the measurement of thin film photoluminescence quantum efficiency and transient lifetime as a function of doping concentration in a host matrix. The radiative decay rate constant is found to be independent from the average distance between dopant molecules (), and the concentration-quenching rate constant is shown to be dependent on . The quenching dependence on strongly suggests that luminescent concentration quenching in a phosphorescent Ir(III) complex:host film is controlled by dipole-dipole deactivating interactions as described by the Förster energy transfer model.
- Received 7 August 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.017404
©2006 American Physical Society