Morphology dependent exciton retrapping

Morphology-dependent Exciton Retrapping at Polymer Heterojunctions... 

By considering the EL spectra from Section 2.2.3, we have shown that the amount of EL observed from the endothermically generated bulk excitons is dependent on the film morphology, and we introduced the concept of retrapping of excitons. For nm-scale morphologies, excitons are likely to encounter again an interface during their lifetime and get retrapped into an exciplex, which can reduce exciton EL by more than 70%. 

---