Doh Chang Lee

Ultrafast Radiative Recombination of Singlet Excitons in Conjugated Polymer Aggregates Modulated by the Intrachain Dissociation–Interchain Delocalization Competition

Abstract We readily modulated relaxation pathways of singlet (S1) excitons in push–pull conjugated polymer (CP, D18) aggregates by controlling the spin-coating process. Transient absorption spectroscopy results reveal that intrachain (localized) S1 excitons are efficiently conver...

Tailoring Excitons, Biexcitons, and Trions Dynamics in CdSe/CdS Dot-in-Rod Nanomaterials for Light-Emitting Devices

Abstract CdSe-based core−shell nanomaterials offer the possibility of manipulating exciton dynamics and multi-exciton interactions by controlling the core and shell morphologies. In this context, CdSe/CdS dot-in-rod nanostructure (DiR) has emerged as an interesting class of nanom...

Quantum Dot-Induced Kinetic Bottleneck in Singlet Exciton Relaxation of Conjugated Polymer Aggregates

Abstract We designed hybrid aggregate model systems with cascade energy alignment from conjugated polymers (CPs) to quantum dots (QDs) to investigate the effects of QDs on CP singlet (S1) excitons. Radiative recombination of S1 excitons occurs within 1 ps in the chlorinated CP/QD...