Modulating Energy and Hole Transfer in InP/ZnS-Rh640 Hybrid Assemblies for Color Conversion and Performance Enhancement of Light-Emitting Diodes

Directing the flow of energy and the transfer of holes that are produced in quantum dots (QDs)-dyes hybrid assemblies is crucial for color-conversion and high-performance light-emitting diodes (LEDs). Here, a tunable light color of LEDs from green to orange to warm white was achieved, which was attributed to the changes in Förster resonance energy transfer (FRET), hole transfer (HT) and cascade FRET processes. Using a combination of steady-state and transient-absorption experiments, the FRET and HT interactions in the InP/ZnS-Rh640 hybrid assemblies exhibit a competitive relationship. Furthermore, the enhancement of HT, suppression of FRET, and suppression of defect-state trapping processes in InP/ZnS-Rh640 hybrid assemblies effectively contribute to the significant improvement in brightness and external quantum efficiency of LEDs. The InP/ZnS-Rh640 hybrid assemblies-based LEDs with color-conversion and high-performance characteristics can be applied to optical imaging and encryption applications.