Influence of Light-Matter Interaction on Efficiency of Quantum-Dot Light-Emitting Diodes

Light-matter interaction can affect the radiative decay rate of excitons and thus the emission quantum yield (QY) of quantum dots (QDs). In this work, light-matter interaction and outcoupling efficiency of QD light-emitting diodes with different structures are investigated experimentally and theoretically. We show that the external quantum efficiency (EQE) of top-emitting devices is higher than that of the bottom-emitting devices, which is mainly due to the stronger light-matter interaction and higher light outcoupling efficiency of the top-emitting structures. In addition, we show that the QY enhancement induced by light-matter interaction is more significant for low-QY QDs. Our results suggest that top-emitting structures are more powerful for improving the EQE of devices built with low-QY QDs.

Automated summary

This study investigates the light-matter interaction and outcoupling efficiency of quantum dot light-emitting diodes with different structures, both experimentally and theoretically. The results show that the top-emitting devices have higher external quantum efficiency due to stronger light-matter interaction and higher light outcoupling efficiency. Additionally, the enhancement of emission quantum yield induced by light-matter interaction is more significant for low-QY quantum dots.