Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsjpclett.2c02815
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Funding
- National Natural Science Foundation of China
- Shenzhen Science and Technology Program
- Guangdong University Research Program
- [62174075]
- [JCYJ20210324105400002]
- [JCYJ20220530113809022]
- [2020ZDZX3062]
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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.
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.
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