Strong high-energy exciton electroluminescence from the light holes of polytypic quantum dots

Xingzhi Wang, Yan Gao, Xiaonan Liu, Huaiyu Xu, Ruixiang Liu, Jiaojiao Song, Bo Li (), Huaibin Shen () and Fengjia Fan ()
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Xingzhi Wang: University of Science and Technology of China
Yan Gao: Henan University
Xiaonan Liu: Beijing Institute of Technology
Huaiyu Xu: University of Science and Technology of China
Ruixiang Liu: University of Science and Technology of China
Jiaojiao Song: Henan University
Bo Li: University of Science and Technology of China
Huaibin Shen: Henan University
Fengjia Fan: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract High-energy exciton emission could allow single-component multi-colour display or white light-emitting diodes. However, the thermal relaxation of high-energy excitons is much faster than the photon emission of them, making them non-emissive. Here, we report quantum dots with light hole-heavy hole splitting exhibiting strong high-energy exciton electroluminescence from high-lying light holes, opening a gate for high-performance multi-colour light sources. The high-energy electroluminescence can reach 44.5% of the band-edge heavy-hole exciton emission at an electron flux density Φe of 0.71 × 1019 s−1 cm−2 − 600 times lower than the photon flux density Φp (4.3 × 1021 s−1 cm−2) required for the similar ratio. Our simulation and experimental results suggest that the oscillator strength of heavy holes reduces more than that of light holes under electric fields. We attribute this as the main reason for strong light-hole electroluminescence. We observe this phenomenon in both CdxZn1-xSe-ZnS and CdSe-CdS core-shell quantum dots exhibiting large light hole-heavy hole splittings.

Date: 2024
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DOI: 10.1038/s41467-024-50432-8

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