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High-Efficiency Pure-Red Perovskite Quantum-Dot Light-Emitting Diodes
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DOI：10.1021/acs.nanolett.2c03062.png)
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Abstract
En 中文
It is still challenging to achieve high-efficiency pure -red (620-650 nm wavelength) perovskite light-emitting diodes (PeLEDs). Herein, we report pure-red PeLEDs with Commission Internationale de l'Eclairage coordinates (0.703, 0.297) meeting the Rec. 2020, an external quantum efficiency of 20.8%, and a luminance of 3775 cd/m2. This design is based on the strong quantum confinement CsPbI3 quantum dots (QDs) capped by composite ligands of 3-phenyl-1-propylamine and tetrabutylammonium iodide. This strategy stabilized the structure of the strong-confined QDs and reduced the influence of the electric field-induced Stark effect on the PeLEDs. Furthermore, the exciton binding energy of the QDs was decreased by the composited ligands to suppress Auger recombi-nation within the devices. Additionally, the valence-band maximum of the QDs was lifted to match the hole-transport layer, thus balancing charge injection in the PeLEDs. Our device also demonstrated a stable electroluminescence spectrum and a lifetime of 5.6 times longer than the control device.
Keywords:
perovskite light-emitting diodes
quantum dots
pure-red emission
high efficiency
quantum confinement
Journal
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9.1
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2.7W
Citations:
16.5W
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Cited Papers