Pure-red electroluminescence of quantum-confined CsPbI3 perovskite nanocrystals obtained by the gradient purification method
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 101533 |
Journal / Publication | Materials Today Energy |
Volume | 41 |
Online published | 15 Feb 2024 |
Publication status | Published - Apr 2024 |
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Abstract
Pure-red emission light-emitting diodes (LEDs) are highly desirable for display and lighting applications. Here, we present a synergistic approach to fabricate pure-red emission LEDs based on quantum-confined CsPbI3 nanocrystals (NCs). By introducing ZnI2 acting as a co-precursor and passivating agent into the synthesis, and applying a gradient post-synthesis purification method allowing us to obtain size-selected fractions with precisely adjusted emission colors, we obtained uniform and small (about 6 nm), quantum-confined CsPbI3 NCs exhibiting high stability in ambient conditions and a superior photoluminescence quantum yield of up to 88%. These NCs exhibited the tendency to undergo oriented attachment, resulting in self-assembled superstructures with a pure-red emission at 629 nm. Importantly, partial recrystallization into fused superstructures led to removal of the insulating ligand barriers between NCs. LEDs based on the CsPbI3 NCs showed pure-red electroluminescence at 633 nm, with an external quantum efficiency of 14.7% and a luminance of over 1000 cd/m2. Our study reveals the mechanism behind the oriented attachment and assembly of small, quantum-confined CsPbI3 NCs, and contributes to the development of pure-red electroluminescent LEDs. © 2024 Elsevier Ltd
Research Area(s)
- Lead iodide perovskite, Light-emitting device, Pure-red emission, Quantum dots, Size-selective precipitation
Citation Format(s)
Pure-red electroluminescence of quantum-confined CsPbI3 perovskite nanocrystals obtained by the gradient purification method. / Liu, Haochen; Xiao, Xiangtian; Wu, Ye et al.
In: Materials Today Energy, Vol. 41, 101533, 04.2024.
In: Materials Today Energy, Vol. 41, 101533, 04.2024.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review