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Published on: October 1, 2019
Pure-Red Light-Emitting Diodes Based on Lead Halide Perovskite Nanoplatelets Obtained by Ostwald Ripening and
Aleksandr P Litvin1, Ziqi Song1, Xiaoyu Zhang1
1Key Laboratory of Automobile Materials MOE, School of Materials Science & Engineering, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun, 130012, P. R. China.
Researchers developed a method to precisely control perovskite nanoplatelet thickness for vibrant red light-emitting diodes (LEDs). This breakthrough enables high-efficiency LEDs meeting ultra-high definition display standards.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Metal halide perovskite nanoplatelets (NPls) offer tunable light emission for advanced LEDs.
- Controlling the thickness of perovskite NPls, measured in monolayers (ML), is a significant fabrication challenge.
Purpose of the Study:
- To investigate thickness transformations in CsPbBr3 NPls via Ostwald ripening.
- To develop a method for synthesizing monodisperse, thick perovskite NPls.
- To achieve pure-red emitting CsPbI3 NPls for high-performance LEDs.
Main Methods:
- Studied Ostwald ripening for CsPbBr3 NPl thickness control.
- Employed post-synthetic lateral growth for NPl self-purification.
- Utilized a two-step Br- to I- anion exchange for CsPbI3 NPl synthesis.
Main Results:
- Achieved a monodisperse ensemble of 5ML CsPbBr3 NPls by optimizing Ostwald ripening.
- Synthesized pure-red emitting CsPbI3 NPls with near-unity photoluminescence quantum yield.
- Fabricated LEDs with 17.3% external quantum efficiency and narrow 26 nm electroluminescence at 637 nm.
Conclusions:
- Controlled Ostwald ripening and lateral growth enable precise perovskite NPl thickness.
- The developed anion exchange method yields high-quality red-emitting CsPbI3 NPls.
- These NPls meet Rec 2020 standards for pure-red emission in ultra-high definition displays.
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