Efficient and Stable CF3PEAI-Passivated CsPbI3 QDs toward Red LEDs
Zhenyu Wang1, Xinyu Shen1, Chengyuan Tang1
1State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
ACS Applied Materials & Interfaces
|February 4, 2022
Summary
Introducing 4-trifluoro phenethylammonium iodide (CF3PEAI) in perovskite quantum dot (QD) synthesis improves stability and conductivity. This enhances the performance of QD light-emitting diodes (LEDs), achieving brighter red light emission.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Oleylamine and oleic acid ligands in perovskite quantum dots (QDs) lead to poor stability and conductivity.
- This instability negatively impacts the performance of perovskite QD light-emitting diodes (LEDs).
Purpose of the Study:
- To improve the stability and performance of CsPbI3 quantum dots and their application in LEDs.
- To investigate the effect of incorporating 4-trifluoro phenethylammonium iodide (CF3PEAI) during QD synthesis.
Main Methods:
- Directly introduced 4-trifluoro phenethylammonium iodide (CF3PEAI) during the hot injection synthesis of CsPbI3 QDs.
- Analyzed the modification of I- vacancy defects and ligand substitution on the QD surface.
- Fabricated and characterized perovskite QD light-emitting diodes (LEDs).
Main Results:
- CF3PEAI efficiently modified I- vacancy defects and partially substituted oleylamine on the QD surface.
- The strong electron-withdrawing fluorine in CF3PEAI enhanced surface bonding.
- Achieved QDs with 92% photoluminescence quantum yield and efficient red LEDs with 4550 cd m-2 luminance (4.6-fold increase) and 12.5% external quantum efficiency.
Conclusions:
- CF3PEAI is an effective additive for enhancing the stability and performance of CsPbI3 QDs.
- The modified QDs demonstrate significant potential for high-performance red light-emitting diode applications.
