Interface Engineering with Quaternary Ammonium-Based Ionic Liquids toward Efficient Blue Perovskite Light-Emitting
Fanghao Ye1, Huibo Yan1, Siyang Liu1
1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
ACS Applied Materials & Interfaces
|October 25, 2022
Summary
Ionic liquids improve blue perovskite light-emitting diodes (PeLEDs) by enhancing film quality and suppressing ion migration. This interface engineering boosts efficiency and operational stability, crucial for next-generation displays.
Area of Science:
- Materials Science
- Optoelectronics
- Chemistry
Background:
- Perovskite light-emitting diodes (PeLEDs) show promise, but blue PeLED efficiency lags behind green and red counterparts.
- Interface engineering is key to improving carrier transport and recombination dynamics in PeLEDs.
Purpose of the Study:
- To investigate quaternary ammonium-based ionic liquids as interfacial modification layers for high-performance blue PeLEDs.
- To enhance the efficiency and operational stability of blue PeLEDs.
Main Methods:
- Utilized quaternary ammonium-based ionic liquids, specifically tributylmethylammonium bromide (TMAB), as an interfacial modification layer.
- Analyzed the interaction between quaternary ammonium cations and Pb(Br/Cl)6 octahedra to understand effects on perovskite film morphology and defect formation.
- Evaluated carrier transport, exciton recombination dynamics, and ion migration within the PeLED device structure.
Main Results:
- Quaternary ammonium cations promoted nucleation sites, improving perovskite film morphology and reducing defects.
- Ionic liquid interface layers effectively suppressed ion migration.
- Blue PeLEDs with TMAB interface layers showed a significant EQE increase from 3.5% to 6.7%.
- Operational stability (T50) improved by over 12 times.
Conclusions:
- Quaternary ammonium-based ionic liquids are effective interface modification materials for enhancing blue PeLED performance.
- This approach offers a pathway towards achieving high-efficiency and stable blue PeLEDs for display applications.
