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Published on: September 8, 2017
Suppressing Residual Low-Dimensional Phases in Bromide Perovskite LEDs Using a Dimethyl Phosphate Ionic Liquid
Yucai Yuan1, Jingyi Sun1, Yichen Yang1
1State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, ZJU-UIUC Institute, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China.
Researchers developed high-efficiency green perovskite light-emitting diodes (PeLEDs) using a novel ionic liquid additive. This innovation suppresses defects and improves film quality, enabling stable performance at high brightness levels for advanced display technologies.
Area of Science:
- Materials Science
- Optoelectronics
- Chemistry
Background:
- Perovskite light-emitting diodes (PeLEDs) show promise for displays due to high color purity and efficiency.
- Maintaining high efficiency at high luminance remains a challenge for PeLEDs.
- Defects and low-dimensional phases in 3D perovskites hinder device performance.
Purpose of the Study:
- To improve the efficiency and stability of green PeLEDs at high luminance.
- To investigate the effect of ionic liquids on perovskite crystallization and film quality.
- To address the detrimental impact of defects and low-dimensional phases in 3D perovskites.
Main Methods:
- Incorporation of tributyl(methyl)phosphonium dimethyl phosphate (TDP) ionic liquid into the perovskite precursor solution.
- Fabrication of green light-emitting bromide perovskite films.
- Characterization of perovskite film morphology, defect density, and device performance.
Main Results:
- The TDP ionic liquid suppressed the formation of low-dimensional phases and reduced defect density.
- Perovskite films exhibited improved morphology.
- The resulting green PeLEDs achieved a peak external quantum efficiency (EQE) over 20% at 1000 cd m-2.
- Devices demonstrated high brightness (3.7 × 105 cd m-2) and a T50 lifetime of 47 hours at 1000 cd m-2.
Conclusions:
- Dimethyl phosphate ionic liquids are effective in controlling 3D perovskite formation.
- The developed method significantly enhances the performance of green PeLEDs.
- This work contributes to the advancement of high-performance PeLEDs for display applications.
