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Updated: Jun 5, 2026
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Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
Tailoring crystallization kinetics for scalable and efficient large-area perovskite light-emitting diodes
Sung-Doo Baek1,2, Yuanhao Tang1,2, Hyuntae Choi1,2
1Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA.
Science Advances
|June 3, 2026
Summary
This study presents a new solvent engineering method for fabricating uniform perovskite films, crucial for scalable perovskite light-emitting diodes (PeLEDs). This technique overcomes challenges in large-area device production, improving efficiency and enabling new applications.
Area of Science:
- Materials Science
- Optoelectronics
- Chemical Engineering
Background:
- Scalable fabrication of uniform perovskite films is essential for large-area perovskite light-emitting diodes (PeLEDs).
- Current methods face challenges like coffee-ring formation and heterogeneous crystallization during scale-up.
- Uniformity and efficient crystallization are critical for high-performance PeLEDs.
Purpose of the Study:
- To develop a scalable fabrication strategy for uniform perovskite films.
- To overcome limitations of existing methods for large-area PeLEDs.
- To enhance the performance and efficiency of near-infrared (NIR) PeLEDs.
Main Methods:
- A multimodal solvent-engineering strategy was employed.
- Ambient blade coating combined with vacuum-assisted solvent evaporation was utilized.
- A ternary solvent system (N-methyl-2-pyrrolidone (NMP) and acetonitrile (ACN) in dimethylformamide (DMF)) was developed to control evaporation dynamics and precursor coordination.
Main Results:
- The ternary solvent system effectively suppressed solute segregation and tuned nucleation/phase conversion.
- Highly uniform perovskite films with reduced trap densities and enhanced radiative efficiency were achieved.
- Near-infrared (NIR) PeLEDs demonstrated peak external quantum efficiencies of 25.2% (10 mm²), 22.1% (60 mm²), and 19.0% (224 mm²).
Conclusions:
- The developed solvent-engineering strategy enables scalable fabrication of uniform perovskite films.
- This advancement significantly improves the performance of large-area PeLEDs.
- A functional vein-imaging prototype using a 224 mm² device demonstrates the potential for practical optoelectronic applications.
