Arginine-Mediated Buried-Interface Regulation Enables Efficient Air-Processed Green Perovskite Light-Emitting Diodes
Zihan Zong1, Li Song1, Ganlu Fan1
1Tianjin Key Laboratory of Electronic Materials and Device, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin300401, China.
The Journal of Physical Chemistry Letters
|August 13, 2026
Summary
Amino acid modification of hole transport layers enables efficient, stable, air-processed perovskite light-emitting diodes (PeLEDs). This strategy enhances film quality and passivates defects for improved performance in displays and lighting.
Area of Science:
- Materials Science
- Optoelectronics
- Chemical Engineering
Background:
- Air-processed perovskite light-emitting diodes (PeLEDs) offer low-cost, scalable solutions for displays and lighting.
- Ambient fabrication challenges include moisture sensitivity and uncontrolled crystallization, causing interfacial defects that reduce efficiency and stability.
- Defect-assisted nonradiative recombination significantly hinders PeLED performance.
Purpose of the Study:
- To develop an interfacial engineering strategy for air-processed PeLEDs using amino acid modification.
- To improve the quality and stability of perovskite films fabricated under ambient conditions.
- To passivate interfacial trap states and reduce nonradiative recombination in PeLEDs.
Main Methods:
- Utilized l-arginine (l-Arg)-modified PEDOT:PSS as a hole transport layer for air-processed FAPbBr3 perovskite films.
- Investigated l-Arg's effect on precursor wettability, nucleation behavior, and film hydrophobicity.
- Analyzed l-Arg's interaction with perovskite film defects, including bromide vacancies and undercoordinated Pb2+ ions.
Main Results:
- l-Arg incorporation led to uniform nucleation, dense, high-quality perovskite films with enhanced hydrophobicity.
- Effective passivation of interfacial trap states and mitigation of nonradiative recombination were achieved.
- Optimized PeLEDs exhibited a maximum luminance of 47,100 cd m-2, current efficiency of 24.9 cd A-1, and peak external quantum efficiency of 6.62%.
- Substantially improved operational stability was observed for the l-Arg modified PeLEDs.
Conclusions:
- Amino acid-mediated bottom-interface modulation is a facile and effective strategy for advancing ambient-processed PeLEDs.
- This approach significantly enhances the efficiency and stability of air-processed perovskite optoelectronics.
- The findings pave the way for practical applications of PeLEDs in displays and lighting technologies.
