Interfacial "Anchoring Effect" Enables Efficient Large-Area Sky-Blue Perovskite Light-Emitting Diodes

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Perovskite light-emitting diodes (PeLEDs) show promise, but large-area blue devices suffer from poor performance due to film defects and uneven morphology.
• Solution-processed perovskite films often exhibit significant defects and non-uniformity, hindering scalability and efficiency.

Purpose of the Study:

• To develop a facile interface engineering strategy for improving the performance of large-area blue PeLEDs.
• To manipulate perovskite film crystallization using a multifunctional molecule to achieve uniform morphology and reduce defects.

Main Methods:

• Interface engineering using 2-amino-1,3-propanediol (APDO) to induce an "anchoring effect" during perovskite crystallization.
• Fabrication and characterization of large-area sky-blue PeLEDs utilizing the APDO-modified perovskite films.

Main Results:

• Achieved large-area uniform sky-blue perovskite films with significantly reduced trap states.
• Demonstrated improved radiative recombination and hole-transport properties in the engineered films.
• Large-area sky-blue PeLEDs (100 mm²) exhibited a peak external quantum efficiency (EQE) of 9.2% and enhanced operational lifetime.
• A 400 mm² sky-blue device achieved a notable EQE of 6.1%.

Conclusions:

• The APDO-induced interface engineering effectively addresses challenges in large-area blue PeLED fabrication.
• This approach offers a viable pathway for realizing high-performance, stable, and scalable blue PeLEDs.