Efficient and Stable Red Perovskite Light-Emitting Diodes via Thermodynamic Crystallization Control

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Red perovskite light-emitting diodes (PeLEDs) show promise for displays and biomedical uses.
• Commercialization is hindered by challenges in long-term stability and external quantum efficiency (EQE).

Purpose of the Study:

• To develop an in situ crystallization regulation strategy for optimizing red PeLEDs.
• To enhance the stability and efficiency of red PeLEDs for commercial viability.

Main Methods:

• An in situ crystallization regulation strategy using mixed vapor (dimethyl sulfoxide and carbon disulfide) during annealing.
• Vapor design to control perovskite crystallization and minimize surface defects.
• Characterization of perovskite film properties and device performance.

Main Results:

• Achieved well-aligned cascade phase arrangement in perovskite films.
• Reduced perovskite surface defect density and blocked ion migration.
• Demonstrated spectrally stable red PeLEDs with record peak EQEs (up to 32.14%).
• Obtained prolonged half-lifetimes (up to 60.0 hours) at high initial luminances.

Conclusions:

• The developed strategy offers a universal approach for optimizing perovskite crystallization.
• Significant progress towards the commercialization of high-performance red PeLEDs.