Multifunctional Interfacial Molecular Bridge for Highly Efficient and Mechanically Robust Flexible Blue Perovskite...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Metal halide perovskites are promising for flexible optoelectronics.
• Challenges include low charge utilization and poor mechanical durability in blue-emitting devices.

Purpose of the Study:

• To develop efficient and mechanically robust flexible blue perovskite light-emitting diodes (PeLEDs).
• To address limitations in charge utilization and durability using a molecular bridging strategy.

Main Methods:

• Utilized a multifunctional molecular bridging strategy with trifluoroacetate (TFA-) based molecules.
• Investigated TFA- bridge's role in enhancing interfacial adhesion and stress dissipation.
• Analyzed TFA- molecule's effect on perovskite crystallization and exciton confinement.

Main Results:

• Achieved high external quantum efficiency of 20.05% in flexible blue PeLEDs.
• Demonstrated outstanding bending durability, retaining over 90% performance after 2000 cycles (5 mm radius).
• TFA- bridge effectively stabilized perovskite phase and device interface.

Conclusions:

• Biomimetic molecular bridges offer a dual role in stabilizing perovskite bulk phase and device interface.
• This strategy provides a generalizable route for high-performance, mechanically robust flexible optoelectronics.
• TFA- molecules enable efficient exciton confinement and energy transfer in blue PeLEDs.