Boosting Perovskite Light-Emitting Diode Performance via Tailoring Interfacial Contact

Area of Science:

• Materials Science
• Optoelectronics
• Nanoscience

Background:

• Solution-processed perovskite light-emitting diodes (LEDs) show promise but suffer from low efficiency and stability.
• Nonradiative charge recombination and imbalanced charge injection hinder perovskite LED performance.
• Existing perovskite LEDs lag behind organic and quantum dot counterparts in efficiency and operational life.

Purpose of the Study:

• To enhance the efficiency and stability of perovskite LEDs.
• To address limitations caused by nonradiative recombination and unbalanced charge injection.
• To develop a facile strategy for improving perovskite LED performance.

Main Methods:

• Interface modification using an amphiphilic conjugated polymer, poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN).
• Fabrication of green perovskite LEDs incorporating the PFN layer.
• Characterization of perovskite film quality, charge recombination, and charge injection balance.

Main Results:

• PFN treatment improved perovskite film quality, significantly suppressing nonradiative recombination.
• Enhanced charge injection balance was achieved.
• A champion current efficiency of 45.2 cd/A (14.4% external quantum efficiency) was obtained for the green perovskite LED.
• The PFN-modified device demonstrated improved operational stability and lifetime.

Conclusions:

• PFN serves as an effective interface modifier for perovskite LEDs.
• The strategy offers a straightforward route to developing highly efficient and stable perovskite-based optoelectronic devices.
• This work contributes to advancing perovskite LED technology towards commercial viability.