Amide Hydrochloride Molecules Enable Energy-Efficient Near-Infrared Perovskite LEDs.

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Physics

Background:

• Perovskite light-emitting diodes (PeLEDs) show promise but struggle with low energy conversion efficiencies (ECEs).
• Poor ECEs are linked to low external quantum efficiencies (EQEs) from non-radiative recombination and high operating voltages.
• Critical applications like wearables require low-power, low-voltage devices, hindering PeLED adoption.

Purpose of the Study:

• To enhance both EQEs and ECEs in perovskite LEDs.
• To reduce operating voltage and non-radiative recombination losses.
• To enable low-power and low-voltage operation for advanced applications.

Main Methods:

• Utilized FA_1-xCs_xPbI₃ perovskite material for LEDs.
• Introduced β-alaninamide hydrochloride (BAH) as a molecular passivator.
• Investigated the effect of BAH on perovskite phase formation and defect passivation.

Main Results:

• Achieved simultaneously enhanced EQEs (∼23.6%) and ECEs (∼24.6%) in near-infrared (795 nm) PeLEDs.
• Demonstrated suppressed non-radiative recombination and reduced operating voltages.
• Obtained excellent device performance across a broad wavelength range (723-795 nm).

Conclusions:

• BAH molecular passivation effectively improves PeLED performance.
• The developed PeLEDs offer high efficiency and low voltage operation.
• This work advances energy-saving and scalable perovskite LED technology.