Efficient Green Quasi-Two-Dimensional Perovskite Light-Emitting Diodes Based on Mix-Interlayer

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Quasi-two-dimensional (Q-2D) perovskites exhibit remarkable photophysical properties, making them promising for optoelectronic applications.
• The phase composition of Q-2D perovskites critically influences device performance, particularly in light-emitting diodes.
• Controlling phase composition and minimizing non-radiative recombination are key challenges in developing efficient perovskite light-emitting diodes (PeLEDs).

Purpose of the Study:

• To fabricate efficient green perovskite light-emitting diodes (PeLEDs) by engineering phase compositions.
• To investigate the role of mix-interlayer ligands in optimizing the performance of Q-2D perovskites.
• To suppress non-radiative recombination pathways in PeLEDs for enhanced efficiency.

Main Methods:

• Employing a mixture of o-fluorophenylethylammonium bromide (o-F-PEABr) and 2-aminoethanol hydrobromide (EOABr) as dual interlayer ligands.
• Utilizing composition and interlayer engineering to rationally optimize phase compositions in Q-2D perovskites.
• Characterizing the photophysical properties and device performance of the fabricated PeLEDs.

Main Results:

• Achieved a peak photoluminescence quantum yield (PLQY) of 81.4% for green PeLEDs.
• Obtained a narrow full width at half maximum (FWHM) of 19 nm, indicating high color purity.
• Realized a maximum current efficiency (CE) of 27.7 cd/A and a maximum external quantum efficiency (EQE) of 10.4%.

Conclusions:

• The introduction of mix-interlayer ligands effectively optimizes phase composition and suppresses non-radiative recombination in Q-2D perovskites.
• The developed strategy provides a feasible method for realizing high-efficiency green PeLEDs.
• This work contributes to the advancement of perovskite optoelectronics and efficient light-emitting device technologies.