High-Performance Blue Perovskite Light-Emitting Diodes Enabled by Synergistic Effect of Additives

Area of Science:

• Materials Science
• Optoelectronics
• Chemistry

Background:

• Quasi-two-dimensional (quasi-2D) perovskites offer potential for high-efficiency blue perovskite light-emitting diodes (PeLEDs) due to favorable properties like cascade energy transfer and high quantum efficiency.
• However, challenges in domain distribution management and carrier transport hinder the performance of blue quasi-2D PeLEDs.

Purpose of the Study:

• To enhance the performance of blue quasi-2D PeLEDs by addressing issues in phase distribution and carrier transport.
• To investigate the synergistic effects of dual additives, (2-(9H-carbazol-9-yl)ethyl)phosphonic acid (2PACz) and methyl 2-aminopyridine-4-carboxylate (MAC), on blue quasi-2D perovskite films.

Main Methods:

• Simultaneously introduced (2-(9H-carbazol-9-yl)ethyl)phosphonic acid (2PACz) and methyl 2-aminopyridine-4-carboxylate (MAC) into a blue quasi-2D perovskite film.
• Utilized the synergistic effect of 2PACz and MAC to modulate phase distribution and improve electrical properties.
• Fabricated and characterized the modified blue quasi-2D PeLED devices.

Main Results:

• The synergistic action of 2PACz and MAC effectively modulated the phase distribution, specifically inhibiting the undesirable n = 2 phase.
• Significant improvements in the electrical properties of the quasi-2D perovskite film were achieved.
• The modified blue quasi-2D PeLED exhibited a high external quantum efficiency (EQE) of 17.08% and a luminance of 10142 cd m⁻².

Conclusions:

• The dual additive strategy employing 2PACz and MAC demonstrates a synergistic effect for optimizing blue quasi-2D perovskite films.
• This approach successfully addresses phase distribution and carrier transport imbalances, paving the way for highly efficient blue PeLEDs.
• The study provides a new effective additive strategy for fabricating high-performance blue PeLEDs.