Phosphonate/Phosphine Oxide Dyad Additive for Efficient Perovskite Light-Emitting Diodes

Area of Science:

• Materials Science
• Optoelectronics
• Chemistry

Background:

• Additives are crucial for improving the efficiency of perovskite light-emitting diodes (PeLEDs).
• Metal-halide perovskites are promising materials for next-generation optoelectronic devices.

Purpose of the Study:

• To introduce a novel phosphonate/phosphine oxide dyad molecular additive (PE-TPPO) for enhancing PeLED performance.
• To investigate the dual roles of PE-TPPO in defect passivation and carrier radiative recombination.

Main Methods:

• Synthesis and characterization of the PE-TPPO molecular additive.
• Fabrication and testing of quasi-two-dimensional green PeLEDs incorporating PE-TPPO.
• Analysis of photoluminescence and electroluminescence properties of perovskite films and devices.

Main Results:

• The phosphine oxide group in PE-TPPO passivates defects, enhancing photoluminescence intensity and film homogeneity.
• The phosphonate group captures electrons, increasing local carrier concentration and accelerating radiative recombination.
• PE-TPPO modified green PeLEDs achieved state-of-the-art efficiencies: 25.1% EQE, 100.5 cd/A CE, and 98.7 lm/W PE.

Conclusions:

• PE-TPPO acts as a synergistic additive, significantly boosting PeLED efficiency.
• The dual functionality of PE-TPPO offers a promising strategy for developing high-performance perovskite optoelectronics.