Enhanced light extraction by optimizing near-infrared perovskite-based light emitting diode (PeLED)

Area of Science:

• Optoelectronics
• Materials Science
• Photonics

Background:

• Perovskite-based light-emitting diodes (PeLEDs) are promising optoelectronic devices with diverse applications.
• Despite high External Quantum Efficiency (EQE), PeLEDs suffer from limited light extraction efficiency (LEE) compared to Organic Light-Emitting Diodes (OLEDs).

Purpose of the Study:

• To enhance the light extraction efficiency (LEE) of perovskite light-emitting diodes (PeLEDs).
• To investigate the impact of layer thickness optimization and active layer absorption manipulation on LEE.

Main Methods:

• Optimizing the layer thickness within the PeLED structure.
• Manipulating light absorption within the active layer (AL).
• Utilizing CH(NH2)2PbI3 perovskite in the emissive layer (EML).

Main Results:

• Achieved a significant increase in light extraction efficiency (LEE) by nearly 20%.
• Reached a LEE of 42.89% in the near-infrared (NIR) spectral region.
• Demonstrated the effectiveness of structural optimization for improved light outcoupling.

Conclusions:

• Layer thickness optimization and active layer absorption control are crucial for enhancing PeLED performance.
• The developed strategy significantly boosts LEE, particularly in the NIR region.
• This research provides a pathway for developing more efficient NIR-emitting PeLEDs.