Plasmonic nanoparticles boost low-current perovskite LEDs governed by photon recycling effects

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Perovskite light-emitting diodes (PeLEDs) offer excellent color purity and fabrication ease for displays.
• Enhancing PeLED optical and electrical properties is key for next-generation applications.

Purpose of the Study:

• To investigate the impact of embedded plasmonic nanoparticles (NPs) on green-emitting CsPbBr3 PeLED performance.
• To analyze how NP characteristics influence spontaneous emission and charge carrier recombination.

Main Methods:

• Theoretical electro-optical analysis of plasmonic spherical NPs (metal, size, concentration) in CsPbBr3 PeLEDs.
• Focus on the role of photon recycling (PR) in device performance.

Main Results:

• Embedding silver (Ag) NPs significantly enhances PeLED performance across various currents.
• Observed up to a 4-fold increase in external quantum efficiency (EQE) at low currents (0.02 mA cm⁻²).
• Demonstrated improved efficiency retention and reduced current roll-off, enabling high-brightness operation.

Conclusions:

• Plasmonic NPs boost spontaneous emission and influence charge carrier dynamics in PeLEDs.
• Photon recycling is crucial for mitigating optical losses and improving outcoupling efficiency.
• Optimized plasmonic PeLEDs offer a pathway to energy-efficient, high-performance light sources for portable electronics and displays.