Microcavity top-emission perovskite light-emitting diodes

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Lighting

Background:

• Perovskite light-emitting diodes (LEDs) offer promising applications in lighting and displays.
• High photoluminescence quantum efficiencies in perovskite films are common, but LED efficiency is limited by poor light out-coupling.

Purpose of the Study:

• To enhance the light out-coupling efficiency of perovskite LEDs.
• To achieve high external quantum efficiency (EQE) and radiant exitance in perovskite LEDs.

Main Methods:

• Employed the microcavity effect to improve light extraction in perovskite LEDs.
• Analyzed angle-dependent emission profiles to confirm enhanced microcavity and light out-coupling efficiencies.

Main Results:

• Achieved a high external quantum efficiency (EQE) of 20.2%.
• Demonstrated an ultrahigh radiant exitance of up to 114.9 mW cm⁻².
• Confirmed enhanced light out-coupling through angle-dependent emission studies.

Conclusions:

• The microcavity effect is an effective strategy for enhancing light extraction in perovskite LEDs.
• Simultaneous optimization of both optical and electrical properties is crucial for developing high-performance perovskite LEDs.