Interfacial Regulation toward Efficient CsPbBr₃ Quantum Dot-Based Inverted Perovskite Light-Emitting Diodes.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Inverted perovskite light-emitting diodes (PeLEDs) are promising for next-generation displays.
• High performance is hindered by fluorescence quenching from zinc oxide (ZnO) layers.
• Developing efficient inverted PeLEDs requires addressing interface charge dynamics.

Purpose of the Study:

• To enhance the performance of inverted green CsPbBr3 quantum dot (QD) LEDs.
• To mitigate luminescence quenching at the ZnO/emissive layer interface.
• To provide a fabrication pathway for high-performance inverted PeLEDs.

Main Methods:

• Fabrication of inverted green CsPbBr3 QD LEDs utilizing an emitting buffer layer.
• Employing ultrathin CsPbBr3 QD emitters as a buffer layer.
• Characterization of device performance, including external quantum efficiency (EQE).

Main Results:

• The CsPbBr3 QD buffer layer effectively reduced interface luminescence quenching.
• The buffer layer regulated charge transport and enhanced exciton recombination.
• The resulting device achieved an external quantum efficiency (EQE) of 13.1%, a 4.7-fold improvement.

Conclusions:

• An efficient inverted green CsPbBr3 QD LED was successfully fabricated using a QD buffer layer.
• The QD buffer layer strategy effectively suppresses ZnO-induced quenching and improves device performance.
• This approach offers a viable route for developing high-performance inverted PeLEDs for lighting and display applications.