Multifunctional Charge Transporting Materials for Perovskite Light-Emitting Diodes.

Area of Science:

• Materials Science
• Optoelectronics
• Chemistry

Background:

• Metal halide perovskites are promising light-emitting materials due to their narrow emission, color tunability, and high photoluminescence quantum yields.
• Perovskite light-emitting diodes (PeLEDs) efficiency is limited by defects, poor morphology control, and ion migration, particularly at interfaces with charge transporting layers (CTLs).

Purpose of the Study:

• To summarize the fundamental limitations of perovskites as emitters in PeLEDs.
• To review recent advancements in multifunctional CTLs designed to overcome these limitations.
• To discuss the device applications and future prospects of these CTLs for improved PeLED performance.

Main Methods:

• Review of existing literature on perovskite properties and PeLED device architectures.
• Analysis of the role of interfaces between perovskite emitting layers and CTLs.
• Summarization of strategies employing multifunctional CTLs for defect passivation, morphology control, and enhanced charge transport.

Main Results:

• Perovskite emitters suffer from defects, morphological/phase instability, and poor light outcoupling due to their high refractive index.
• Multifunctional CTLs can simultaneously improve charge transport, passivate defects, control morphology, suppress ion migration, and enhance light outcoupling.
• Recent developments show significant improvements in PeLED efficiency and stability through the use of tailored CTLs.

Conclusions:

• Multifunctional CTLs are essential for realizing the full potential of perovskite emitters in high-performance PeLEDs.
• Further research into novel CTL materials and device integration is needed to advance PeLED technology.
• Addressing interfacial issues and intrinsic material limitations via CTLs is key for future PeLED development.