Luminescence and Degeneration Mechanism of Perovskite Light‐Emitting Diodes and Strategies for Improving Device Performance

Abstract

Perovskite light‐emitting diodes (PeLEDs) can be a promising technology for next‐generation display and lighting applications due to their excellent optoelectronic properties. However, a systematical overview of luminescence and degradation mechanism of perovskite materials and PeLEDs is lacking. Therefore, it is crucial to fully understand these mechanisms and further improve device performances. In this work, the fundamental photophysical processes of perovskite materials, electroluminescence mechanism of PeLEDs including carrier kinetics and efficiency roll‐off as well as device degradation mechanism are discussed in detail. In addition, the strategies to improve device performances are summarized, including optimization of photoluminescence quantum yield, charge injection and recombination, and light outcoupling efficiency. It is hoped that this work can provide guidance for future development of PeLEDs and ultimately realize industrial applications.

Defects in lead halide perovskite light-emitting diodes under electric field: from behavior to passivation strategies

“…TrPL is a transient decay assessment method used to analyze charge carrier recombination dynamics, indirectly indicating the extent of defect formation in NCs or films. Typically, the TrPL decay is modeled using the rate equation: 5,60…”

“…TrPL is a transient decay assessment method used to analyze charge carrier recombination dynamics, indirectly indicating the extent of defect formation in NCs or films. Typically, the TrPL decay is modeled using the rate equation: 5,60 where k i ( i = 1, 2, 3, trap, ex, Aug) corresponds to the rate constants and n represents the concentration of carriers. To some extent, PL decay curves can respond to nonradiative recombination processes.…”

Multi‐Species Surface Reconstruction for High‐Efficiency Perovskite Nanocrystal Light‐Emitting Diodes

“…can be used to suppress defects and associated non-radiative recombination. [10][11][12] Therefore, the photoluminescence quantum yield (PLQY) of colloidal PNC solution has reached nearly 100 %. [13] For device application, high-quality perovskite films are necessary.…”

Multi‐Species Surface Reconstruction for High‐Efficiency Perovskite Nanocrystal Light‐Emitting Diodes

“…can be used to suppress defects and associated non-radiative recombination. [10][11][12] Therefore, the photoluminescence quantum yield (PLQY) of colloidal PNC solution has reached nearly 100 %. [13] For device application, high-quality perovskite films are necessary.…”

“…In addition, many effective strategies (ligand passivation, ion doping, etc.) can be used to suppress defects and associated non‐radiative recombination [10–12] . Therefore, the photoluminescence quantum yield (PLQY) of colloidal PNC solution has reached nearly 100 % [13] …”