Operational stability of perovskite light emitting diodes

Abstract

Organometal halide perovskite light emitting diodes (LEDs) have attracted a lot of attention in recent years, owing to the rapid progress in device efficiency. However, their short operational lifetime severely impedes the practical uses of these devices. The operating stability of perovskite LEDs are due to degradation due to ambient environment and degradation during operation. The former can be suppressed by encapsulation while the latter one is the intrinsic degradation due to the electrochemical stability of the perovskite materials. In addition, perovskites also suffer from ion migration which is a major degradation mechanism in perovskite LEDs. In this review, we specifically focus on the operational stability of perovskite LEDs. The review is divided into two parts: the first part contains a summary of various degradation mechanisms and some insight on the degradation behavior and the second part is the strategies how to improve the operational stability, especially the strategies to suppress ion migration. Based on the current advances in the literature, we finally present our perspectives to improve the device stability.

Elucidating and Mitigating Degradation Processes in Perovskite Light‐Emitting Diodes

“…[ 10,15–19 ] Although the sensitivity of the devices to atmospheric effects such as oxygen and water can be mitigated through effective packaging techniques, [ 20 ] there is also an intrinsic instability in the devices with the high electric fields experienced under LED operation. [ 21 ] This instability appears to be caused by a combination of ionic migration and Joule heating, [ 20,22–26 ] which ultimately leads to degradation of the device performance. In order to overcome these degradation processes, a comprehensive understanding of the degradation location in the device and underlying degradation mechanisms under device operation conditions is essential, thereby allowing a rational approach to stabilize operation.…”

Reconfigurable Perovskite LEC: Effects of Ionic Additives and Dual Function Devices

“…[ 43 ] It may also slow down other intrinsic ionic migration effects, all of which play a major negative role in instability of perovskite LEDs, as summarized in recent review by So team, where the highest apparent reported luminance was 250 h at 100 cd m −2 . [ 129,130 ]…”

Color Tuning for Perovskite Light-Emitting Diodes

“…Beyond these limits, the operation lifetime of PeLEDs is far from the requirement for commercial use. [34]…”