AUTHOR=Samaeifar Fatemeh , Aziz Hany 

TITLE=The Root Causes of the Limited Electroluminescence Stability of Solution-Coated Versus Vacuum-Deposited Small-Molecule OLEDs: A Mini-Review

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.857551

DOI=10.3389/fchem.2022.857551

ISSN=2296-2646

ABSTRACT=Using solution-coating methods for the fabrication of organic light emitting devices (OLEDs) offers a tremendous opportunity for enabling low cost products and new applications. The electroluminescence (EL) stability of solution-coated (SOL) OLEDs however is significantly lower than that of vacuum-deposited (VAC) OLEDs causing their operational lifetimes to be much shorter; an issue that continues to hamper their commercialization. The root causes of the lower EL stability of these devices remain unclear. This article briefly reviews and summarizes some of the work that has been done to-date for elucidating the root causes of the lower EL stability of SOL OLEDs, giving a special attention to studies where side-by-side comparisons of SOL and VAC devices of the same materials have been conducted which allow for more reliable conclusions about the specific effects of the solution-coating process on device stability to be made. The mini-review is intended to serve as an introduction to work done to-date on addressing the question of the causes of the lower stability of SOL OLEDs and to stimulate further work for the purpose of closing the existing knowledge gap in this area and surmounting this long standing challenge for the SOL OLEDs technology.