Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received June 3, 2024
Accepted November 23, 2024
Available online February 25, 2025
-
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
All issues
Improvement of Deformation Stability of Al 2 O 3 Moisture-Barrier Layer by Insertion of 4-Bipyridine Organic Monolayers
https://doi.org/10.1007/s11814-024-00346-4
Abstract
Flexible organic light-emitting diode (OLED) displays are protected from external moisture using an organic–inorganic thin
fi lm encapsulation (TFE) structure. The inorganic thin fi lms used in TFE are excellent moisture barriers, but because they are
fragile, thick organic thin fi lms must be used together. In this study, 4,4′-bipyridine (4-BP), a small organic molecule, was
inserted into the Al 2 O 3 inorganic thin fi lm as monomolecular layers to improve the moisture barrier and fl exibility properties
of the Al 2 O 3 . The 30-nm-thick Al 2 O 3 layer without the 4-BP monomolecular layers cracked after 1000 repeated bendings at
a bending radius of 1 mm, but when these organic molecular layers were introduced, cracking occurred delayed to a radius of
0.7 mm. The eff ect of improving fl exibility due to the introduction of these 4-BP monomolecular layers was verifi ed through
optical Ca tests before and after repeated bending and rolling. In this way, it was shown that small organic molecules such
as 4-BP can be eff ectively used to improve the moisture barrier and fl exibility properties of TFE for fl exible OLED displays.
