Title
High-performance thin-film encapsulation for organic light-emitting diodes
Author
van de Weijer, P.
Bouten, P.C.P.
Unnikrishnan, S.
Akkerman, H.B.
Michels, J.J.
van Mol, T.M.B.
Publication year
2017
Abstract
Organic light-emitting diodes degrade rapidly by means of local cathode oxidation when exposed to the ambient atmosphere, resulting in visible non-emissive areas called black spots. High performance inorganic based encapsulations are required to protect the OLED. We have applied a hybrid thin-film encapsulation stack consisting of two inorganic barrier layers of silicon nitride deposited at low temperature with an organic layer in between. The resulting water permeation mechanism into the OLED is solely by means of lateral pinhole-to-pinhole transport. With the application of CaO nanoparticles in the organic layer the lateral water transport rate is reduced and we show that black spot formation in 8 cm2 OLEDs is delayed by 6000 h at accelerated climate conditions of 60°C/90% relative humidity. This is estimated to correspond to 20 years at ambient conditions.
Subject
Nano Technology
HOL - Holst
TS - Technical Sciences
Materials
Industrial Innovation
OLEDs
Thin-film encapsulation
Water barrier
To reference this document use:
http://resolver.tudelft.nl/uuid:fc2b1420-8586-430a-9122-9a5f73bff915
DOI
https://doi.org/10.1016/j.orgel.2017.02.009
TNO identifier
753472
Publisher
Elsevier, Amsterdam
ISSN
1566-1199
Source
Organic Electronics: physics, materials, applications, 44, 94-98
Document type
article