Title
Printed Copper Grid Transparent Conducting Electrodes for Organic Light-Emitting Diodes
Author
Kamijo, T.
de Winter, S.
Panditha, P.
Meulenkamp, E.
Publication year
2022
Abstract
The transparent conductive electrode (TCE) is a key component of organic light-emitting diodes (OLEDs). High-resolution printed metal grids are a promising alternative to indium tin oxide (ITO). We present results for evaporated OLEDs with a printed copper (Cu) grid with line width below 3 μm. The use of a thick doped hole injection layer (HIL) prevented electrical shorts and resulted in good quality OLEDs with acceptable leakage current. We report a detailed analysis of the microscopic uniformity of light emission and compare the measured data with simulations based on finite element modeling (FEM) to investigate various factors that contribute to differences between the Cu grid OLED and ITO reference device. This insight resulted in design rules that enable a luminance of the Cu grid OLED that can potentially equal that of an ITO-based equivalent OLED by using a very fine pitch and narrow line width of 5 μm and 250 nm, respectively, within the capabilities of state-of-the-art printing technology.
Subject
Finite element model
Organic light-emitting diodes
Printed Cu grid
Spatial luminance distribution
Transparent conductive electrodes
To reference this document use:
http://resolver.tudelft.nl/uuid:ce7676ce-dc06-4833-b650-bad2c8dd22e3
DOI
https://doi.org/10.1021/acsaelm.1c01116
TNO identifier
963288
Publisher
American Chemical Society
ISSN
2637-6113
Source
ACS Applied Electronic Materials
Document type
article