Enhanced light out-coupling of organic light-emitting diode using metallic nanomesh electrodes and microlens array
Journal
Optics Express
Journal Volume
21
Journal Issue
7
Pages
8535-8543
Date Issued
2013
Author(s)
Ho, Y.-H.
Chen, K.-Y.
Peng, K.-Y.
Tsai, M.-C.
Tian, W.-C.
Wei, P.-K.
WEI-CHENG TIAN
Abstract
A precisely controlled metallic nanomesh was fabricated by using nanosphere lithography to pattern the silver thin film to form hexagonal nanohole arrays with excellent uniformity, high conductivity and good transparency. An Alq3 based OLED, with the silver nanomesh electrode of high fill factor of 70.2% demonstrated a considerable luminous efficiency of 4.8 cd/A, which is 60.9% higher than the referenced device with ITO anode. The periodical nanohole array not only increased the transparency but also helped extracting surface plasmonic wave in organic layers. By attaching the microlens array to further extract the trapped light in substrate, the extraction efficiency enhancement of device with nanomesh anode was 73.8% higher than 50.2% of the referenced device with ITO anode. And the overall current efficiency of device with nanomesh anode was 87.7% higher than traditional ITO based device. © 2013 Optical Society of America.
SDGs
Type
journal article