Improving light extraction of flexible OLEDs using a mechanically robust Ag mesh/ITO composite electrode and microlens array

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In this study, we designed a highly flexible, mechanically robust Ag mesh/ITO composite transparent conducting electrode (TCE) integrated with a microlens array (MLA) to improve the light extraction of organic light-emitting diodes (OLEDs). The mechanical flexibility and durability of a flexible OLED based on a Ag mesh/ITO composite TCE were superior to those of a device with a conventional ITO electrode, retaining approximate to 100% initial luminance for up to 1000 cycles at a bending radius of approximate to 2 mm. Additionally, both experimental and theoretical characterizations suggest that the performance of a flexible OLED, such as its external quantum efficiency and angular-dependent emission, vastly improves after the incorporation of MLA due to the additional light scattering induced by the MLA. The combined use of Ag mesh and MLA is a practical way to overcome the brittleness of ITO and improve the out-coupling efficiency of flexible OLEDs (enhancement ratio of approximate to 1.51).
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2018-05
Language
English
Article Type
Article
Keywords

EMITTING-DIODES; TRANSPARENT ELECTRODES; REFRACTIVE-INDEX; CARBON NANOTUBE; HIGH-EFFICIENCY; NANOWIRE MESH; LOW-HAZE; POLYMER; DEVICES; FILMS

Citation

JOURNAL OF MATERIALS CHEMISTRY C, v.6, no.20, pp.5444 - 5452

ISSN
2050-7526
DOI
10.1039/c8tc01415a
URI
http://hdl.handle.net/10203/242631
Appears in Collection
EE-Journal Papers(저널논문)
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