Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 20, Pages 5444-5452Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc01415a
Keywords
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Funding
- Pioneer Research Center Program through the National Research Foundation (NRF) of Korea - Ministry of Science, ICT & Future Planning [NRF-2013M3C1A3065528]
- Basic Science Research Program through the National Research Foundation (NRF) of Korea - Ministry of Science, ICT & Future Planning [NRF-2017R1A2B2001838]
- Creative Materials Discovery Program through the National Research Foundation (NRF) of Korea - Ministry of Science, ICT & Future Planning [NRF-2017M3D1A1039288]
- National Research Foundation of Korea [2013M3C1A3065528, 2017R1A2B2001838, 31Z20130012940] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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).
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