| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1267691 | Organic Electronics | 2011 | 5 Pages |
Nanosphere lithography is used to pattern metallic thin films to form hexagonal nanohole arrays with both high conductivity and good transparency. We fabricated a silver thin film with a transparency of up to 85% and a sheet resistance lower than 35 Ω/□, which is comparable to the commercial ITO electrode. The nanohole array not only increased the transparency but also helped extracting the guided light trapped in organic layers. Compared to the reference device with ITO anodes, Alq3-based organic light-emitting devices with the silver nanohole arrays reduced the turn-on voltage by 0.82 V and improved the current efficiency by up to 68.8% due to extraction enhancement.
Graphical abstract(a) Current efficiency versus current density and (b) normalized EL spectra of OLED devices with different types of anodes.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A new kind of transparent anode consisted of metallic thin film with periodic nanoholes was made. ► About 85% transparency and 35 Ω/□ silver anodes were demonstrated. ► The large-area nanohole array was fabricated by using nanosphere lithography. ► The patterned silver thin film leads to 0.4 V reduction of turn-on voltage and 84.6% improvement of current efficiency. ► The efficiency enhancement is due to the enhanced extraction of the guiding light in the organic layers by the periodic metallic nanostructure.
