Abstract
In this study, we report an Ag-based multilayer structure as the bottom transparent conducting electrode (Ag-TCE) by sandwiching an ultrathin Ag film between commonly used organic hole injection layers for organic light-emitting diode (OLED) applications. This electrode structure fabricated using the same inline fabrication system as organic materials exhibited excellent electrical and optical properties. Ag-TCE showed a high transmittance and low sheet resistance of 79.2% and 17.6 ω/□, respectively, for the ultrathin Ag layer (9 nm). The phosphorescent yellow OLED fabricated with optimized Ag-TCE showed a driving voltage of 4.0 V, an external quantum efficiency of 23.8%, and a current efficiency of 73.2 cd/A. The electroluminescence performance of Ag-TCE OLED is almost similar to the commonly used ITO electrode (25% and 73.2 cd/A). Based on these results, we demonstrate that this electrode structure is a promising alternative to the ITO electrode.
| Original language | English |
|---|---|
| Pages (from-to) | 1538-1544 |
| Number of pages | 7 |
| Journal | ACS Applied Electronic Materials |
| Volume | 2 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 23 Jun 2020 |
Bibliographical note
Publisher Copyright:Copyright © 2020 American Chemical Society.
Keywords
- ITO-free OLED
- coordinate bond
- multilayer electrode structure
- organic nucleation layer
- thermal evaporation
- transparent conducting electrode
- ultrathin Ag film