Organic light-emitting diodes using novel embedded al gird transparent electrodes

This work demonstrates a novel transparent electrode using embedded Al grids fabricated by a simple and cost-effective approach using photolithography and wet etching. The optical and electrical properties of Al grids versus grid geometry have been systematically investigated, it was found that Al grids exhibited a low sheet resistance of 70 Ω □−1 and a light transmission of 69% at 550 nm with advantages in terms of processing conditions and material cost as well as potential to large scale fabrication. Indium Tin Oxide-free green organic light-emitting diodes (OLED) based on Al grids transparent electrodes was demonstrated, yielding a power efficiency >15 lm W−1 and current efficiency >39 cd A−1 at a brightness of 2396 cd m−2. Furthermore, a reduced efficiency roll-off and higher brightness have been achieved compared with ITO-base device.