Phys.org August 6, 2024
Vertically stacked all-organic active-matrix organic light-emitting diodes are promising candidates for high-quality skin-like displays due to their high aperture ratio, extreme mechanical flexibility, and low-temperature processing ability. However, these displays suffer from process interferences when interconnecting functional layers made of all-organic materials. An international team of researchers (USA – Georgia Southern University, China) developed an integration strategy called “discrete preparation-multilayer lamination” based on microelectronic processes. They prepared each functional layer separately on different substrates to avoid chemical and physical damage caused by process interferences and introduced a single interconnect layer between each vertically stacked functional layer to ensure mechanical compatibility and interconnection. The method eliminated the need for protection via barrier and pixel-defining layer processing steps and this strategy allowed multiple pixels to collectively display a pattern. The average mobility of full-photolithographic organic thin-film transistors ensured stable and uniform displays. According to the researchers this strategy forms the basis for the construction of vertically stacked active-matrix displays, which should facilitate the commercial development of skin-like displays in wearable electronics… read more. Open Access TECHNICAL ARTICLE
Schematics of skin-like AMOLED device and main fabrication scheme… Credit: Light: Science & Applications volume 13, Article number: 177, 26 July, 2024