Bifacial Color-Tunable Electroluminescent Devices

Alternate current electroluminescent (ACEL) devices provide a range of interesting properties, such as facile large-area processability, mechanical flexibility, and outstanding resilience, when compared with other large-area light-emitting technologies. To widen the scope of possible applications for ACEL devices, color tunability and white light emission are desirable. Here, we introduce a novel three-terminal device architecture based on two monolithically stacked ACEL devices (e.g., orange and blue) that allows for color tunability via independent operation of the subdevices. The tandem devices comprise semitransparent bottom and top electrodes based on networks of silver nanowires, which endow the tandem ACEL device with bifacial Janustype emission. We provide a detailed analysis of the sources of optical losses in single and tandem ACEL devices. Our novel device concept enables novel facets of applications for ACEL in signage and lighting.

Automated summary

The study introduces a novel three-terminal device architecture for color tunability of ACEL devices. By independently operating two ACEL devices (e.g., orange and blue), color tunability is achieved, and the use of silver nanowire networks in the electrodes endows the device with bifacial emission capability. The detailed analysis of optical losses in single and tandem ACEL devices suggests novel applications in signage and lighting.