Full-color, highly bright and stretchable electroluminescent device with Janus colors based on photoluminescent electrode for wireless dynamical display

Stretchable displays are essential for the upcoming era of flexible electronics as they are the foundation of interactive human–machine interface. To date, alternating current electroluminescent (ACEL) devices are regarded as one of the most practicable routes for stretchable displays but their colors are very limited for the demand of full-color displays. Herein, we developed an ACEL device with Janus and full color through photoluminescent electrodes. In the front of the devices, multiple colors are achieved, Red, Blue, Green, and Yellow, covering a 66 % National Television System Committee color gamut. In the back, mixed lights of White, Purple, and Cyan color are obtained, enabling devices with Janus colors. The brightness enhancement of highly desirable white light achieves 4.4-fold, which is also one of the best performances. Our strategy exploits the indispensable electrode for ACEL and avoids structural changes, endowing the devices with a much better stretchability and brightness as compared to traditional methods. Moreover, our strategy is a general method that is applicable to different stretchable ACEL devices. A wearable device of 8*8 pixels is assembled and can dynamically display information from smart phones through Bluetooth in real time, laying a considerable advancement towards stretchable displays with full color.