Bright Stretchable White Alternating-Current Electroluminescent Devices Enabled by Photoluminescent Phosphor

Alternating current-driven electroluminescent (ACEL) devices have recently emerged as a potential candidate for next-generation smart lighting, stretchable displays, and wearable electronics. Herein, a simple and efficient method is developed to fabricate high brightness, chromatic-stable, and stretchable white ACEL devices through doping wide-spectrum yellow photoluminescent phosphor into blue electroluminescent emissive layer. By tuning the ratio of electroluminescent to photoluminescent phosphors in the emissive layer, the optimized device achieved a maximum brightness of 3150 cd m(-2) for white emission with Commison Internationale de L'Eclairage coordinates of (0.28, 0.34), and manifested a more stable chromaticity than traditional ACEL devices. Moreover, a digital display and stretchable white ACEL device (with a tensile strain of 150%) are demonstrated to show the generality of this approach. The high brightness white ACEL devices proposed in this work offer a simplified architecture with facile fabrication process and large-area compatibility, which may find broad range of applications in wearable optoelectronics.