Highly Flexible, Electrically Driven, Top-Emitting, Quantum Dot Light-Emitting Stickers

• Main Authors: Yang, Xuyong, Mutlugun, Evren, Dang, Cuong, Dev, Kapil, Gao, Yuan, Tan, Swee Tiam, Sun, Xiao Wei, Demir, Hilmi Volkan
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2016
• Subjects: electroluminescence; flexibility
• Online Access: https://hdl.handle.net/10356/81547; http://hdl.handle.net/10220/40861
• Institution: Nanyang Technological University

Flexible information displays are key elements in future optoelectronic devices. Quantum dot light-emitting diodes (QLEDs) with advantages in color quality, stability, and cost-effectiveness are emerging as a candidate for single-material, full color light sources. Despite the recent advances in QLED technology, making high-performance flexible QLEDs still remains a big challenge due to limited choices of proper materials and device architectures as well as poor mechanical stability. Here, we show highly efficient, large-area QLED tapes emitting in red, green, and blue (RGB) colors with top-emitting design and polyimide tapes as flexible substrates. The brightness and quantum efficiency are 20 000 cd per m2 and 4.03percent, respectively, the highest values reported for flexible QLEDs. Besides the excellent electroluminescence performance, these QLED films are highly flexible and mechanically robust to use as electrically driven light-emitting stickers by placing on or removing from any curved surface, facilitating versatile LED applications. Our QLED tapes present a step toward practical quantum dot based platforms for high-performance flexible displays and solid-state lighting.