Anode-Patterned Monorail-Structure Fiber-Based Organic Light-Emitting Diodes with Long Lifetime and High Performance for Truly Wearable Displays

Abstract

This paper presents a novel monorail-structure fiber-based organic light-emitting diode (MFOLED) with the anode patterned like a monorail to enhance operating reliability. The MFOLED improves the uniformity of layer thickness within the light-emitting region on cylinder fiber despite using only a thermal evaporation method. The device exhibits outstanding operating lifetime (LT50, 720 h), luminance (59335 cd m(-2)), and current efficiency (70.89 cd A(-1)), the highest performances published to date. Additionally, red, green, and blue MFOLEDs are fabricated using the same method and driven by a microcontroller unit to confirm the feasibility of implementing fiber-based subpixels. Based on these results, this work is expected to establish a new benchmark for fiber-based OLEDs and contribute to the realization of truly wearable displays.