Anode‐Patterned Monorail‐Structure Fiber‐Based Organic Light‐Emitting Diodes with Long Lifetime and High Performance for Truly Wearable Displays
Seong Uk Kong, Yongmin Jeon, Ho Seung Lee, Yong Ha Hwang, Jaehyeock Chang, Hagseon Kim, Chan Young Kim, Kyung Cheol Choi
Abstract
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.