Interfacial Engineering of Quantum Dot-Decorated FeOOH Coupled with TiO2 Particles for Environmentally Adaptive and
Xingke Zheng1,2, Yun Ye1,2, Yuanyi Liu1,2
1National and Local United Engineering Laboratory of Flat Panel Display Technology, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350108, China.
Abstract:
Developing outdoor displays that combine low power consumption with high visibility remains a major challenge for sustainable information technologies. Electrophoretic displays (EPDs) are reflective and energy-efficient but suffer from poor color saturation, limited brightness, and the lack of nighttime emissive capability. Herein, we report that functional composite electrophoretic particles, denoted as FeOOH@QD, are prepared by grafting green CdZnSeS/ZnS quantum dots (QDs) onto FeOOH pigment particles via a surface-initiated polymerization. The FeOOH@QD particles exhibit excellent charge stability and high color purity, as well as dual-mode optical behavior, showing vivid green reflection under daylight and bright green fluorescence under 365 nm UV excitation. By integrating these particles with modified white TiO2-KH570-PLMA electrophoretic particles, a QD-enhanced electrophoretic display (QDEPD) is fabricated. The QDEPD demonstrates rapid switching speeds (210-250 ms at ±30 V), high contrast ratios (3.6 in reflection mode and 22.6 in emission mode), long-term bistability with image retention over 24 h without power, and excellent cycling durability. Importantly, the dual-mode QDEPD operates without backlight under ambient light and requires only intermittent low-voltage driving, greatly reducing power consumption. By combining reflection and emission modes, the QDEPD enables environment-adaptive and energy-efficient viewing, highlighting its potential for sustainable outdoor display technologies.
