Traditional electrophoretic displays suffer from poor visibility in low‐light environments due to their reliance on ambient illumination. To address this, we introduce a quantum dot electrophoretic display that integrates electrophoretically controlled reflection and photoluminescent emission in a single pixel architecture. Core–shell CdSe/CdZnSe/CdZnS/ZnS quantum dots are loaded onto pigment red 48:2 particles modified with octadecylamine, yielding stable pigment red 48:2/octadecylamine/quantum dot red electrophoretic particles that migrate rapidly under an electric field and emit strong red fluorescence under ultraviolet light. Furthermore, a white‐red dual‐color ink system is created, enabling the encapsulated quantum dot electrophoretic display to transition among pink, white, red, and fluorescent red colors in dual‐mode operation—reflection under ambient light and emission in darkness. By optimizing the white/red particle ratio and quantum dot loading, the quantum dot electrophoretic display device achieves a 3.02 contrast ratio in reflection mode and 22.4 in emission mode. It exhibits rapid switching (260–290 ms at ±25 V), excellent bistability (>24 h without power), and stable cycling (>1000 s of white‐red switching). The combination of electro‐controlled reflection and optically triggered emission ensures multifunctional performance across diverse lighting conditions. With low power consumption and design flexibility, quantum dot electrophoretic display shows strong potential for all‐weather, energy‐efficient displays.
Zheng et al. (Fri,) studied this question.