High-resolution multilevel reversible color printing based on Sb <sub>2</sub> S <sub>3</sub> phase change materials
Zhiwei Li, Wei Tao, Lihao Sun, Jing Hu, Miao Cheng, Qianqian Liu, Ruirui Wang, Yun Ling, Wanfei Li, Бо Лю
Abstract
Phase change material is promising for a color-changing device owing to its substantial optical contrast between amorphous and crystalline states. However, current phase change material, such as Ge 2 Sb 2 Te 5 thin film, has restrained the color-changing performance owing to its high optical absorption. Sb 2 S 3 thin film, exhibiting large refractive index difference and low absorption between crystalline and amorphous states, is a promising alternative. Here, a color device with Al / Sb 2 S 3 / SiO 2 -stacking layer is prepared, and high-resolution, multilevel, reversible color printing is realized. Wide color gamut is successfully obtained by controlling either the Sb 2 S 3 thickness or its crystallization degree. Furthermore, the proposed color device can be patterned by direct laser writing and erased by a picosecond laser system, possessing good reversible cycling stability. High-resolution pixel higher than 42,000 DPI is further implemented. Moreover, a flexible color device is also fabricated, which possesses superior angular insensitivity from 10° to 60° and is hardly faded after bending and folding 10 times. This work may have wide applications in the fields of color printing, flexible displays, wearable optoelectronic devices, and so forth.