Structural reflective colors based on Fabry-Perot (F-P) cavity resonances have attracted tremendous interest for diverse applications, such as color decoration and printing, display, and imaging devices. However, the asymmetric F-P cavity-based reflective colors proposed to date have low color purity and have difficulty to realize a desired vivid color because of a narrow absorption band characteristic in the visible light region. Here, a solution-processed, F-P ultra-broadband light absorber is newly proposed using a high lossy nanoporous material for vivid color generation. An asymmetric metal-insulator-metal structure consists of a high lossy nanoporous metallic film with coupled silver nanocrystals (Ag NCs) as the top layer. The absorbers not only increase the maximum absorption intensity up to ∼98% but also widen the bandwidth by 300 nm, resulting in high color purity in micrometer-scale pixels. Furthermore, the solution-based absorber shows potential to realize a high-resolution display pixel and anticounterfeiting devices having mechanical flexibility using the inkjet printing technology.
Bibliographical noteFunding Information:
This work was financially supported by the Pioneer Research Center Program through the National Research Foundation of Korea (NRF-2014M3A6B3063702), a Global Ph.D. Fellowship (NRF-2016H1A2A1909313) and an Electronics and Telecommunications Research Institute (ETRI) grant funded through the Korean government (18ZB1100, Development of Basic Technologies for 3D Photo-Electronics).
© 2019 American Chemical Society.
- broadband absorber
- optical loss
- reflective color
- silver nanocrystal
ASJC Scopus subject areas
- Materials Science(all)