Point‐Excitation Wide‐Field Upconversion Imaging via a Holographic Polymer Waveguide
Abstract
ABSTRACT Organizing upconversion functionality into an integrated material system holds great promise for high‐security encryption and data diversification. However, the practical application of facile upconversion imaging has long been hindered by its limited active area. Herein, we address this challenge by designing a holographic polymer waveguide composed of liquid crystals (LCs) and dithienylethene (DTE) as the high‐refractive‐index phase, with a polymer matrix embedded with upconversion nanoparticles serving as the low‐refractive‐index phase. This design enables the transformation of upconversion emission from a localized point to a macroscopic area, expanding the imaging region by up to 225 times. Mechanistic studies reveal that the synergy between LCs and DTE is crucial: the high‐refractive‐index LCs facilitate waveguiding, while DTE promotes the formation of well‐defined holographic waveguide structures. Beyond this conceptual advance, the holographic polymer waveguide has successfully enabled triple‐mode image encryption—integrating solidified holograms with rewritable upconversion and photochromic images—thereby opening new avenues for high‐security anticounterfeiting technologies.
Article Details
Authors (8)
Yue Zhang
Dengfu Lu
State Key Laboratory of Materials Processing and Die & Mould Technology, and Key Lab of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering
Ying Ma
Yonggui Liao
State Key Laboratory of Materials Processing and Die & Mould Technology, and Key Lab of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering
Xingping Zhou
State Key Laboratory of Materials Processing and Die & Mould Technology, and Key Lab of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering
Zhong'an Li
Key Laboratory for Material Chemistry of Energy Conversion and Storage (Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Huazhong University of Science and Technology (HUST) Wuhan 430074 China
Haiyan Peng
State Key Laboratory of Materials Processing and Die & Mould Technology, and Key Lab of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering
Xiaolin Xie
State Key Laboratory of Materials Processing and Die & Mould Technology, and Key Lab of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering