Photo-triggered full-color circularly polarized luminescence based on photonic capsules for multilevel information encryption

Abstract

Materials with phototunable full-color circularly polarized luminescence (CPL) have a large storage density, high-security level, and enormous prospects in the field of information encryption and decryption. In this work, device-friendly solid films with color tunability are prepared by constructing Förster resonance energy transfer (FRET) platforms with chiral donors and achiral molecular switches in liquid crystal photonic capsules (LCPCs). These LCPCs exhibit photoswitchable CPL from initial blue emission to RGB trichromatic signals under UV irradiation due to the synergistic effect of energy and chirality transfer and show strong time dependence because of the different FRET efficiencies at each time node. Based on these phototunable CPL and time response characteristics, the concept of multilevel data encryption by using LCPC films is demonstrated.

Laser-Written Tunable Liquid Crystal Aberration Correctors

“…The continuous tunable nature of the refractive index of nematic LCs has made them particularly attractive for phase control devices, with new developments in topological manipulation of these LCs increasing application across both imaging and communication. − These developments are particularly attractive for tunable lenses for polarized light, providing a means of continuously controlling the focal length. While some lenses, such as the ones developed by Sato et al, simply adjust the refractive index of the LC within an already curved substrate, others, such as those developed by Chen et al, instead use a series of LC devices coupled with multiple electrodes to create a more complex lens configuration.…”

A Dual‐Responsive Liquid Crystal Elastomer for Multi‐Level Encryption and Transient Information Display

“…With the booming of the Internet of Things (IoT) and 5G wireless communications technology, information security becomes more and more important, promoting the development of responsive materials and technologies for encryption, anti-counterfeiting, and secure storage of information. In recent years, tremendous efforts have been made to develop advanced anti-counterfeiting materials and corresponding encryption techniques, including photonic crystals, [1][2][3][4][5] structural-color materials, [6][7][8] rewritable materials, [9][10][11] wrinkles, [12][13][14] watermarks, [15] holograms, [16] and fluorescent/phosphorescent imaging, [17][18][19][20] etc, to avoid the threat of false information and information leakage. By combining multiple anti-counterfeiting techniques or multiple stimuli (such as light, temperature, pH, and moisture) that trigger decryption, the information is thus made more difficult to copy, enhancing the security level.…”

Simultaneous optical tuning of reflection and fluorescence in a self-organized simple 3D cubic structure by α-cyanodiarylethene-based chiral fluorescence photoswitches

“…20–28 It is well known that light has the advantages of remote controllability, intensity accuracy, and instantaneity. 29–33 Under light irradiation, a BPLC system can produce three kinds of response: photo-induced phase transition, photonic bandgaps (PBGs) migration, and photo-induced patterns. Among them, the dynamic phototuning of PBGs in BPLCs is very important to applications in optics and photonics.…”