Qing Zhou,Feng Jin,Man Liu,Xiangxi Zhang,Qi Li,Lei Yang
Persistent organic room temperature phosphorescence (p-RTP) luminescent materials have broad application prospects in multiple anti-counterfeiting encryption and other fields. It is generally difficult for single component substances to achieve adjustable full color gamut p-RTP afterglow, and dual component doping may be a feasible solution. Here, by doping a small amount of aromatic acid molecules with controllable conjugation into cellulose nanocrystals (CNC), which can generate various interactions, and full color gamut long afterglow emitting luminescent material with blue to red light is successfully prepared under the same excitation. Not only does it achieve adjustable afterglow color, but it also has long afterglow emission (447.02 ms). The high crystallinity of CNC and its strong hydrogen bonding with doped molecules endow aromatic acid molecules with a liquid nitrogen like environment, resulting in a multi-color afterglow under strong conformational hardening. The frontline orbit theory calculation also proves the above speculation. This simple method for preparing powder materials with all color gamut adjustable p-RTP emission has proven to have great commercial prospects in the field of multiple anti-counterfeiting encryption.
Yifan Liu,Florian Vogelbacher,Xiaoyu Hou,Yanlin Song,Mingzhu Li
Photonic crystal (PhC) displays have garnered significant attention owing to their high color saturation, brightness, wide color gamut, and low energy consumption. However, existing PhC color modulation techniques still suffer from drawbacks such as slow response speed, short cycle life, poor control accuracy, and challenging pixel integration, which severely restrict their application in dynamic displays. Herein, we integrate a two-dimensional PhC film with an electroactive ionic polymer-metal composite (IPMC) actuator featuring titanium carbide/carbon nanotubes (MXene/CNTs) composite electrodes and achieve a dynamic PhC display with full-color-gamut switching. Color change of the prepared PhC display is electrically controlled, localized, and active, enabling precise pixel control. MXene/CNT-IPMC offers electrically addressable, high-speed pixelation which enables rapid color switching for dynamic displays. This synergistic integration of PhC films with actuation devices not only demonstrates their potential for display applications but also lays the foundation for dynamic reflective displays with low energy consumption, high brightness, and wide color gamut.
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