Shaoxin Song,Yang Liu,Xuejuan Liu,Jianping Ge,Dengteng Ge,Lili Yang
Electrically-responsive photonic crystals have drawn extensive interest due to the growing demands of camouflage, displays, sensing, energy-saving buildings, etc., due to their fine control, fast response and convenient implementation. Veiled by the development on hue modulation, brightness/saturation tuning still remains a challenge. This work demonstrates a strategy to modulate the brightness of electrically-responsive photonic pixels via surface charge treatment of electrodes. The reflection intensity is raised by 110% due to the growth of the short-range ordered Fe3O4@C colloidal lattice as a result of enhanced Coulombic forces. The numerical simulation of the potential of the photonic liquid confirms that the potential distribution depends on the electrode surface charge. Furthermore, wide angle-independent photonic colors are well-tuned due to the anisotropic expansion/compression of the photonic lattice via electrophoretic movements of charged particles under an electric field. We believe that our work not only provides a useful way to modulate brightness but also suggests novel designs for electrically-responsive photonic devices.
As an external stimulus for stimuli-responsive chromic materials, a magnetic field has the benefits of contactless control, instant action, and ease of integration into electronic devices. Hence, the development of a magnetically responsive photonic crystal provides a new platform for color displays. However, magnetically controlled display systems have been primarily limited to liquid systems of colloidal crystals; their application to solid chromic systems has been difficult because the ordered array structure is fixed by a polymer network. A novel solid magnetochromic photonic hydrogel is developed that enables colorimetric responses to an alternating magnetic field (AMF). This notable magnetochromic performance is attributed to the superior magnetothermal effect of 1D aggregates of magnetic chains fixed in a thermosensitive hydrogel. The AMF-responsive magnetic hydrogel exhibits excellent stability for repeated use. This study presents a basis for the development of responsive solid materials with new optical effects for future chromatic applications.
危险品化学品经营许可证（带存储）