Preparation method of polymer photonic crystal with adjustable photonic band gap and patterned color display

Abstract

The invention discloses a preparation method of polymer photonic crystals with an adjustable photonic band gap and presenting patterned color display, and belongs to the field of polymer materials. The method comprises the steps: hydrogel polymer microspheres having a soft core-shell structure and having a relatively high surface potential and monodisperse size are selected as building base elements, the hydrogel polymer microspheres are allowed to rapidly form a large area ordered structure by electric field deposition and other ways, and the electric field induced assembled polymer photonic crystals having the photonic band gap property and presenting bright structural colors are obtained. According to different load voltages or load times, the hydrogel polymer microspheres on an electrode plate generates different close packing degrees, the soft hydrogel polymer microspheres have different degrees of volume changes, so that a lattice period of the formed photonic crystals can be adjusted, movement of a reflection spectrum peak position (i.e. the photonic band gap) happens, and thus regulation and control of the photonic crystal material structural colors on a macro level is realized.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for preparing a polymer photonic crystal with adjustable photonic band gap and patterned color display under the induction of an electric field. Background technique [0002] Photonic crystals have been widely concerned by scholars since they were independently proposed by S.John and E.Yablonovitch in 1987. For the artificial microstructure formed by the periodic arrangement of media with different refractive indices, the adjustment of the photonic bandgap of photonic crystals can be achieved by periodically adjusting the dielectric constant to cause changes in the spatial refractive index or lattice period. [0003] The environmental stimulus response of electric field force has always been considered as a relatively intelligent means of manipulation. The use of photonic crystal materials with photoelectric signal conversion capabilities can make them exhibi...

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Problems solved by technology

Due to the high charge distribution on the surface, the vulcanized polystyrene microspheres can exist stably in a pure medium system due to the electrostatic repulsion at a high concentration and self-assemble into a non-closely packed photonic crystal array structure. However, due to the hard and hydrophobic characteristics of polystyrene microspheres, it is difficult to significantly change the size of the particle size due to the stimulation of the external environment. Due to the unstable change of the filling factor, the change of the lattice period will have a serious impact on the half-width of the photonic bandgap, which limits the performance of photoelectric conversion.

For the inverse opal photonic crystal film, which uses polystyrene or silica microspheres with uniform particle size as photonic crystal template and metal, polymer and its derivatives as photonic crystal skeleton, although the response to photonic bandgap changes The performance has been greatly improved, but the preparation cycle of this method is longer, the process requirements are more complicated, and the sample is prone to have large lattice defects, and with the addition of cross-linking agent, this inverse opal photonic crystal film has a relatively high Low toughness and volume expansion ratio, which seriously affect the control range of the photonic band gap, and its sensitivity and accuracy in photoelectric response signal conversion

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