Research Progress of Holographic Polymer/Liquid Crystal Composites

doi:10.19894/j.issn.1000-0518.210385

Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (10): 1268-1298.DOI: 10.19894/j.issn.1000-0518.210385

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Research Progress of Holographic Polymer/Liquid Crystal Composites

Dan WANG, Hai-Yan PENG(), Xing-Ping ZHOU, Xiao-Lin XIE()

Key Laboratory for Material Chemistry of Energy Conversion and Storage，Ministry of Education，School of Chemistry and Chemical Engineering，Huazhong University of Science and Technology，Wuhan 430074，China

Received:2021-08-21 Accepted:2021-09-06 Published:2021-10-01 Online:2021-10-15
Contact: Hai-Yan PENG,Xiao-Lin XIE
About author:xlxie@hust.edu.cn; hypeng@hust.edu.cn；
Supported by:
National Natural Science Foundation of China(51773073)

Abstract

Abstract:

Holographic polymer/liquid crystal （LC） composites are one type of structure ordered composites with the holographic function， which represent the unique capability of reconstructing the whole infomation of coherent lasers by using the periodically arranged polymer-rich and LC-rich phases. According to LC contents and preparation methods， holographic polymer/LC composites comprised holographic polymer dispersed liquid crystal （HPDLC）， holographic polymer stabilized liquid crystal （HPSLC）， and polymer-liquid-crystal-polymer slices （POLICRYPS）. This review mainly summarizes the methods to tune the structure and performance of HPDLC in recent 5 years， along with the research progress of HPSLC and POLICRYPS. Applications of holographic polymer/LC composites in high-tech fields such as advanced anti-counterfeiting and augmented reality are also highlighted. Last， research challenges and opportunities are proposed.

Key words: Liquid crystal, Polymer, Structure ordered composites, Holography, Anti-counterfeiting, Augmented reality

CLC Number:

O631

Dan WANG, Hai-Yan PENG, Xing-Ping ZHOU, Xiao-Lin XIE. Research Progress of Holographic Polymer/Liquid Crystal Composites[J]. Chinese Journal of Applied Chemistry, 2021, 38(10): 1268-1298.

Figures/Tables 31

Fig.1 Schematic illustration of fabricating HPDLC through photopolymerization induced phase separation［48］

Fig.2 Schematic illustration of effects of LC diffusion， nucleation and system gelation on phase separation structures of HPDLC［47］

Fig.3 （a）Schematic illustration of characterizing diffraction efficiency of transmission-type holographic gratings. （b） Photographs of diffraction and transmission spots［49］

Fig.4 Schematic illustration of （a） structure［51］ and （b） transmittance of reflection-type holographic gratings

Fig.5 Schematic diagram of electro-optic response of HPDLC［38］

Fig.6 （a） Proposed work principle of the KCD/NPG photoinitibitor； comparison of the KCD/NPG photoinitibitor with Irgacure 784/BPO photoinitiating system on （b） polymerization rate and （c） phase separation structure［11］. Phase separation structures were characterized by scanning electron microscopy （SEM） after LC removal with n-hexane

Fig. 7 （a） Proposed work principle of the RB/NPG photoinitibitor，（b） diffraction efficiency of HPDLC gratings against RB concentration，（c） SEM images showing HPDLC phase separation structures at different RB concentrations［57］

Fig.8 （a） Main products during photoreduction and photooxidation of KCD in the presence of NPG and TA， respectively； Comparison of （b） KCD/TA photoinitiating system with （c） KCD/NPG photoinitibitor on the regulation of phase separation structures of HPDLC［61-62］

Fig.9 Proposed inhibition mechanism of XAN［62］

Fig.10 Comparison of KCD/TA with KCD/TA/XAN on （a） polymerization rate，（b） photorheological behaviors and （c） phase separation structures of HPDLC［62］

Fig.11 Proposed photoreaction mechanism of the KCD/NPG/TA ternary photoinitiating system［63］

Fig.12 Comparison of KCD/NPG photoinitiator with KCD/NPG/TA ternary photoinitiating system on （a） polymerization rate，（b） photorheological behaviors and （c） phase separation structures of HPDLC［63］

Fig. 13 Schematic illustration on holographic photopolymerization mediated by the KCD/NPG photoinitibitor （left） and KCD/NPG/TA ternary photoinitiating system （right）［63］

Fig.14 Comparison of the KCD/NPG photoinitibitor with KCD/TA， KCD/TA/XAN and KCD/NPG/TA systems on （a） electro-optic response capability of HPDLC and （b—e） brightness of holographic images［62］

Fig.15 （a） Schematic illustration of fabricating HLCPDLC. Diffraction of HLCPDLC without electric field （b） and when applied 5 V/μm of electric field （c）. Polarized optical microscopy （POM） images without electric field （d） and when applied 5 V/μm of electric field （e）. Photographs of HLCPDLC samples at （f） 25 ℃ and （g） 44 ℃， respectively［78］

Fig. 16 Effects of 4OCB content on （a） the diffraction efficiency，（b） electro-optic response and （c） phase separation structure of HPDLC gratings［49，86］

Fig.17 （a） Schematic illustration of distribution of mercaptoethanol-capped ZnS nanoparticles in HPDLC. （b） Diffraction efficiency，（c） electro-optic response and （d） phase separation structures of HPDLC when varying ZnS content［75］

Fig. 18 （a） Schematic illustration of LC-ZnS distribution in HPDLC；（b） Electro-optic response，（c） light-scattering loss and （d） SEM images of HPDLC with varied weight ratios of LC-ZnS to P0616A［90］

Fig.19 （a） Schematic illustration of POSS distribution in HPDLC. （b） Diffraction efficiency and （c） electro-optic response of HPDLC doped with different POSS： H-1， without POSS； H-2， methacryl POSS； H-3， methacrylisobutyl POSS； H-4， aminopropylisobutyl POSS［91］

Fig. 20 （a， b） SEM images of UCNR-containing composites after LC removal；（c） Grating diffraction efficiency of HPDLC against UCNR content；（d） Upconversion emission intensity of composites as a function of UCNR content［95］

Fig. 21 Transmission electron microscopy images of （a） UCNR and （b） UCNP. Upconversion luminescence of （c） UCNR and （d） UCNP containing composites under 980 nm laser with a power of 20 W［95，98］

Fig.22（a） Schematic illustration and photos of reflection-type HPSNLC upon heating and cooling；（b） Transmittance， and （c） reflection efficiency of HPSNLC upon heating and cooling［106］

Fig. 23 （a） Schematic diagram of HPSCLC structure；（b） transmittance of PSCLC and HPSCLC under 130 V of applied voltage；（c） Transmittance of PSCLC and HPSCLC at the wavelength of 530 nm versus applied voltage［108］

Fig. 24 （a） Schematic illustration of fabricating HPSBPLC；（b） POM image of HPSBPLC；（c） Diffraction efficiency of HPSBPLC grating versus applied voltage；（d） Rise time and （e） decay time of HPSBPLC grating［118］

Fig.25 （a） Schematic illustration of structure，（b） POM image，（c） photograph，（d） reflection spectra of reflective POLICRYPS under zero and 3 V·μm-1 of electric field［126］

Fig.26 （a） Schematic illustration of structure change of azobenzene doped POLICRYPS under light；（b） POM image of azobenzene doped POLICRYPS；（c） Diffraction efficiency change of azobenzene doped POLICRYPS when turning on/off 532 nm pump light［128］.

Fig.27 （a） Construction of rhomboidal and hexagonal liquid crystalline metallacycles via self-assembly；

Fig.28 （a） Schematic illustration of dialing fluorescent emission of composites via LC phase transition and AIEgen's photocyclization；（b） Cooperative-thermoresponse of holographic and fluorescent images［9］

Fig.29 Orthogonal storage and display of holographic and upconversion emission images in composites［140］

Fig. 30 （a） Transmissive and （b） reflective HOEs for AR［13］；（c） MotoHUD AR product by DigiLens and （d） the work principle［14］

Fig. 31 （a） Schematic representation of optical pumping in distributed feedback laser［152］；（b） Output lasing spectrum with the inset showing vertical laser emission［148］

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Research Progress of Holographic Polymer/Liquid Crystal Composites

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