Fabrication of highly efficient coatable polarizer from tolane-based smectic reactive mesogen

Security use of bilayer dichroic films made of liquid crystal polymer networks

“…As a result, as θ changed from 0°to 90°, the observed transmission color of each film changed from red and cyan to almost transparent. These results are the same as those for the conventional dichroic dye-doped LC films [1][2][3][4][5][6][7][12][13][14][15][16][17][18][19]. However, when their optical axes were stacked in a crossed manner, the transmission color changed differently from that of the single-layer film (Figure 2(a,d)).…”

“…In this study, a reactive mesogen that showed both nematic and smectic phases was used to fabricate the LC films (Figure 1(b,c)). It has been reported in previous studies [2,4] that when a reactive mesogen is polymerized in the smectic phase, its optical properties and molecular alignment are significantly improved compared to the film polymerized in the nematic phase.…”

“…Polarization-dependent liquid crystal (LC) films have been applied in broad fields, including in LC polarizers [1][2][3][4][5], photo-luminescence films [6][7][8], and photonic crystals [9][10][11]. Among these, dye-doped LC films composed of coaligned LC polymer networks and dichroic dyes attract interest among researchers due to their novel optical property and efficient fabrication process [1][2][3][4][5][6][7][12][13][14][15][16][17][18][19]. These films, also called 'host-guest LC films,' absorb maximum light when the polarization direction of the incident linear polarized light (LPL) and the absorption axes of the dichroic dyes are parallel.…”

“…These films, also called 'host-guest LC films,' absorb maximum light when the polarization direction of the incident linear polarized light (LPL) and the absorption axes of the dichroic dyes are parallel. Using this unique property, this platform has been studied for diverse applications such as light-responsive polymers [14,15], smart window [16,17], and coatable polarizers [3,4].…”

P‐11.3: Development of coating polarizer based on polymerizable liquid crystal monomer and dichroic dye

“…The photoalignment dichroic dye type polarizer possesses high polarization performance at specific wavelength, but also suffering from the limited wavelength range as well as the inferior stabilities. In this work, we are developing the guest-host type coating polarizer by using the polymerizable liquid crystal monomer as the "host" material and dichroic dye as the "guest" material [4]. Upon guesthost effect, the host polymerizable liquid crystal molecules are firstly uniaxially aligned in the existence of alignment layer, the premixed dichroic dye molecules will be co-aligned by the intermolecular interaction.…”