11 results about "Discotic liquid crystal" patented technology

The present invention addresses the problem of providing an optical filter and an optical system using a liquid crystal polarization interference element which, when used for a band-pass filter or the like, can inhibit fluctuation in the wavelength of light exhibiting a maximum transmittance even when the light is incident from an oblique direction. The problem is solved by the configuration in which the liquid crystal polarization interference element includes two or more sets each made up of a first liquid crystal layer and a second liquid crystal layer, the first liquid crystal layer and the second liquid crystal layer including a liquid crystal layer R obtained by fixing a horizontally arrayed rod-shaped liquid crystal compound and a liquid crystal layer D obtained by fixing a vertically arrayed discoid liquid crystal compound. The liquid crystal layer R and the liquid crystal layer D have parallel slow axes and equal in-plane retardation. Furthermore, the in-plane slow axes of the first liquid crystal layer and the second liquid crystal layer intersect each other.

The invention relates to ink and a light-emitting device. The ink comprises a solvent, and an organic luminescent material and a discotic liquid crystal material which are dispersed in the solvent. According to the ink, the wettability of the ink on the surface of a substrate can be improved by adding the discotic liquid crystal material, the substrate can be more uniformly coated with the ink, the uniformity of a thin film is enhanced, and the discotic liquid crystal material has self-assembly capacity and can promote molecular arrangement and accumulation in the thin film forming process, so that the compactness and quality of the thin film are improved.

The present invention addresses the problem of providing an optical filter using a liquid crystal polarization interference element capable of suppressing variation in the wavelength at which maximum transmittance of light is exhibited even when the light is incident from an oblique direction, and to provide an optical system using the optical filter. The above problem is solved by a configuration in which a liquid crystal polarization interference element has two or more sets comprising a first liquid crystal layer and a second liquid crystal layer, the first liquid crystal layer and the second liquid crystal layer including a liquid crystal layer R in which a horizontally aligned rod-shaped liquid crystal compound is fixed and a liquid crystal layer D in which a vertically aligned discoid liquid crystal compound is fixed, the liquid crystal layer R and the liquid crystal layer D having parallel slow axes and equal in-plane retardation, and the in-plane slow axes of the first liquid crystal layer and the second liquid crystal layer intersecting.

This invention relates to the field of organic photovoltaic (PV) device technology, specifically to an organic PV device based on disk-shaped liquid crystal molecules, its fabrication method, and its applications. The organic PV device based on disk-shaped liquid crystal molecules provided by this invention comprises an anode substrate, a hole transport layer, an active layer, an electron transport layer, and a metal cathode stacked sequentially. The active layer is composed of a donor material, an acceptor material, and a benzo[a]phenanthrene disk-shaped liquid crystal derivative. The benzo[a]phenanthrene disk-shaped liquid crystal derivative self-assembles into a two-dimensional columnar superlattice nanostructure. The benzo[a]phenanthrene disk-shaped liquid crystal derivative has the structure shown in Formula I and / or Formula II, where R1 and R2 independently comprise a cycloalkane-furanyl or adamantyl group. Based on the self-assembly behavior of the benzo[a]phenanthrene disk-shaped liquid crystal derivative, this invention constructs an ordered columnar superlattice structure by controlling its steric hindrance and dipole interactions, significantly improving the charge transport efficiency and energy conversion efficiency of the device.

The present invention addresses the problem of providing a circularly polarizing plate and an organic EL display device capable of improving the visibility of black from an oblique direction. A circularly polarizing plate according to the present invention which has, in this order, a linear polarizer, a first optically anisotropic layer, a second optically anisotropic layer, a third optically anisotropic layer, and a fourth optically anisotropic layer, wherein: both the first optically anisotropic layer and the fourth optically anisotropic layer satisfy formula (1); the second optically anisotropic layer satisfies formula (2); and the third optically anisotropic layer is obtained by immobilizing a twisted-alignment discotic liquid crystal compound in which the thickness direction is the axis of twisting.　Formula (1): nx=ny>nz, formula (2): nz=nx>ny

The invention belongs to the field of organic material chemistry, and discloses a preparation method and properties of X-type rigid bridging pyrene-triphenylene quadruplex discotic liquid crystal, and the X-type rigid bridging pyrene-triphenylene quadruplex discotic liquid crystal has a structure as shown in a general formula I. The compound shown in the general formula I is mainly synthesized from a pyrene tetraborate compound and a monobromobenzophenanthrene derivative through Suzuki-Miyaura cross coupling, the reaction condition is mild, the steps are simple and efficient, and the atom utilization rate is high. The compound has thermotropic liquid crystal property, the intermediate phase is a columnar phase (Col) and a nematic phase (N), the melting point and clearing point of the discotic liquid crystal compound are improved by introducing a rigid ring serving as a bridge, the temperature range of the liquid crystal intermediate phase is widened, the variety is enriched, and meanwhile, the compound has good fluorescence emission and quantum yield in a solution and a film aggregation state. The maximum responsivity of the organic photoconductive detector prepared by taking the Py-TP6 as the absorption layer is 1.25 A / W (the power is 1.18 mW / cm < 2 >), 2.40 A / W (the power is 1.52 mW / cm < 2 >) and 9.23 A / W (the power is 0.63 mW / cm < 2 >) at the wavelength of 405 nm, 532 nm and 650 nm respectively.

The invention relates to a high-thermal-conductivity and low-dielectric composite material capable of being dynamically repaired and a preparation method and application thereof, and belongs to the technical field of electronic advanced packaging and high-frequency substrate thermal management materials. According to the invention, a traditional hydroxyl-containing binder is abandoned, and a boron-oxygen-six-ring-crosslinked 3D boron nitride bidirectional orientation skeleton is constructed in situ by using a self-condensation reaction of a boric acid precursor under bidirectional freeze concentration; meanwhile, novel polysiloxane with a discotic liquid crystal side chain and a dynamic borate network is synthesized; a vacuum-pressure alternating auxiliary impregnation process is utilized to induce the disc-shaped liquid crystal to be assembled on the surface of a framework in an epitaxial manner, and in-situ addition curing without byproducts is carried out. According to the invention, the industrial pain points that the traditional packaging material cannot give consideration to Z-axis high thermal conductivity, high-frequency ultralow dielectric loss and unreworkable property after curing are overcome, and the packaging material is especially suitable for the fields of 5G / 6G high-frequency communication and 2.5 D / 3D Chiplet advanced system-level packaging.

A liquid crystal polarization interference element is provided that suppresses fluctuation in the wavelength at which maximum transmittance occurs, even when light is incident at an oblique angle. The element includes two or more sets of liquid crystal layers, each set having a first liquid crystal layer and a second liquid crystal layer. Each of the first and second liquid crystal layers includes a liquid crystal layer R formed by immobilizing horizontally aligned rod-like liquid crystal compounds and a liquid crystal layer D formed by immobilizing vertically aligned disk-like liquid crystal compounds. The liquid crystal layer R and the liquid crystal layer D have parallel slow axes and equal in-plane retardations, and the first liquid crystal layer and the second liquid crystal layer have in-plane slow axes that intersect each other. An optical filter including the liquid crystal polarization interference element is also provided.

The invention belongs to the field of organic material chemistry, and discloses a preparation method and properties of star-like graphene conjugated bridged benzophenanthrene discotic liquid crystals, and the star-like graphene conjugated bridged benzophenanthrene discotic liquid crystals have structures shown in general formulas I, II and III. The compounds as shown in the general formulas I, II and III are mainly synthesized from a polybrominated hexaphenylbenzene compound and a benzophenanthrene borate derivative through Suzuki-Miyaura cross-coupling, the steps are simple and efficient, the atom utilization rate is high, and the yield is stable. The compounds have reversible thermotropic liquid crystal properties, most of the mesophases are hexagonal (Colh) and rectangular (Colr) columnar phases, the melting point and clearing point of the concatemer compounds are effectively improved through expansion of the conjugation degree and introduction of ortho-position methyl, the temperature range of the liquid crystal mesophases is widened, the types of the liquid crystal mesophases are enriched, and the compounds have rich self-assembly morphologies in organic solvents. Meanwhile, good fluorescence emission and absolute quantum yield are achieved in a solution and a thin film aggregation state, and the maximum emission wavelength and the maximum quantum yield in the solution are 401-409 nm and 63.89% respectively (the maximum emission wavelength and the maximum quantum yield in the aggregation state are 415-434 nm and 61.38% in the aggregation state).

The present disclosure provides a light-emitting device, a manufacturing method thereof, and a display device. The light-emitting device includes a composite hole transport layer. The composite hole transport layer includes a matrix and a discoidal liquid crystal component. The hole mobility of the discotic liquid crystal component is greater than the hole mobility of the matrix.

The objective of the present invention is to solve the problem of providing: a laminated optical element that, when used in a bandpass filter or the like that supports multiple wavelengths, can suppress fluctuations in the wavelength of light exhibiting maximum transmittance, even in cases where the light is incident from an oblique direction; an optical filter using said laminated optical element; and an optical system using said laminated optical element. The problem is solved by including two or more pairs each comprising a first liquid crystal layer and a second liquid crystal layer, the first and / or second liquid crystal layer including a liquid crystal layer in which a rod-like liquid crystal compound is fixed in place and / or a liquid crystal layer in which a discotic liquid crystal compound is fixed in place, the first and second liquid crystal layers having a plurality of liquid crystal polarization interference elements with intersecting in-plane slow phase axes and equal in-plane retardation, and furthermore, the liquid crystal polarization interference elements having mutually different total in-plane retardations in the first liquid crystal layer.