5 results about "Discotic liquid crystal" patented technology

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 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.

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.