Abstract: A switchable liquid crystal grating cell, and methods for manufacturing the above. The switchable liquid crystal grating cell comprises a pair of switchable liquid crystal grating parts, each switchable liquid crystal grating part comprises a substrate; a conductive layer on the substrate; and a photoalignment layer with an alignment pattern above the conductive layer on the substrate, the alignment pattern having first and second types of domains, the first type of domain having a first uniform alignment direction, the second type of domain having a second uniform alignment direction that is reoriented at a predetermined angle to the first uniform alignment direction, the predetermined angle is 85°-95°, and a liquid crystal layer sandwiched between the pair of switchable liquid crystal grating parts, wherein an alignment pattern on a top surface is arranged to be shifted relative to the other alignment pattern on a bottom surface.

Abstract: A switchable liquid crystal grating cell, and methods for manufacturing the above. The switchable liquid crystal grating cell comprises a pair of switchable liquid crystal grating parts, each switchable liquid crystal grating part comprises a substrate; a conductive layer on the substrate; and a photoalignment layer with an alignment pattern above the conductive layer on the substrate, the alignment pattern having first and second types of domains, the first type of domain having a first uniform alignment direction, the second type of domain having a second uniform alignment direction that is reoriented at a predetermined angle to the first uniform alignment direction, the predetermined angle is 85°-95°, and a liquid crystal layer sandwiched between the pair of switchable liquid crystal grating parts, wherein an alignment pattern on a top surface is arranged to be shifted relative to the other alignment pattern on a bottom surface.

Abstract: A light emitting device (LED) comprises a substrate, an anode layer disposed on the substrate, a hole injection layer disposed on the anode layer, a hole transport layer disposed on the hole injection layer, an emitting layer disposed on the hole transport layer, an electron transport layer disposed on the emitting layer, and a cathode layer disposed on the electron transport layer. At least one of the anode layer and the cathode layer is transparent. The emitting layer comprises a mixture of luminescent nanoparticles and an insulating material.

Abstract: Various photo-luminescent films and associated methods are enabled. For instance, a photo-luminescent film comprises a substrate layer comprising a plurality of pores, and a composite comprising luminescent nanoparticles disposed in the plurality of pores.

Abstract: One or more devices, systems, methods and/or apparatus to facilitate suppression of fringe field effect, such as for diffraction grating and/or display purposes. In one embodiment, a ferroelectric liquid crystal (FLC) element can comprise a pair of conductive substrates, a FLC layer having a helical pitch and positioned between the conductive substrates, one or more spacers fixedly positioned between the conductive substrates, and an alignment layer positioned between the FLC layer and one of the conductive substrates. The alignment layer can be disposed at least partially contiguous with the FLC layer. The FLC layer can comprise a chiral smectic C* liquid crystal layer having at least one of a helical pitch smaller than an average cell gap of the FLC layer, or an average helical pitch of the FLC layer being smaller than an average thickness of the FLC layer between the conductive substrates.

Abstract: Method of preparing a quantum rod nanocomposite, the method involving: combining a CdSe/CdS quantum rod, a metal ion catalyst, and a zinc precursor thereby forming a CdSe/CdxZn1-xS/ZnS quantum rod, wherein 0?X<1; optionally purifying the CdSe/CdxZn1-xS/ZnS quantum rod; combining the CdSe/CdxZn1-xS/ZnS quantum rod with an inorganic oxide precursor thereby forming an inorganic oxide encapsulated CdSe/CdxZn1-xS/ZnS quantum rod, wherein the CdSe/CdxZn1-xS/ZnS quantum rod is at least partially encapsulated by an inorganic oxide coating; and optionally combining the inorganic oxide encapsulated CdSe/CdxZn1-xS/ZnS quantum rod with a binder thereby forming a binder coated inorganic oxide encapsulated CdSe/CdxZn1-xS/ZnS quantum rod and curing the binder thereby forming the quantum rod nanocomposite.

Abstract: A ferroelectric liquid crystal (FLC) material in a vertically aligned liquid crystal cell, comprising at least one chiral compound and at least one non-chiral liquid crystal compound, with a sub-micron scale helix pitch less than 300 nm, spontaneous polarization greater than 100 nC/cm2, and a tilt angle greater than 38 degrees. The ferroelectric liquid crystal (FLC) material provides an extremely large Kerr constant in a vertically aligned liquid crystal cell at the communication band of the light and therefore reduces the driving voltage and response time.

Abstract: Techniques for using ferroelectric liquid crystals Dammann grating (FLCDG) for light detection and ranging devices are disclosed. In LiDAR devices, accuracy, response time, and cost performance can be limited by some factors, such as laser pulse width, time resolution of a time-to-digital conversion chip, detector bandwidth, shot noise, and time error generated by electronic circuits. A FLCDG-based architecture can improve a LiDAR device, and provide for one-shot capturing due to the high switching speed at very low driving voltage provided by ferroelectric liquid crystals and the equal diffracting ability of Dammann grating.

Abstract: There is provided a ferroelectric liquid crystal (FLC) material for the deformed helix FLC (DHFLC) electro-optical mode devices and shows optimum electro-optical properties including high tilt angle (>38°), and short helix pitch (<120 nm), and spontaneous polarization (>100 nC/cm2) comprising at least two components, wherein at least one FLC component is a chiral compound of Formula (I): particularly: wherein W1 and W2 are chiral groups with polar substituent at chiral centre, A and B are independently N atom or CH groups providing that at least one of A or B is N atom. Other various groups are as defined herein.

Abstract: One or more devices, systems, methods and/or apparatus to facilitate suppression of fringe field effect, such as for diffraction grating and/or display purposes. In one embodiment, a ferroelectric liquid crystal (FLC) element can comprise a pair of conductive substrates, a FLC layer having a helical pitch and positioned between the conductive substrates, one or more spacers fixedly positioned between the conductive substrates, and an alignment layer positioned between the FLC layer and one of the conductive substrates. The alignment layer can be disposed at least partially contiguous with the FLC layer. The FLC layer can comprise a chiral smectic C* liquid crystal layer having at least one of a helical pitch smaller than an average cell gap of the FLC layer, or an average helical pitch of the FLC layer being smaller than an average thickness of the FLC layer between the conductive substrates.

Abstract: A nanoparticle film is disclosed. The nanoparticle film comprises a plurality of polymerized liquid crystal monomers having an axis of alignment, and a plurality of nanoparticles disposed in the polymerized liquid crystal monomers. Each of the nanoparticles has a surface modified by a plurality of first ligands and a long axis aligned with the axis of alignment through the plurality of first ligands.

Abstract: A composite photoalignment layer for aligning liquid crystal molecules includes: a monomeric material; a photoinitiator or a thermal initiator; and an azo dye material. A method for preparing a composite photoalignment layer for aligning liquid crystal molecules includes: mixing, in solution form, a monomeric material, a photoinitiator or a thermal initiator, and an azo dye material; coating the mixed solution onto a substrate to form a thin film; exposing the thin film to polarized light; and, with a thermal initiator, heating the thin film to polymerize the monomeric material and form a solid thin film.

Abstract: A method for production of quantum rods is semiconductor luminescent nanoparticles of elongated shape. The semiconductor luminescent nanoparticles are core-shell nanoparticles, where core is CdSe coated with CdS shell. At the current state of the art, mass production of this type of quantum rods is challenging because of extremely fast growth of wurtzite CdSe seeds serving as the core, especially when the seeds size is below 3.0 nm that is required for synthesis of green emitting QRs. We propose the non-injection method for CdSe-seeds which comprises: preparation of single reaction mixture containing both Cd- and Se-precursors, which is liquid at room temperature: pumping the reaction mixture through the heating zone specially designed to provide highly reproducible and well-controllable residential time (0.1-60 seconds) in a heating chamber, thereby resulting in CdSe seeds with low size distribution and narrow emission bandwidth; synthesis of quantum rods using the prepared CdSe seeds.

Abstract: A method for fabricating quantum rods includes: preparing a Cd-precursor; preparing a S-precursor and CdSe seeds; preparing a Zn-precursor; mixing the S-precursor and the CdSe seeds with the Cd-precursor in a reaction mixture; adding the Zn-precursor to the reaction mixture; stopping the reaction; and performing a purification process to obtain the quantum rods.

Abstract: Various photo-luminescent films and associated methods are enabled. For instance, a photo-luminescent film comprises a substrate layer comprising a plurality of pores, and a composite comprising luminescent nanoparticles disposed in the plurality of pores.

Abstract: A low birefringence ferroelectric liquid crystal (FLC) mixture composed of at least two components shows birefringence in the range 0.05 to 0.14, which is suitable for the modern display and photonic devices. The cell gap can be tuned from 1.5 ?m to 4 ?m to reduces the fabrication complexity and chromatic distortion by electro-optical modulation. The FLC mixtures can be employed in a wide temperature range. The characteristics of the said FLC mixture can be tuned by tuning the concentration of the constituents of the mixture. The helical pitch of the FLC mixtures can be varied from 100 nm to 10 ?m. A smectic tilt angle can be varied between 17° to 45° and the spontaneous polarization can be tuned over a wide range to meet requirements of different electro-optical modes, and the FLC mixture is applicable for a wide variety of electro-optical effects.

Abstract: A photoaligned quantum rod enhancement film (QREF) includes: a substrate (802, 805); a photoalignment layer deposited on the substrate (802, 805); and a polymer layer deposited on the photoalignment layer, the polymer layer comprises a plurality of quantum rods, the plurality of quantum rods are configured to emit one or more wavelengths of light in response to pumping light, and are aligned to an alignment axis based on the photoalignment layer.

Abstract: Techniques for using ferroelectric liquid crystals Dammann grating (FLCDG) for light detection and ranging devices are disclosed. In LiDAR devices, accuracy, response time, and cost performance can be limited by some factors, such as laser pulse width, time resolution of a time-to-digital conversion chip, detector bandwidth, shot noise, and time error generated by electronic circuits. A FLCDG-based architecture can improve a LiDAR device, and provide for one-shot capturing due to the high switching speed at very low driving voltage provided by ferroelectric liquid crystals and the equal diffracting ability of Dammann grating.

Abstract: A nanoparticle film is disclosed. The nanoparticle film comprises a plurality of polymerized liquid crystal monomers having an axis of alignment, and a plurality of nanoparticles disposed in the polymerized liquid crystal monomers. Each of the nanoparticles has a surface modified by a plurality of first ligands and a long axis aligned with the axis of alignment through the plurality of first ligands.

Abstract: A composite photoalignment layer for aligning liquid crystal molecules includes: a monomeric material; a photoinitiator or a thermal initiator; and an azo dye material. A method for preparing a composite photoalignment layer for aligning liquid crystal molecules includes: mixing, in solution form, a monomeric material, a photoinitiator or a thermal initiator, and an azo dye material; coating the mixed solution onto a substrate to form a thin film; exposing the thin film to polarized light; and, with a thermal initiator, heating the thin film to polymerize the monomeric material and form a solid thin film.