Abstract:
The present invention provides light-emitting diode (LED) devices comprises compositions and containers of hermetically sealed luminescent nanocrystals. The present invention also provides displays comprising the LED devices. Suitably, the LED devices are white light LED devices.
Abstract:
Methods, systems, and apparatuses for electronic devices having improved gate structures are described. An electronic device includes at least one nanowire. A gate contact is positioned along at least a portion of a length of the at least one nanowire. A dielectric material layer is between the gate contact and the at least one nanowire. A source contact and a drain contact are in contact with the at least one nanowire. At least a portion of the source contact and/or the drain contact overlaps with the gate contact along the nanowire the length. In another aspect, an electronic device includes a nanowire having a semiconductor core surrounded by an insulating shell layer. A ring shaped first gate region surrounds the nanowire along a portion of the length of the nanowire. A second gate region is positioned along the length of the nanowire between the nanowire and the substrate. A source contact and a drain contact are coupled to the semiconductor core of the nanowire at respective exposed portions of the semiconductor core.
Abstract:
The present invention is directed to methods to harvest, integrate and exploit nanomaterials, and particularly elongated nanowire materials. The invention provides methods for harvesting nanowires that include selectively etching a sacrificial layer placed on a nanowire growth substrate to remove nanowires. The invention also provides methods for integrating nanowires into electronic devices that include placing an outer surface of a cylinder in contact with a fluid suspension of nanowires and rolling the nanowire coated cylinder to deposit nanowires onto a surface. Methods are also provided to deposit nanowires using an ink-jet printer or an aperture to align nanowires. Additional aspects of the invention provide methods for preventing gate shorts in nanowire based transistors. Additional methods for harvesting and integrating nanowires are provided.
Abstract:
The present invention provides matrixes doped with semiconductor nanocrystals. In certain embodiments, the semiconductor nanocrystals have a size and composition such that they absorb or emit light at particular wavelengths. The nanocrystals can comprise ligands that allow for mixing with various matrix materials, including polymers, such that a minimal portion of light is scattered by the matrixes. The matrixes of the present invention can also be utilized in refractive index matching applications. In other embodiments, semiconductor nanocrystals are embedded within matrixes to form a nanocrystal density gradient, thereby creating an effective refractive index gradient. The matrixes of the present invention can also be used as filters and antireflective coatings on optical devices and as down-converting layers. The present invention also provides processes for producing matrixes comprising semiconductor nanocrystals.
Abstract:
Embodiments of a device and a method of tuning white point values of light distributed by a backlight unit (101) of a display device (200) are described. The device includes a backlight unit (101), an image generating unit (106), and a patterned layer (240). The backlight unit (101) includes a light source unit (102) and an optical processing unit (104) having a quantum dot film (114) coupled to the light source unit (102). The image generating unit (106) includes a display screen (126). The backlight unit (101) is configured to distribute light to the display screen (126) and the patterned layer (240) is configured to tune white point values of the distributed light to a desired white point value in order to achieve substantially uniform white point values across the display screen.
Abstract:
Embodiments of a display device (300) and a method of reducing optical leakage from a backlight unit (202) of a display device (300) are described. The display device (300) includes a backlight unit (202, 208, 204), an image generating unit (206) coupled to the backlight unit and a blocking structure (334a-334e). The backlight unit (202, 208, 204) includes a light source unit (202) such as a blue LED and an optical processing unit (204) that comprises a quantum dot film (214) and optical sheets (222, 216). The backlight unit (202, 208, 204) is configured to transmit light to the image generating unit (206); the blocking structure (334a-334e) is configured to prevent the light from reaching the image generating unit without passing through the optical processing unit. The blocking structure (334a-334e) may consist of light-shielding tape, tabs or paint arranged along the periphery of the light guide plate (212), the optical sheets (22, 216) and the quantum dot film (214).
Abstract:
Highly luminescent nanostructures, particularly highly luminescent quantum dots, are provided. The nanostructures have high photoluminescence quantum yields and in certain embodiments emit light at particular wavelengths and have a narrow size distribution. The nanostructures can comprise ligands, including C5-C8 carboxylic acid ligands employed during shell formation and/or dicarboxylic or polycarboxylic acid ligands provided after synthesis. Processes for producing such highly luminescent nanostructures are also provided, including methods for enriching nanostructure cores with indium and techniques for shell synthesis.
Abstract:
Methods and apparatuses for electronic devices such as non-volatile memory devices are described. The memory devices include a multi-layer control dielectric, such as a double or triple layer. The multi-layer control dielectric includes a combination of high-k dielectric materials such as aluminum oxide, hafnium oxide, and/or hybrid films of hafnium aluminum oxide. The multi-layer control dielectric provides enhanced characteristics, including increased charge retention, enhanced memory program/erase window, improved reliability and stability, with feasibility for single or multi state (e.g., two, three or four bit) operation.
Abstract:
Methods of doping nanostructures, such as nanowires, are disclosed. The methods provide a variety of approaches for improving existing methods of doping nanostructures. The embodiments include the use of a sacrificial layer to promote uniform dopant distribution within a nanostructure during post-nanostructure synthesis doping. In another embodiment, a high temperature environment is used to anneal nanostructure damage when high energy ion implantation is used. In another embodiment rapid thermal annealing is used to drive dopants from a dopant layer on a nanostructure into the nanostructure. In another embodiment a method for doping nanowires on a plastic substrate is provided that includes depositing a dielectric stack on a plastic substrate to protect the plastic substrate from damage during the doping process. An embodiment is also provided that includes selectively using high concentrations of dopant materials at various times in synthesizing nanostructures to realize novel crystallographic structures within the resulting nanostructure.
Abstract:
Nanoparticle compositions for use as solder, and methods for joining two or more material surfaces using nanoparticle solder compositions are described. Due to their small size, nanoparticles of a particular material have a lower melting temperature than the same material in bulk, thereby providing a homogenous bond between two or more materials when the nanoparticle solder is solidified. A gas species, such as hydrogen, can be introduced to further lower the melting temperature of the nanoparticles. The nanoparticles can also be used to form films on low melting point, substrates, including flexible substrates. The nanoparticles for use in the present invention can comprise any material, including semiconductor materials, metals, or insulator materials, and are less than about 20 nm in diameter, although larger sizes can also be used.