Abstract:
A method is provided. A first layer is provided over a substrate, the first layer comprising a first material. A patterned second layer is applied over the first layer via stamping. The second layer comprising a second material. The second layer covers a first portion of the first layer, and does not cover a second portion of the first layer. The second portion of the first layer is removed via a subtractive process while the first portion of the first layer is protected from removal by the patterned second layer.
Abstract:
A method of fabricating a photoactive array having an integrated backplane is provided. The layers of the device may be stamped or deposited on a planar or a curved substrate, such as a semispherical or ellipsoidal substrate. Each metal layer may be stamped using an elastomeric stamp and a vacuum mold. By depositing the patterned and full-surface layers in a single process, a photosensitive array with an integrated transistor backplane may be fabricated, resulting in improved sensitivity and performance.
Abstract:
A first device is provided. The first device includes an organic light emitting device, which further comprises a first electrode, a second electrode, and an organic emissive layer disposed between the first and second electrode. Preferably, the second electrode is more transparent than the first electrode. The organic emissive layer has a first portion shaped to form an indentation in the direction of the first electrode, and a second portion shaped to form a protrusion in the direction of the second electrode. The first device may include a plurality of organic light emitting devices. The indentation may have a shape that is formed from a partial sphere, a partial cylinder, a pyramid, or a pyramid with a mesa, among others. The protrusions may be formed between adjoining indentations or between an indentation and a surface parallel to the substrate.
Abstract:
Novel combination of materials and device architectures for organic light emitting devices is provided. An organic light emitting device, is provided, having an anode, a cathode, and an emissive layer disposed between the anode and the cathode. The emissive layer includes a host and a phosphorescent emissive dopant having a peak emissive wavelength less than 500 nm, and a radiative phosphorescent lifetime less than 1 microsecond. Preferably, the phosphorescent emissive dopant includes a ligand having a carbazole group.
Abstract:
Devices including organic and inorganic LEDs are provided. Techniques for fabricating the devices include fabricating an inorganic LED on a parent substrate and transferring the LED to a host substrate via a non-destructive ELO process. Scaling techniques are also provided, in which an elastomeric substrate is deformed to achieve a desired display size.
Abstract:
Systems and methods including bonding two or more separately formed circuit layers are provided using, for example, cold welding techniques. Processing techniques may be provided for combining inorganic and/or organic semiconductor devices in apparatus including, for example, microchips, optoelectronic devices, such as solar cells, photodetectors and organic light emitting diodes (OLEDs), and other apparatus with multi-layer circuitry. Methods of bonding preformed circuit layers may include the use of stamping and pressure bonding contacts of two or more circuit layers together. Such methods may find applicability, for example, in bonding circuitry to shaped substrates, including various rounded and irregular shapes, and may be used to combine devices with different structural properties, e.g. from different materials systems.
Abstract:
A patterned roller, and a method of making the patterned roller, is provided. A patterned roller may be made by first forming a first mold having a negative pattern in a flat surface by etching. A second mold is formed having a positive pattern, by pouring a first curable material into the first mold and processing. The patterned roller having the negative pattern is formed by coating a roller with a layer of a second curable material, pre-curing the second curable material, and rolling the roller over the second mold. The second curable material is then cured. A metal coating may be applied after curing any of the materials to reduce sticking in subsequent steps. The patterned roller may be used to create a pattern of microlenses in a third curable material by rolling.
Abstract:
Organic photovoltaic cells (OP Vs) and their compositions are described herein. In one or more embodiments, the OPV or solar cell includes a first electrode (e.g., cathode); a second electrode (e.g., anode); an active layer positioned between the first electrode and the second electrode; and a channel layer positioned between the first electrode and the active layer, wherein the channel layer is configured to laterally disperse a charge across the channel layer. In certain examples, the first electrode is arranged in a grid structure having a plurality of electrode segments and a respective opening between adjacent segments of the first electrode.
Abstract:
Doping metal oxide charge transport material with an organic molecule lowers electrical resistance while maintaining transparency and thus is optimal for use as charge transport materials in various organic optoelectronic devices such as organic photovoltaic devices and organic light emitting devices.