摘要:
Security documents often incorporate optically variable devices to prevent or hinder counterfeiters. Disclosed herein are layered optically variable devices such as colour-shift foils, and methods for their production and use. Such devices afford new techniques for a user of a security document to check quickly and easily whether the security document is a legitimate document or a counterfeit copy.
摘要:
Security documents often incorporate optically variable devices to prevent or hinder counterfeiters. Disclosed herein are layered optically variable devices such as color-shift foils, and methods for their production and use. Such devices afford new techniques for a user of a security document to check quickly and easily whether the security document is a legitimate document or a counterfeit copy.
摘要:
Security documents often incorporate optically variable devices to prevent or hinder counterfeiters. Disclosed herein are layered optically variable devices such as colour-shift foils that employ a piezoelectric layer, and methods for their production and use. Such devices afford new techniques for a user of a security document to check quickly and easily whether the security document is a legitimate document or a counterfeit copy by placing an electrical potential difference across the security document.
摘要:
A security device for authenticating bank notes, documents and other items, comprises a luminescent material for producing luminescent radiation of first and second wavelengths. The security device includes an optically variable structure for controlling emission of luminescent radiation of at least one of the first and second wavelengths from the security device, the security device being arranged to permit, from an area of the optically variable structure, emission of luminescence of the first and second wavelengths from the security device. The optically variable structure causes the relative emissivity of the security device for luminescent radiation of the first and second wavelengths to change with a change in emission angle, so that the security device produces an angle-dependent color shift in the emitted luminescent radiation. The optically variable structure may comprise an optical interference stack that controls transmission of luminescent radiation therethrough in response to the wavelength of luminescent radiation.
摘要:
Compositions are provided comprising aqueous dispersions of polythiophenes having homopolymers or co-polymers of Formula I(a) or Formula I(b) and at least one colloid-forming polymeric acid. Methods of making such compositions and using them in organic electronic devices are further provided.
摘要:
Processes for forming an electronic device include forming a first radiation region, a second radiation region spaced apart from the first radiation region, and an insulating region. The insulating region can have a first side and a second side opposite the first side. The first radiation region can lie immediately adjacent to the first side, and the second radiation region can lie immediately adjacent to the second side. Within the insulating region, no other radiation region may lie between the first and second radiation regions, and the insulating region can include an insulating layer that includes a plurality of openings. A process for forming the electronic device can include patterning an insulating layer.
摘要:
A security device for authenticating bank notes, documents and other items, comprises a luminescent material for producing luminescent radiation of first and second wavelengths. The security device includes an optically variable structure for controlling emission of luminescent radiation of at least one of the first and second wavelengths from the security device, the security device being arranged to permit, from an area of the optically variable structure, emission of luminescence of the first and second wavelengths from the security device. The optically variable structure causes the relative emissivity of the security device for luminescent radiation of the first and second wavelengths to change with a change in emission angle, so that the security device produces an angle-dependent colour shift in the emitted luminescent radiation. The optically variable structure may comprise an optical interference stack that controls transmission of luminescent radiation therethrough in response to the wavelength of luminescent radiation.
摘要:
An electronic device includes a substrate, a structure having openings, and a first electrode overlying the structure and lying within the openings. From a cross-sectional view, the structure, at the openings, has a negative slope. From a plan view, each opening has a perimeter that may or may not substantially correspond to a perimeter of an organic electronic component. The portions of the first electrode overlying the structure and lying within the openings are connected to each other. In a process for forming the electronic device, an organic active layer may be deposited within the opening, wherein the organic active layer has a liquid composition.
摘要:
Security documents often incorporate optically variable devices to prevent or hinder counterfeiters. Disclosed herein are layered optically variable devices such as colour-shift foils that employ a piezoelectric layer, and methods for their production and use. Such devices afford new techniques for a user of a security document to check quickly and easily whether the security document is a legitimate document or a counterfeit copy by placing an electrical potential difference across the security document.
摘要:
An electronic device includes a printed layer. In one embodiment, a process for forming the electronic device includes placing a workpiece over a chuck within a printing apparatus. A temperature difference is established between the workpiece and a liquid composition. The process further includes continuously printing the liquid composition over the workpiece. A viscosity of the liquid composition is allowed to increase at a rate significantly higher than an ambient viscosity increase rate. In another embodiment, the workpiece is allowed to cool to a temperature significantly below an ambient temperature before printing occurs. In still another embodiment, a printing apparatus is used for continuously printing the liquid composition over the workpiece. The printing apparatus includes the chuck, a printing head, a container, a feed line, and a first temperature-adjusting element thermally coupled to the chuck, the printing head, the container the feed line, or a combination thereof.