The assignee for this patent application is
Reporters obtained the following quote from the background information supplied by the inventors: "This disclosure relates in general to a process for making an electronic device. It further relates to the device made by the process.
"Electronic devices utilizing organic active materials are present in many different kinds of electronic equipment. In such devices, an organic active layer is sandwiched between two electrodes.
"One type of electronic device is an organic light emitting diode (OLED). OLEDs are promising for display applications due to their high power-conversion efficiency and low processing costs. Such displays are especially promising for battery-powered, portable electronic devices, including cell-phones, personal digital assistants, handheld personal computers, and DVD players. These applications call for displays with high information content, full color, and fast video rate response time in addition to low power consumption.
"Current research in the production of full-color OLEDs is directed toward the development of cost effective, high throughput processes for producing color pixels. For the manufacture of monochromatic displays by liquid processing, spin-coating processes have been widely adopted (see, e.g.,
"Several methods for providing ink containment are described in the literature. These are based on containment structures, surface tension discontinuities, and combinations of both. Containment structures are geometric obstacles to spreading: pixel wells, banks, etc. In order to be effective these structures must be large, comparable to the wet thickness of the deposited materials. When the emissive ink is printed into these structures it wets onto the structure surface, so thickness uniformity is reduced near the structure. Therefore the structure must be moved outside the emissive 'pixel' region so the non-uniformities are not visible in operation. Due to limited space on the display (especially high-resolution displays) this reduces the available emissive area of the pixel. Practical containment structures generally have a negative impact on quality when depositing continuous layers of the charge injection and transport layers. Consequently, all the layers must be printed.
"In addition, surface tension discontinuities are obtained when there are either printed or vapor deposited regions of low surface tension materials. These low surface tension materials generally must be applied before printing or coating the first organic active layer in the pixel area. Generally the use of these treatments impacts the quality when coating continuous non-emissive layers, so all the layers must be printed.
"An example of a combination of two ink containment techniques is CF.sub.4-plasma treatment of photoresist bank structures (pixel wells, channels). Generally, all of the active layers must be printed in the pixel areas.
"All these containment methods have the drawback of precluding continuous coating. Continuous coating of one or more layers is desirable as it can result in higher yields and lower equipment cost. There exists, therefore, a need for improved processes for forming electronic devices."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "There is provided a process for forming a contained second layer over a first layer, said process comprising: forming the first layer having a first surface energy; treating the first layer with a priming layer; exposing the priming layer patternwise with radiation resulting in exposed areas and unexposed areas; developing the priming layer to effectively remove the priming layer from either the exposed areas or the unexposed areas resulting in a first layer having a pattern of priming layer, wherein the pattern of priming layer has a second surface energy that is higher than the first surface energy; and forming the second layer on the pattern of priming layer by liquid deposition on the first layer.
"There is also provided a process for making an organic electronic device comprising an electrode having positioned thereover a first organic active layer and a second organic active layer, said process comprising: forming the first organic active layer having a first surface energy over the electrode; treating the first organic active layer with a priming layer; exposing the priming layer patternwise with radiation resulting in exposed areas and unexposed areas; developing the priming layer to effectively remove the priming layer from either the exposed areas or the unexposed areas resulting in a first active organic layer having a pattern of priming layer, wherein the pattern of priming layer has a second surface energy that is higher than the first surface energy; and forming the second organic active layer on the pattern of priming layer by liquid deposition on the first organic active layer.
"There is also provided an organic electronic device comprising a first organic active layer and a second organic active layer positioned over an electrode, and further comprising a patterned priming layer between the first and second organic active layers, wherein said second organic active layer is present only in areas where the priming layer is present.
"The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as defined in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
"Embodiments are illustrated in the accompanying figures to improve understanding of concepts as presented herein.
"FIG. 1 includes a diagram illustrating contact angle.
"FIG. 2 includes an illustration of an organic electronic device.
"FIG. 3 includes an illustration of part of an organic electronic device having a priming layer.
"Skilled artisans appreciate that objects in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the objects in the figures may be exaggerated relative to other objects to help to improve understanding of embodiments."
For more information, see this patent application: FENNIMORE, ADAM; Ziebarth, Jonathan M.; Radu,
Keywords for this news article include: Nanotechnology, Organic Electronic, Emerging Technologies,
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