Nozzle design for organic vapor jet printing
a technology of organic vapor and nozzle, which is applied in the direction of vacuum evaporation coating, combustion types, lighting and heating apparatus, etc., can solve the problems of increasing overspray and causing the nozzle to diverge out of the beam, so as to increase overspray, reduce or increase the consistency
Inactive Publication Date: 2013-10-17
UNIVERSAL DISPLAY
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- Application Information
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Benefits of technology
This patent is about improving nozzle designs in a process called OVJP to reduce overspray. Nozzle designs that have sudden pressure drops at the end may cause the molecular beam to diverge and increase overspray. The invention reduces or avoids these sudden pressure drops, resulting in greater consistency between the nozzle outlet diameter and the deposited pattern width.
Problems solved by technology
It has been found that, in OVJP deposition, sudden pressure drops at the end of the nozzle close to the substrate may create a shock front, which may cause the molecular beam to diverge out from the nozzle and increase overspray.
Method used
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[0066]It is understood that the invention is not limited to the particular embodiments described herein, as these may vary as the skilled artisan will recognize. It is also to be understood that the terminology used herein is used for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention. It also is to be noted that as used herein and in the appended claims, the singular forms “a,”“an,” and “the” include the plural reference unless the context clearly dictates otherwise. Thus, for example, a reference to “a nozzle” is a reference to one or more nozzles and equivalents thereof known to those skilled in the art.
[0067]Unless defined otherwise, all technical terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the invention pertains. The embodiments of the invention and the various features and advantageous details thereof are explained more fully with reference to the non-li...
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Abstract
Nozzle designs which have been found to be effective in governing overspray in OVJP are provided. Aspects of the invention have been found to be effective in reducing or avoiding sudden pressure drops at the end of the nozzle close to the substrate, and may be advantageously employed in obtaining, for example, greater consistency between the nozzle outlet diameter and the deposited pattern width.
Description
FIELD OF THE INVENTION[0001]The present invention relates to the deposition of organic materials through a nozzle.BACKGROUND[0002]Opto-electronic devices that make use of organic materials are becoming increasingly desirable for a number of reasons. Many of the materials used to make such devices are relatively inexpensive, so organic opto-electronic devices have the potential for cost advantages over inorganic devices. In addition, the inherent properties of organic materials, such as their flexibility, may make them well suited for particular applications such as fabrication on a flexible substrate. Examples of organic opto-electronic devices include organic light emitting devices (OLEDs), organic phototransistors, organic photovoltaic cells, and organic photodetectors. For OLEDs, the organic materials may have performance advantages over conventional materials. For example, the wavelength at which an organic emissive layer emits light may generally be readily tuned with appropria...
Claims
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IPC IPC(8): B05B1/34B05D1/00
CPCB05B1/34B05D1/60H10K71/16C23C14/228C23C14/12C23C14/24B05B1/3402H10K71/164H10K71/00
Inventor HARIKRISHNA MOHAN, SIDDHARTHBURROWS, PAUL E.
Owner UNIVERSAL DISPLAY