OVJP Nozzle Array Patterning to Prevent OLED Perimeter Buildup
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Solution Overview
Problem
Existing techniques for fabricating organic light-emitting diodes (OLEDs) face challenges in effectively cleaning or preventing organic buildup around the periphery of the devices, which can affect performance and reliability.
Innovation Solution
A method involving organic vapor jet printing (OVJP) is used to deposit materials on a substrate, where a nozzle array with slots for inert gas and vacuum coupling is employed to remove excess material and prevent perimeter buildup, combined with mechanical peeling to pattern emissive regions and pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OLED fabrication techniques are used, then device manufacturing is simpler, but organic buildup accumulates around the periphery affecting performance and reliability
Solution Approach 1:
A peel-off mask is applied to the substrate before the OLED fabrication process to pre-define the active area boundaries. This preliminary action prevents organic material from depositing on the periphery during subsequent processing steps, eliminating the need for complex post-process cleaning operations while ensuring clean edges that improve device reliability.
Solution Approach 2:
The harmful organic buildup is extracted and removed through a dedicated peel-off mask layer that is selectively removed after the OLED device is formed. This extraction mechanism isolates and eliminates the peripheral organic contamination without affecting the central active area of the device, thereby improving reliability while maintaining processability.
2Manufacturing precision
If organic vapor jet printing is used to deposit materials, then deposition precision is improved, but material waste increases due to excess material removal
Solution Approach 1:
The organic vapor jet printing system incorporates real-time feedback control where the deposited material pattern is monitored and the printing process is adjusted accordingly. This feedback mechanism ensures precise material placement only where needed, reducing excess material deposition and subsequent waste while maintaining high patterning precision through controlled vapor phase deposition.
3Adaptability or versatility
If mechanical peeling is used to pattern emissive regions, then patterning capability is enhanced, but process complexity increases
Solution Approach 1:
The peel-off mask layer is integrated with the OLED fabrication process steps, merging the patterning function into the existing manufacturing sequence. By combining the mask application, material deposition, and selective removal into a unified process flow, the system enhances patterning capability while avoiding the addition of separate complex process steps.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves precise patterning and minimizes organic material accumulation, enhancing the efficiency and reliability of OLEDs by ensuring uniform deposition and reducing material waste.
Implementation Method 1
organic vapor jet printing (OVJP) is used to deposit materials on a substrate
Implementation Method 2
a nozzle array with slots for inert gas and vacuum coupling is employed to remove excess material
Implementation Method 3
slots for inert gas and vacuum coupling is employed to remove excess material
Data Source
AI summary
Embodiments of the disclosed subject matter provide a method of patterning a layer for an organic electronic device by depositing a material on a surface of a substrate, patterning a portion of the material that has been deposited on the surface of the substrate, forming a plurality of patterns on each of one or more electronic active areas of the substrate, and removing at least a portion of the material of the perimeter around the electronic active areas. Embodiments of the disclosed subject matter also provide depositing material onto a substrate using a nozzle array, interrupting a path of the material from the nozzle array at a first slot disposed on a first side of the nozzle array, and removing excess material deposited towards the substrate and evacuating material removed by the gas of the first slot using the second slot disposed on the second side of the nozzle array.