Linear Evaporation Apparatus for OLED Vapor Mixing
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Solution Overview
Problem
Conventional methods for forming OLED devices using single material linear sources are inefficient as they occupy too much space and do not effectively mix vapor for mixed host/dopant or multiple host systems, leading to undesirable layer deposition.
Innovation Solution
A linear evaporation apparatus with multiple crucibles and a vapor mixing chamber that heats materials to evaporation temperature, using vapor pressure-activated lids to mix and deposit a uniform flux of multiple hosts or host/dopant materials through a conductance chamber and linear output section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single material linear sources are used for OLED fabrication, then device formation is achieved, but space efficiency deteriorates and vapor mixing capability is lost
Solution Approach 1:
The patent combines multiple crucibles (holding different host or dopant materials) into a single linear evaporation source apparatus. Multiple materials are evaporated simultaneously from separate crucibles within one linear source, merging the functions of what would traditionally require multiple separate linear sources. This reduces the total space required while maintaining the capability to form complex OLED structures with multiple materials.
Solution Approach 2:
The single linear evaporation source is designed to perform multiple functions by accommodating several crucibles with different materials. The apparatus can deposit multiple hosts, host/dopant combinations, or layered structures through a unified device, making it a multi-functional tool that replaces several single-material sources and improves space efficiency.
2Manufacturing precision
If single material linear sources are used, then deposition is achieved, but vapor mixing for mixed host/dopant systems deteriorates
Solution Approach 1:
The linear source integrates multiple crucibles containing different materials (hosts, dopants) into a single evaporation system. The vapor paths from multiple crucibles converge and mix within the deposition chamber, enabling the formation of mixed host/dopant systems and multiple host configurations. This merging approach maintains precise deposition control while adding versatile vapor mixing capability.
3Adaptability or versatility
If multiple separate linear sources are used for mixed host/dopant systems, then material diversity is achieved, but space efficiency and uniformity deteriorate
Solution Approach 1:
The invention merges multiple material sources into a single linear evaporation apparatus by incorporating several crucibles within one device. This consolidation achieves the same material diversity as multiple separate sources while occupying significantly less space and improving deposition uniformity through a unified evaporation geometry.
4Adaptability or versatility
If multiple separate linear sources are used, then material variety is achieved, but deposition uniformity deteriorates
Solution Approach 1:
By combining multiple crucibles into a single linear source with unified evaporation geometry, the system maintains consistent deposition conditions across all material sources. The merged design ensures uniform flux distribution and coating quality, avoiding the uniformity issues that arise when using multiple separate linear sources positioned at different locations.
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 enables the deposition of uniform thin film layers with improved uniformity and space efficiency, addressing the limitations of conventional methods by allowing for the simultaneous evaporation and mixing of multiple materials into a single linear source deposition flux.
Implementation Method 1
heat the material to a corresponding material evaporation temperature
Implementation Method 2
vapor pressure activated lid configured to open at a predetermined material vapor pressure value generated by heating the crucibles
Implementation Method 3
conductance chamber including a linear output section configured to emit a linear source deposition flux therethrough
Implementation Method 4
evaporative vapor mixing chamber and a plurality of crucible-receiving apertures at distal ends from the evaporative vapor mixing chamber
Data Source
AI summary
A linear evaporation apparatus, system and method including a conductance chamber including a linear output section configured to emit a linear source deposition flux therethrough, an evaporative vapor communication conduit including an evaporative vapor mixing chamber and a plurality of crucible-receiving apertures at distal ends from the evaporative vapor mixing chamber, wherein the evaporative vapor mixing chamber is in communication with the conductance chamber and configured to transmit the linear source deposition flux therethrough, and a plurality of crucibles, each of the plurality of crucibles corresponding to one of the plurality of crucible-receiving apertures at the distal ends from the evaporative vapor mixing chamber, each of the plurality of crucibles configured to hold a material and heat the material to a corresponding material evaporation temperature, each of the plurality of crucibles further including a vapor pressure activated lid configured to open at a predetermined material vapor pressure value generated by heating the crucibles to at least the corresponding material evaporation temperature.