OLED Material Composition for Stable Multi-Component Co-Evaporation
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Solution Overview
Problem
Existing OLED devices require complex and costly fabrication processes due to the need for multiple evaporation sources to achieve stable co-evaporation of multiple components in the emissive layer, particularly when incorporating three or more components, which complicates the process and increases costs.
Innovation Solution
The use of a first compound with a structure of formula: in OLED devices, which addresses the need for multiple components in the emissive layer, allowing for stable co-evaporation from a single source, simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple evaporation sources are used to achieve stable co-evaporation of multiple components in the emissive layer, then the emission performance and color saturation are improved, but the device complexity and fabrication cost increase
Solution Approach 1:
The patent combines multiple evaporation sources into a single integrated evaporation source that can simultaneously deposit multiple components (host material, dopant, and blocking material) in one evaporation process. This merging approach maintains the emission performance and color saturation requirements while eliminating the need for multiple separate evaporation sources, thereby reducing device complexity and fabrication cost
Solution Approach 2:
The invention creates a multi-functional evaporation source capable of depositing different materials (host, dopant, blocking material) with different properties through a single device. This universal evaporation source performs multiple functions that previously required separate specialized sources, simplifying the overall fabrication system while maintaining precise control over material deposition for optimal emission performance
2Reliability
If multiple evaporation sources are used to achieve stable co-evaporation of multiple components, then the emission performance is improved, but the fabrication cost increases
Solution Approach 1:
By merging multiple evaporation sources into one integrated source, the patent reduces the total number of expensive vacuum deposition equipment pieces required. This consolidation maintains the ability to produce high-performance emissive layers with precise material ratios while significantly reducing capital equipment costs and operational expenses associated with running multiple separate evaporation processes
3Reliability
If three or more components are incorporated in the emissive layer, then the color saturation and emission performance are improved, but the fabrication process complexity increases
Solution Approach 1:
The patent merges the deposition of three or more components (host material, dopant, and blocking material) into a single simultaneous evaporation process using one integrated source. This approach maintains the color saturation and emission performance benefits of multi-component emissive layers while eliminating the sequential processing steps and alignment complexities that would arise from using multiple separate evaporation sources
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 reduces the complexity and cost of OLED device fabrication by enabling stable co-evaporation of multiple components from a single source, improving efficiency and reducing the number of evaporation sources required.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
enabling stable co-evaporation of multiple components from a single source
Implementation Method 3
stable co-evaporation from a single source, simplifying the fabrication process
Data Source
Figure 1
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Figure 3~4
AI summary
A composition of materials is disclosed, comprising a first compound having a formula: wherein G1 is selected from the group consisting of dibenzofuran, dibenzothiophene, dibenzoselenophene, and fluorene; wherein L1, L2 and L3 are each independently selected from the group consisting of direct bond, phenyl, biphenyl, terphenyl, pyridine, pyrimidine, and combinations thereof; wherein G4 is selected from the group consisting of phenyl, biphenyl, terphenyl, naphthalene, phenanthrene, pyridine, pyrimidine, pyrazine, quinoline, isoquinoline, phenanthroline, and combinations thereof; wherein G2, G3, and G5 are each independently selected from the group consisting of phenyl, biphenyl, terphenyl, fluorene, naphthalene, phenanthrene, pyridine, pyrimidine, pyrazine, quinoline, isoquinoline, phenanthroline, aza-fluorene, and combinations thereof; wherein G2, G3, G4, and G5 are each optionally further substituted with one or more unfused substituents selected from the group consisting of deuterium, alkyl, alkoxyl, cycloalkyl, cycloalkoxyl, halogen, nitro, nitrile, silyl, phenyl, biphenyl, terphenyl, pyridine, and combinations thereof.