Organic Compound Intermediate Layer for Heat-Resistant OLED Lithography
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Solution Overview
Problem
Existing methods for forming organic semiconductor films face limitations in resolution and precision due to issues with mask vapor deposition, and lithography methods lead to degradation and defects, particularly when exposed to air and high temperatures.
Innovation Solution
Development of an organic compound with a spiro[5H-cyclopenta[2,1-b:3,4-b']dipyridine-5,9'-fluorene] skeleton and aliphatic cyclic amine groups, suitable for use in intermediate layers of light-emitting devices, which maintains electron-transport properties and enhances heat resistance, allowing for high-quality film formation even through photolithography processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mask vapor deposition is used to form organic semiconductor film, then manufacturing precision is improved, but manufacturing precision deteriorates due to positioning precision problems and substrate-mask arrangement interval limitations
Solution Approach 1:
The patent introduces an intermediary layer (photoresist or other light-sensitive material) between the light source and the organic semiconductor film. This intermediary layer absorbs the light and transfers energy to the film, enabling lithography-based patterning without direct substrate-mask contact, thus resolving the positioning precision and arrangement interval limitations of mask vapor deposition
Solution Approach 2:
The patent replaces the mechanical mask vapor deposition system with a photolithography system using light sources and photo-sensitive materials. This substitution eliminates the mechanical positioning and physical contact issues inherent in mask-based methods, achieving finer pattern formation through optical processes
2Manufacturing precision
If lithography method is used to form organic semiconductor film, then manufacturing precision is improved, but reliability deteriorates due to degradation and shape defects from air exposure and high-temperature baking
Solution Approach 1:
The patent performs the lithography process and subsequent processing steps in an inert atmosphere (nitrogen or rare gas environment) to prevent air exposure of the organic semiconductor film. This inert environment eliminates oxidation and degradation during the vulnerable post-exposure period, maintaining film stability and preventing shape defects while enabling high-resolution patterning
Solution Approach 2:
The patent applies a protective coating or encapsulation layer over the organic semiconductor film before lithography processing. This preliminary protective action shields the film from air exposure and high-temperature effects during subsequent processing steps, preventing degradation while allowing the benefits of lithography-based precision patterning
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
The organic compound enables the production of light-emitting devices with improved heat resistance, reliability, and reduced driving voltage, while maintaining favorable characteristics despite exposure to air and high temperatures.
Implementation Method 1
an organic compound layer including a light-emitting material is sandwiched between a pair of electrodes. Carriers are injected by application of voltage to the device
Implementation Method 2
recombination energy of the carriers is used, whereby light emission can be obtained from the light-emitting material
Data Source
AI summary
A novel organic compound that enables a highly reliable light-emitting device is provided. An organic compound represented by Structural Formula (G1) below is provided. In the organic compound represented by General Formula (G1) below, at least one of R1 to R14 represents a group including aliphatic cyclic amine, and the others each independently represent any one of hydrogen, deuterium, an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, a substituted or unsubstituted monovalent aromatic hydrocarbon group having 6 to 30 carbon atoms, a substituted or unsubstituted monovalent heteroaromatic group having 1 to 30 carbon atoms, and a group including aliphatic cyclic amine.