Crosslinked Charge Transport Materials for Flexible Light-Emitting Elements
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Solution Overview
Problem
Existing flexible display devices using organic light-emitting diodes face challenges in achieving improved performance and flexibility, particularly in the formation of functional layers through conventional processing methods.
Innovation Solution
A light-emitting element is developed with a charge transport material derived from a mixture of an azide compound and a polymer compound, which includes an aromatic ring group, allowing for improved flexibility and performance through wet processing and crosslinking, and can be used in functional layers such as hole transport regions, electron transport regions, or light-emitting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional processing methods are used to form functional layers in organic light-emitting diodes, then the manufacturing process is simple, but the flexibility and performance of the display device are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the charge transport material. Specifically, it uses a polymer compound with aromatic ring groups (such as polyvinylcarbazole) combined with azide compounds in specific mole ratios (1:1.85 to 1:3.0), which changes the material properties to enable both wet processing compatibility and improved device performance and flexibility
Solution Approach 2:
The patent employs composite materials by combining the polymer compound including aromatic ring groups with azide compounds to form a composite charge transport material. This composite structure integrates the processability benefits of polymers with the functional properties of azide compounds, achieving both ease of manufacture through wet processing and improved reliability in terms of flexibility and performance
2Reliability
If a charge transport material derived from azide compound and polymer compound mixture is used, then flexibility and performance are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent manages material composition complexity by specifying precise parameter ranges: the mole ratio of azide compound to polymer compound is controlled at 1:1.85 to 1:3.0, and the polymer compound has defined molecular weight ranges (e.g., polyvinylcarbazole with n2 = 100 to 300). These controlled parameters simplify the manufacturing process despite the composite nature of the material
3Strength
If crosslinking is used to form the charge transport material, then durability and functionality are enhanced, but the processing difficulty increases
Solution Approach 1:
The patent applies preliminary action by pre-mixing the azide compound and polymer compound in the desired ratio before the crosslinking step. This preliminary preparation ensures uniform distribution of components, which simplifies the subsequent crosslinking process and reduces processing difficulty while maintaining durability enhancement
Solution Approach 2:
The patent utilizes phase transitions in the crosslinking process, where the azide compound undergoes photopolymerization or thermal crosslinking to transform from a processable state to a crosslinked network structure. This phase transition enables the material to achieve enhanced durability while the crosslinking can be controlled to maintain processability
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 use of this charge transport material enhances the flexibility and performance of display devices by enabling the formation of functional layers through wet processing, allowing for improved durability and functionality in various display states.
Implementation Method 1
the charge transport material may be formed by crosslinking the polymer compound with the azide compound
Implementation Method 2
An organic light-emitting diode, which is a self-luminous element, emits light from a recombination of holes and electrons injected from a first electrode and a second electrode in a light-emitting layer
Data Source
AI summary
A light-emitting element includes a first electrode, a second electrode disposed on the first electrode, and at least one functional layer disposed between the first electrode and the second electrode. The at least one functional layer includes a charge transport material derived from an azide compound represented by Formula 1 and a polymer compound including an aromatic ring group. The light-emitting element may be formed by a wet process and may exhibit improved flexibility.