OLED Hole Transport Polymer for Low-Temperature Solution Processing
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Solution Overview
Problem
Current organic light emitting devices face limitations in using solution processes for all layers, leading to degraded device performance due to interlayer mixing and solubility issues in solvents, which affects efficiency and stability.
Innovation Solution
A novel polymer with specific repeating units is developed, allowing for solvent orthogonality and improved solubility, enabling the formation of a hole transport layer via a solution process that inhibits interlayer mixing and reduces curing temperature, thus enhancing the efficiency and lifetime of organic light emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a solution process is used for coating organic light emitting device layers, then process costs are reduced, but interlayer mixing and solubility issues occur leading to degraded device performance
Solution Approach 1:
The patent introduces a polymer with specific repeating units containing solubility control groups and crosslinkable groups. By changing the chemical structure parameters of the polymer (adding specific functional groups at controlled positions), the material achieves both solution processability and resistance to interlayer mixing, thus resolving the contradiction between ease of manufacture and device performance reliability
Solution Approach 2:
The patent creates a composite polymer structure combining multiple functional units: repeating units with solubility control groups (for solution processing), repeating units with crosslinkable groups (for forming protective networks), and repeating units with hole transport groups (for device function). This composite material design enables simultaneous achievement of solution processability, interlayer mixing prevention, and high device performance
2Reliability
If conventional deposition processes are used for organic light emitting device layers, then device performance is maintained, but process costs increase
Solution Approach 1:
The patent replaces the conventional vacuum deposition mechanical process with a chemical solution process. The polymer's unique structure (with solubility control groups and crosslinkable groups) enables solution coating methods to achieve deposition quality previously only attainable through expensive vacuum deposition, thus substituting mechanical deposition with chemical deposition while reducing costs
3Stability of the object's composition
If high curing temperatures are used for the hole transport layer, then complete curing is achieved, but device lifetime and efficiency are reduced
Solution Approach 1:
The patent introduces repeating units with crosslinkable groups that enable low-temperature curing through chemical crosslinking reactions. By changing the curing mechanism from thermal processing to chemical crosslinking, the polymer achieves complete curing at lower temperatures, thereby extending device lifetime while maintaining curing completeness
Solution Approach 2:
The patent utilizes chemical crosslinking phase transition to transform the polymer network structure. The crosslinkable groups undergo chemical reactions forming a crosslinked network that provides both complete curing and interlayer mixing prevention at lower temperatures, avoiding the thermal degradation associated with high-temperature curing processes
Data Source
AI summary
The present invention provides a novel polymer and an organic light emitting device including the same.