Branch-Type Polymer for Solution-Processed OLEDs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing deposition process for manufacturing organic light emitting devices results in significant material loss and makes it difficult to produce large area devices, prompting the need for materials suitable for a solution process with improved solubility and viscosity.
Innovation Solution
A polymer incorporating a unit represented by Chemical Formula 1 is developed, which allows for the formation of a branch-type polymer structure, enhancing solubility and viscosity for organic solvents, thereby facilitating a solution process. This polymer is used in the organic material layer of an organic light emitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a deposition process is used to manufacture organic light emitting devices, then the device can be manufactured with conventional materials, but material loss is significant and large area device manufacturing is difficult
Solution Approach 1:
The patent replaces the mechanical deposition process with a solution-based coating process. The polymer material is dissolved in an organic solvent to form a coating composition that can be applied to substrates using conventional coating techniques, eliminating the material loss and manufacturing limitations associated with deposition processes.
Solution Approach 2:
The patent changes the physical state of the material from solid (requiring deposition) to dissolved state (enabling coating). By designing the polymer with appropriate solubility parameters and molecular weight, the material can be processed as a solution, fundamentally changing the manufacturing approach from deposition to coating.
2Device complexity
If conventional organic materials are used, then the device structure is simple, but solubility and viscosity for solution process are insufficient
Solution Approach 1:
The patent creates a composite polymer structure combining conjugated backbone units (for charge transport) with solubilizing side chains (for solution processability). This composite approach integrates the functional requirements of device operation with the processing requirements of solution fabrication.
Solution Approach 2:
The patent segments the polymer structure into distinct functional units: a conjugated backbone for charge transport and solubilizing side chains for solution processing. This segmentation allows each part to perform its specific function independently while working together as an integrated material system.
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 polymer improves the hole transfer properties of the organic material layer, resulting in enhanced efficiency and lifetime of the organic light emitting device.
Implementation Method 1
the polymer improves the hole transfer properties of the organic material layer, resulting in enhanced efficiency
Data Source
Figure 1
AI summary
The present specification relates to a polymer including a unit represented by Chemical Formula 1, a coating composition including the same, and an organic light emitting device formed using the same.