Crosslinkable Polymer Compound for Light-Emitting Device Stability
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Solution Overview
Problem
The existing polymer compounds used in light-emitting devices have insufficient hardening ability, which affects their stability and performance.
Innovation Solution
A polymer compound comprising specific repeating units, including a fluorene-diyl group and a divalent heterocyclic or aromatic amine group, with a defined molar ratio, is used to enhance the hardening and charge transport properties, forming a crosslinkable polymer for improved stability and performance in light-emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polymer compound with benzocyclobutene residue as crosslinking group is used, then the organic layer can be hardened through intra-molecular/inter-molecular crosslinking, but the hardening ability is insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer compound by introducing specific repeating units with crosslinkable groups (formula I and II) and controlling their molar ratios. This structural parameter change enables sufficient hardening ability while maintaining stability, resolving the contradiction between hardening capability and reliability.
Solution Approach 2:
The patent creates a composite polymer structure combining different repeating units (formula I and formula II) with complementary functions. Formula I provides crosslinking capability while formula II enhances stability, and their combination in specific molar ratios achieves both sufficient hardening and high reliability simultaneously.
2Reliability
If a polymer compound is used to form a light-emitting device, then charge transport is required for device functionality, but existing compounds lack sufficient hardening ability which compromises device performance
Solution Approach 1:
The polymer compound is designed to perform multiple functions simultaneously: charge transport through the conjugated backbone structure and hardening through the crosslinkable groups in repeating units. This multi-functionality resolves the contradiction by enabling the material to satisfy both device performance requirements and hardening capability needs.
Solution Approach 2:
By adjusting the molar ratios of repeating units (formula I and formula II) and selecting appropriate aromatic groups (Ar1, Ar2), the patent optimizes the balance between charge transport properties and hardening ability, achieving sufficient device performance with improved hardening characteristics.
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 compound exhibits excellent hardening and charge transport properties, leading to enhanced stability and performance in light-emitting devices, including improved durability and efficiency.
Implementation Method 1
a polymer compound, which has a benzocyclobutene residue alone as a crosslinking group, capable of intra-molecularly/inter-molecularly crosslinking to harden the organic layer
Data Source
AI summary
A polymer compound including: the repeating unit shown in the following formula (I) (wherein: Ar1 represents an arylene group, a divalent heterocyclic group, or a divalent aromatic amine; J1 and J2 each represent a direct bond, an alkylene group, or a phenylene group, and X1 represents an oxygen atom or a sulfur atom; i is an integer from 0 to 3; j is 0 or 1; m is 1 or 2; and R1 represents a hydrogen atom, an alkyl group, an alkoxy group, or the like) and the repeating unit shown in the following formula (II) (wherein: Ar2 represents a fluorene-diyl group; J3 and J4 each represent a direct bond, an alkylene group, or a phenylene group; X2 represents an oxygen atom or a sulfur atom; k is an integer from 0 to 3; 1 is o or 1; and n is 1 or 2).