Triazine Polymer for OLEDs via Solution Coating
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Solution Overview
Problem
Existing organic light-emitting elements using polymer compounds face challenges in achieving low driving voltage, high luminous efficiency, and maximum attainable brightness.
Innovation Solution
A polymer compound is developed containing a constitutional unit derived from an electron transport polymerizable compound with a specific structure, combined with a light-emitting polymerizable compound having phosphorescent properties and a hole transport polymerizable compound, such as a carbazole or triarylamine derivative, to form a light-emitting layer between an anode and a cathode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a low-molecular compound is used to form the organic layer, then the layer can be formed by vacuum deposition, but vacuum equipment is necessary and the film thickness becomes ununiform
Solution Approach 1:
The invention changes the physical state and molecular weight parameters of the organic layer material from low-molecular to polymer form, enabling the material to be applied via solution coating methods instead of vacuum deposition, thereby eliminating the need for vacuum equipment and achieving uniform film thickness
Solution Approach 2:
The invention replaces the mechanical vacuum deposition system with a chemical solution-based coating process, where the polymer compound is dissolved in a solvent and applied to the substrate, eliminating complex vacuum equipment while achieving controlled film formation
2Ease of manufacture
If a polymer compound is used to form the organic layer, then the layer can be formed by coating method, but the driving voltage and luminous efficiency are insufficient
Solution Approach 1:
The invention uses a copolymer compound comprising two types of repeating units: one providing electron transport capability and the other providing hole transport capability. This composite structure at the molecular level enables balanced charge transport, reducing driving voltage while maintaining ease of manufacture through coating methods
Solution Approach 2:
The invention introduces specific functional groups (electron-transporting groups and hole-transporting groups) at local positions within the polymer chain structure. This local functional differentiation enables the material to simultaneously provide both electron and hole transport functions, improving electrical properties without sacrificing the coating process advantage
3Ease of manufacture
If a polymer compound is used to form the organic layer, then the layer can be formed by coating method, but the luminous efficiency and maximum attainable brightness are insufficient
Solution Approach 1:
The copolymer structure combines electron-transporting units and hole-transporting units in a single material system, creating efficient charge generation and transport pathways that enhance luminous efficiency and maximum attainable brightness while preserving the solution-processability advantage of polymer materials
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 achieves an organic light-emitting element with low driving voltage and high luminous efficiency, enabling high luminance without the need for additional organic layers.
Implementation Method 1
a polymer compound containing a constitutional unit derived from an electron transport polymerizable compound
Implementation Method 2
a hole transport polymerizable compound, such as a carbazole or triarylamine derivative
Implementation Method 3
a light-emitting polymerizable compound having phosphorescent properties
Data Source
Figure 1
AI summary
The polymer compound of the present invention is characterized by comprising a constitutional unit derived from a compound represented by the formula (1): wherein A1, A3 and A5 are each independently a monovalent aromatic group which may have a hetero atom as a ring-constituting atom, A2, A4 and A6 are each independently a divalent aromatic group which may have a hetero atom as a ring-constituting atom, at least one of A1 to A6 has a substituent having a polymerizable functional group, A1 to A6 may have a substituent other than a substituent having a polymerizable functional group, m is an integer of 1 to 2, n is an integer of 0 to 2, and p is an integer of 0 to 2.