Polycyclic Charge Generation Layer for Efficient Light Emission
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Solution Overview
Problem
Existing organic electroluminescence displays face challenges in achieving low driving voltage, high luminous efficiency, and long lifespan, necessitating the development of materials that can stabilize these characteristics.
Innovation Solution
Incorporation of a polycyclic compound in the charge generation layer of a light emitting element, specifically represented by Formula 1, which includes a direct linkage or substituted arylene or heteroarylene group, and a substituted or unsubstituted aryl group, to enhance charge generation and transport, thereby improving luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional materials are used in the charge generation layer, then the device structure remains simple, but luminous efficiency is insufficient
Solution Approach 1:
The patent employs composite materials by combining the polycyclic compound (Formula 1) with specific dopants (n-type: 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane or 7,7,8,8-tetracyano-p-quinodimethane; p-type: 4-nitro-1,2,3,6-tetrahydropyridine or 4-nitro-1,2,3,6-tetrahydropyridine hydrochloride) in the charge generation layer. This composite approach enhances charge generation and transport properties, thereby improving luminous efficiency while maintaining a relatively simple device structure.
Solution Approach 2:
The patent utilizes parameter changes by carefully controlling the doping concentration ratios (n-type dopant: host compound = 1:100 to 1:10, p-type dopant: host compound = 1:100 to 1:10) and molecular structure parameters of the polycyclic compound (Formula 1) to optimize charge generation efficiency and luminous performance without significantly complicating the device architecture.
2Power
If existing materials are used, then the manufacturing process remains simple, but driving voltage is high
Solution Approach 1:
The patent achieves lower driving voltage by optimizing molecular structure parameters of the polycyclic compound (Formula 1) with specific L1 and Ar1 groups, and by controlling dopant concentration parameters. These parameter optimizations improve charge transport efficiency, reducing the voltage required for device operation while maintaining simple manufacturing processes.
Solution Approach 2:
The composite material system comprising the polycyclic compound (Formula 1) combined with specifically selected n-type and p-type dopants creates enhanced charge generation and transport properties, enabling reduced driving voltage without complicating the manufacturing process.
3Duration of action of stationary object
If conventional compounds are used, then the device structure remains simple, but lifespan is short
Solution Approach 1:
The patent employs a composite material system with the polycyclic compound (Formula 1) combined with specific n-type and p-type dopants that provide superior chemical stability and operational durability. This composite approach extends device lifespan through improved material stability while maintaining relatively simple device structure.
Solution Approach 2:
The patent optimizes the molecular structure parameters of the polycyclic compound (Formula 1) with stable aromatic groups (L1 and Ar1) and controls dopant concentration ratios to enhance chemical stability and operational lifetime, achieving extended lifespan without significantly increasing device complexity.
4Productivity
If existing materials are used, then the charge generation layer remains simple, but luminous efficiency is low
Solution Approach 1:
The patent implements a composite material system in the charge generation layer, combining the polycyclic compound (Formula 1) with specifically selected n-type and p-type dopants. This composite structure enhances charge generation and transport efficiency, significantly improving luminous efficiency while maintaining reasonable structural simplicity.
Solution Approach 2:
The patent applies local quality by optimizing the specific molecular structure of the polycyclic compound (Formula 1) with tailored L1 and Ar1 groups at the molecular level, and by controlling local dopant distribution with specific concentration ratios, thereby enhancing charge generation efficiency in the charge generation layer without overall device complexity.
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 the polycyclic compound in the charge generation layer results in a light emitting element with enhanced luminous efficiency and stability, addressing the limitations of existing technologies.
Implementation Method 1
holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, whereby a luminescent material including an organic compound in the emission layer emits light
Data Source
AI summary
Provided is a polycyclic compound and a light emitting element including the polycyclic compound. The light emitting element includes a first electrode, a second electrode facing the first electrode, light emitting structures disposed between the first electrode and the second electrode, and a charge generation layer disposed between adjacent ones of the light emitting structures and including a polycyclic compound represented by Formula 1, thereby exhibiting high luminous efficiency.