Amine-Containing Compound for Light-Emitting Device Hole Transport
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Solution Overview
Problem
Current light-emitting devices face challenges in achieving high efficiency, low driving voltage, and long lifespan due to limitations in the materials used for the hole transport region and emission layer, particularly in terms of charge resistance and molecular packing density.
Innovation Solution
Incorporating an amine-containing compound represented by specific formulas into the light-emitting device, which includes a phenyl and/or naphthalene moiety in the interlayer or hole transport region to enhance charge resistance, reduce molecular interactions, and adjust the hole injection barrier, thereby improving exciton production efficiency and device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional materials are used for the hole transport region and emission layer, then the device structure is simple, but the charge resistance is high and efficiency is low
Solution Approach 1:
The patent introduces an amine-containing compound with specific molecular structure (Formula 1 or 2) that changes the physical and chemical parameters of the hole transport region. The compound features a nitrogen atom with lone pair electrons that can accept protons, creating a unique charge transport mechanism that reduces charge resistance and improves efficiency without fundamentally changing the device structure.
Solution Approach 2:
The patent uses a composite approach by combining the amine-containing compound with other organic materials in the hole transport region and emission layer. This composite material system leverages the unique properties of the amine compound (high charge mobility, appropriate HOMO level) alongside other materials to achieve both low charge resistance and high efficiency simultaneously.
2Illumination intensity
If materials with high molecular packing density are used, then the luminance is high, but the molecular interactions are strong leading to aggregation
Solution Approach 1:
The amine-containing compound exhibits local quality optimization where the nitrogen-containing functional group provides strong charge transport capability in specific regions, while the overall molecular structure maintains appropriate packing density. The compound's design allows different parts of the molecule to fulfill different functions: the amine group for charge transport and the aromatic cores for structural stability and controlled packing.
Solution Approach 2:
The patent modifies the molecular parameters of the hole transport material by introducing the amine-containing compound with specific structural parameters (Formula 1 or 2). This changes the packing behavior and intermolecular interactions, allowing the material to achieve optimal density that balances luminance generation with prevention of excessive aggregation.
3Power
If the hole injection barrier is low, then the driving voltage is low, but the charge transport efficiency is reduced
Solution Approach 1:
The amine-containing compound optimizes the energy level parameters of the hole transport region. The nitrogen atom's electronegativity and lone pair electrons create an optimal HOMO level that facilitates both easy hole injection (low barrier) and efficient charge transport. This parameter optimization allows the device to operate at low voltage without sacrificing transport efficiency.
Solution Approach 2:
The amine-containing compound acts as an intermediary between the electrode and the emission layer, facilitating smooth charge transfer. The nitrogen atom in the amine group serves as a mediator that accepts and transfers holes efficiently, enabling low voltage operation while maintaining high charge transport efficiency across the interface.
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 amine-containing compound with phenyl and/or naphthalene moieties results in a light-emitting device with enhanced efficiency, low driving voltage, high luminance, and extended lifespan by optimizing the hole injection barrier and molecular packing density.
Implementation Method 1
Holes provided from the first electrode move toward the emission layer through the hole transport region
Implementation Method 2
reduce molecular interactions, and adjust the hole injection barrier
Implementation Method 3
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transition (relax) from an excited state to a ground state to thereby generate light
Data Source
AI summary
A light-emitting device that includes an amine-containing compound. An electronic apparatus and an electronic equipment that includes the light-emitting device. Utilization of the amine-containing compound in the light-emitting device may enhance or improve the operating characteristics of the device, such as driving voltage, luminance, efficiency, and/or lifespan.