Aromatic Compound for Light-Emitting Element Driving Voltage
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving high luminous efficiency and require materials that can sustainably operate at low driving voltages for effective light-emitting elements.
Innovation Solution
A light-emitting element is developed with a structure including a first electrode, a second electrode, and at least one functional layer containing an aromatic compound represented by a specific formula, which incorporates nitrogen-containing heterocyclic groups and divalent hydrocarbon or heterocyclic groups, enhancing electron transport properties and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic light-emitting materials are used, then the device structure is simple, but the luminous efficiency is low and driving voltage is high
Solution Approach 1:
The patent changes the chemical structure parameters of the organic compound by introducing nitrogen-containing heterocyclic groups (pyridine, pyrimidine, quinazoline, or triazine groups) at specific positions (Ar1-Ar4) of the core structure. This structural parameter change optimizes electron transport properties, resulting in improved luminous efficiency and reduced driving voltage in the light-emitting element.
Solution Approach 2:
The patent employs composite material design by combining the nitrogen-containing heterocyclic groups with divalent hydrocarbon ring groups or divalent heterocyclic groups in a specific molecular architecture. This composite structure integrates the electron-transporting capability of nitrogen heterocycles with the structural stability of hydrocarbon or heterocyclic frameworks, achieving enhanced performance in both luminous efficiency and electrical characteristics.
2Reliability
If nitrogen-containing heterocyclic groups are introduced to enhance electron transport, then luminous efficiency improves, but molecular complexity increases
Solution Approach 1:
The patent applies local quality modification by introducing nitrogen-containing heterocyclic groups only at specific positions (Ar1-Ar4) of the molecular core rather than throughout the entire structure. This localized functionalization enhances electron transport properties at critical sites while maintaining relative simplicity in other regions of the molecule, thus improving reliability without excessive complexity increase.
Solution Approach 2:
The nitrogen-containing heterocyclic groups serve multiple functions: they enhance electron transport capability, contribute to molecular stability, and enable tunable optical properties. This multi-functionality allows a single structural modification to address multiple performance requirements simultaneously, improving reliability without proportionally increasing 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 light-emitting element exhibits improved luminous efficiency and reduced driving voltage, effectively addressing the limitations of existing technologies by utilizing the aromatic compound in the functional layers for enhanced performance.
Implementation Method 1
enhancing electron transport properties and efficiency
Implementation Method 2
a self-luminous display element that achieves display by causing a light-emitting material of a light-emitting layer to emit light through recombining, in the light-emitting layer, holes and electrons injected from a first electrode and a second electrode
Data Source
AI summary
A light-emitting that includes a first electrode, a second electrode on the first electrode, and at least one functional layer between the first electrode and the second electrode is provided. At least one functional layer may include an aromatic compound represented by Formula 1. The light-emitting element results in a reduced driving voltage and an improved luminous efficiency.