Nitrogen-Containing Compound for Low Voltage OLED Emission
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high luminous efficiency, and long service life for light emitting elements.
Innovation Solution
A nitrogen-containing compound is used in the emission layer of a light emitting element, specifically designed with a nitrogen-containing core portion and substituents that reduce driving voltage and enhance light efficiency and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in the emission layer, then the light emitting element can achieve basic light emission, but the driving voltage remains high and service life is limited
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the emission layer material to include a nitrogen-containing core portion with specific substituents (carbazole groups, dibenzofuran groups, dibenzothiophene groups). This structural parameter change optimizes the material's electronic properties, resulting in reduced driving voltage and extended service life simultaneously.
Solution Approach 2:
The invention uses composite materials by combining the nitrogen-containing core portion with multiple types of substituents (carbazole, dibenzofuran, dibenzothiophene) to create a compound with synergistic properties. This composite structure enables the material to achieve both low driving voltage and high reliability that cannot be obtained with single-component materials.
2Productivity
If conventional emission layer materials are used, then the device structure remains simple, but luminous efficiency is insufficient
Solution Approach 1:
The patent applies local quality by introducing specific functional groups (carbazole, dibenzofuran, dibenzothiophene) at particular positions around the nitrogen-containing core. Each substituent provides localized electronic properties that enhance overall luminous efficiency while maintaining a relatively simple core structure, thus improving performance without excessive 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 nitrogen-containing compound reduces driving voltage and increases luminous efficiency and service life of the light emitting element, addressing the limitations of existing technologies.
Implementation Method 1
organic electroluminescence display devices and the like are display devices including so-called self-luminescent light emitting elements in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and thus a luminescent material in the emission layer emits light
Data Source
AI summary
Provided is a light emitting element including a first electrode, a second electrode facing the first electrode, and an emission layer between the first electrode and the second electrode. The light emitting element according to an embodiment includes a nitrogen-containing compound represented by Formula 1 in the emission layer, and may thus exhibit improved luminous efficiency, long lifespan, and low driving voltage.