Nitrogen-Containing Host Material for OLED Driving Voltage Reduction
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in reducing driving voltage and improving light efficiency in light emitting elements.
Innovation Solution
A light emitting element is developed with a nitrogen-containing compound, specifically a compound represented by Formula 1, which is used in the emission layer, incorporating carbazole groups bonded to a hexagonal monocyclic ring containing nitrogen, acting as a host material to enhance light emission efficiency and reduce driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional materials are used in the emission layer, then the light emitting element can operate, but the driving voltage is high and light efficiency is low
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the host material through specific molecular design (Formula 1 with nitrogen-containing hexagonal monocyclic ring and carbazole groups). This structural parameter change results in optimized energy levels and improved charge transport properties, directly addressing the contradiction by achieving lower driving voltage and higher light efficiency simultaneously through material composition optimization
Solution Approach 2:
The patent employs composite materials by combining the nitrogen-containing compound (host) with dopant materials in specific ratios. This composite approach creates synergistic effects where the host material provides structural framework and energy level optimization, while the dopant enhances emission characteristics, together resolving the contradiction between driving voltage and light efficiency
2Reliability
If the emission layer uses conventional compounds, then device operation is achieved, but dopant deterioration occurs and triplet excitation energy levels are insufficient
Solution Approach 1:
The patent applies local quality by designing the host material with specific functional groups (nitrogen-containing hexagonal monocyclic ring and carbazole groups) that create localized regions with appropriate energy levels and chemical properties. This localized optimization ensures the host material can effectively protect the dopant while maintaining high triplet excitation energy levels, preventing dopant deterioration without sacrificing energy efficiency
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 nitrogen-containing compound in the light emitting element decreases the driving voltage and improves light efficiency, preventing dopant deterioration and maintaining high triplet excitation energy levels, thus enhancing the overall performance of the display device.
Implementation Method 1
The organic electroluminescence display device includes so-called a self-luminescent light emitting element in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and thus a luminescent material of the emission layer emits light
Data Source
AI summary
A light emitting element including a first electrode, a second electrode on the first electrode, and an emission layer between the first electrode and the second electrode that includes a first compound represented by Formula 1. The light emitting element including the first compound of an embodiment may have a decrease in the driving voltage and exhibit excellent or suitable efficiency.