OLED Emission Layer Compounds for Lower Voltage and Higher Luminance
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in enhancing their performance in terms of luminance, driving voltage, and response speed, while maintaining wide viewing angles and high contrast ratios.
Innovation Solution
Incorporating specific compounds represented by Formulas 1 and 2, including carbocyclic and heterocyclic groups, into the interlayer of the light-emitting device to optimize the recombination of holes and electrons, thereby improving the efficiency and performance of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic light-emitting devices are used, then they can produce full-color images with wide viewing angles, but they suffer from high driving voltages and short lifespan due to inadequate electron transport capabilities
Solution Approach 1:
The patent changes the chemical composition parameters of the electron transport region by introducing specific compounds (Formula 2) with particular molecular structures containing electron-rich groups and appropriate LUMO energy levels. This parameter change optimizes electron transport capability, reduces driving voltage, and extends device lifespan simultaneously
Solution Approach 2:
The patent employs composite material strategy by combining the first compound (Formula 1) in the emission layer with the second compound (Formula 2) in the electron transport region. This composite approach creates synergistic effects where the emission layer generates excitons efficiently and the electron transport region facilitates electron injection and transport, resolving the contradiction between reliability and energy consumption
2Productivity
If conventional emission layers are used, then they can generate light through carrier recombination, but they achieve insufficient luminescence efficiency due to poor electron transport
Solution Approach 1:
The second compound (Formula 2) acts as an intermediary material in the electron transport region, facilitating electron transport from the electrode to the emission layer. This intermediary layer with optimized LUMO energy levels and electron mobility enables efficient electron injection and transport, which directly improves luminescence efficiency by ensuring sufficient electrons reach the emission layer for recombination
Solution Approach 2:
The patent optimizes the LUMO energy level parameter of the electron transport material to be lower than that of the emission layer, creating an energy gradient that drives electron transport. This parameter optimization ensures efficient electron injection and transport, directly improving luminescence 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 proposed compounds enhance the luminance, reduce driving voltage, and increase response speed, while maintaining wide viewing angles and high contrast ratios, thus improving the overall performance of the organic light-emitting devices.
Implementation Method 1
Holes provided from the first electrode may move toward the emission layer through the hole transport region, and electrons provided from the second electrode may move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transit from an excited state to a ground state to thereby generate light.
Data Source
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Figure 3
AI summary
Provided are a light-emitting device and an electronic apparatus including the same. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer, at least one first compound represented by Formula 1, and at least one second compound represented by Formula 2.