OLED Emitting Layer Composition for Lower Voltage and Longer Life
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Solution Overview
Problem
There is a continuing demand for organic light emitting devices with improved driving voltage, efficiency, and lifetime.
Innovation Solution
The organic light emitting device includes a light emitting layer composed of specific compounds represented by Chemical Formulas 1 and 2, which enhance the device's performance by optimizing the anode and cathode structures, incorporating layers such as hole injection, transport, blocking, and electron transport layers, and using materials like metal porphyrine and Al complexes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional organic material layers are used in the light emitting device, then the device structure is simple, but the driving voltage is high and efficiency is low
Solution Approach 1:
The organic material layer is segmented into multiple functional sub-layers: hole injection layer, hole transport layer, light emitting layer, electron transport layer, and electron injection layer. Each sub-layer is optimized for its specific function, enabling better charge carrier management and reduced driving voltage while maintaining structural organization.
Solution Approach 2:
The patent employs composite material structures where different organic materials are combined in specific layers. Each layer uses materials optimized for its function (e.g., hole transport materials in the hole transport layer, electron transport materials in the electron transport layer), creating a composite structure that achieves low driving voltage and high efficiency.
2Device complexity
If conventional organic material layers are used in the light emitting device, then the device structure is simple, but the efficiency is low
Solution Approach 1:
The organic material layer is divided into specialized sub-layers (hole injection, hole transport, light emitting, electron transport, electron injection), where each sub-layer contains materials optimized for its specific function. This segmentation enables efficient charge carrier generation, transport, and recombination, significantly improving device efficiency.
Solution Approach 2:
Each sub-layer is designed with local quality optimization: hole transport layer uses materials with high hole mobility, electron transport layer uses materials with high electron mobility, and the light emitting layer uses materials with high luminescence efficiency. This localized optimization of material properties maximizes overall device efficiency.
3Ease of manufacture
If conventional organic material layers are used in the light emitting device, then the manufacturing process is simple, but the lifetime is short
Solution Approach 1:
The organic material layer is segmented into multiple protective and functional sub-layers that can be manufactured using standard vacuum deposition techniques. Each layer provides specific protection (e.g., electron injection layer protects against electron damage, hole blocking layer prevents hole accumulation), extending device lifetime while maintaining ease of manufacture through established processes.
Solution Approach 2:
The patent incorporates protective layers (electron injection layer, hole blocking layer) that are deposited beforehand to prevent degradation from the start. These layers cushion against harmful effects (electron bombardment, hole accumulation) before they can damage the light emitting layer, thereby extending device lifetime.
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 device achieves improved driving voltage, efficiency, and extended lifetime through the use of these specialized compounds and layer configurations.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Data Source
AI summary
An organic light emitting device having improved driving voltage, efficiency and lifetime, the organic light emitting device having an anode, a cathode, and a light emitting layer disposed between the anode and the cathode, wherein the light emitting layer includes a compound of the following Chemical Formula 1, and a compound of the following Chemical Formula 2: