OLED Light-Emitting Layer Composition for Higher Luminous Efficiency
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Solution Overview
Problem
There is a need for highly efficient organic electroluminescent devices with improved luminous efficiency, which has not been fully achieved with existing materials and structures.
Innovation Solution
The use of a light emitting layer incorporating a polycyclic aromatic compound, optionally combined with a capping layer, to enhance the efficiency of organic electroluminescent devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic layer materials and structures are used, then device structure is simple, but luminous efficiency is insufficient
Solution Approach 1:
The organic light-emitting device is divided into multiple functional layers including hole injecting layer, hole transport layer, light emitting layer, electron transport layer, and electron injecting layer. Each layer uses specific materials optimized for its function, allowing independent optimization of each layer to improve overall luminous efficiency while maintaining clear structural organization
Solution Approach 2:
The patent employs composite material systems where each organic layer contains specific combinations of materials with tailored properties. For example, the light emitting layer uses host-guest doping systems, and different layers use materials with specific HOMO/LUMO energy levels to achieve optimal charge transport and recombination, significantly improving luminous efficiency
2Illumination intensity
If existing light emitting materials are used, then material selection is simple, but color purity and luminous efficiency cannot be optimized
Solution Approach 1:
Different organic layers are assigned materials with specific local properties optimized for their function: hole transporting materials with appropriate HOMO levels in the hole transport layer, electron transporting materials with appropriate LUMO levels in the electron transport layer, and host-guest systems with specific emission characteristics in the light emitting layer. This localized optimization achieves high color purity and luminous efficiency
Solution Approach 2:
The patent optimizes key parameters including HOMO and LUMO energy levels of materials, layer thicknesses, and doping concentrations to achieve optimal performance. By carefully selecting materials with specific energy level parameters and optimizing structural parameters, the device achieves enhanced color purity and luminous 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 described configuration significantly improves the luminous efficiency of organic electroluminescent devices, achieving high performance in terms of light emission and device efficiency.
Implementation Method 1
electrons injected from an electron injecting electrode (cathode) recombine with holes injected from a hole injecting electrode (anode) in a light emitting layer to form excitons, which emit light while releasing energy
Data Source
AI summary
An organic light-emitting element according to the present invention employs a polycyclic aromatic derivative compound in a light-emitting layer inside the element, and further comprises a capping layer. Thus, the organic light-emitting element can be made highly efficient and can be useful for a device selected from among a flat panel display device, a flexible display device, a monochrome or white flat panel lighting device, and a monochrome or white flexible lighting device.