Aromatic Amine Covering Layer for OLED Light Extraction
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Solution Overview
Problem
Current organic light-emitting elements, particularly top-emitting types, face challenges in achieving high light extraction efficiency and color purity, especially for blue light-emitting elements, due to limitations in materials used for the organic covering layer.
Innovation Solution
The use of an aromatic amine compound with a thiophene-based, furan-based, or pyrrole-based structure as the organic covering layer material, which enhances thin-film stability and refractive index, thereby improving light extraction efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic covering layer materials are used, then the device structure is simple, but light extraction efficiency and color purity are insufficient
Solution Approach 1:
The patent changes the optical parameters of the covering layer material by selecting aromatic amine compounds with specific refractive index ranges (1.7-2.5 at 550nm) and energy gap ranges (2.5-3.2eV for blue light elements), thereby optimizing light extraction efficiency and color purity without complicating the device structure
Solution Approach 2:
The patent uses composite material design by combining aromatic amine compounds with specific heterocyclic structures (thiophene, furan, or pyrrole) and aromatic hydrocarbon groups, creating materials that simultaneously achieve high refractive index, appropriate energy gap, and good film stability
2Device complexity
If conventional organic covering layer materials are used, then the material structure is simple, but color purity is insufficient
Solution Approach 1:
The patent optimizes the energy gap parameter of the covering layer material to be in the range of 2.5-3.2eV for blue light-emitting elements, which prevents energy transfer from the light-emitting layer to the covering layer, thereby improving color purity while maintaining relatively simple material structure
Solution Approach 2:
The patent introduces local heterocyclic structures (thiophene, furan, or pyrrole) within the aromatic amine compound to specifically enhance optical properties in the blue light region, improving color purity without requiring complete structural complexity throughout the entire molecule
3Illumination intensity
If the refractive index of the organic covering layer is increased, then light extraction efficiency is improved, but thin-film stability may be compromised
Solution Approach 1:
The patent designs composite aromatic amine compounds that integrate high refractive index heterocyclic cores (thiophene, furan, or pyrrole) with stabilizing aromatic hydrocarbon substituents, achieving both high refractive index (1.7-2.5) and excellent thin-film stability through the synergistic structure
Solution Approach 2:
The patent localizes the high refractive index property to the heterocyclic core structure while using aromatic hydrocarbon groups to provide structural stability and film-forming properties, thereby achieving both high light extraction efficiency and thin-film stability through differentiated functional regions
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 aromatic amine compound significantly improves light extraction efficiency and color purity of organic light-emitting elements by providing superior thin-film stability and a higher refractive index, effectively addressing the limitations of existing materials.
Implementation Method 1
an aromatic amine compound... which enhances thin-film stability and refractive index, thereby improving light extraction efficiency
Implementation Method 2
the light is generated when holes and electrons recombine in light-emitting layer and return to the ground state from the excited state
Data Source
AI summary
Provided are an aromatic amine compound as represented by formula (1),used for improving light extraction efficiency and color purity of an organic light-emitting element, an organic light-emitting element material containing the aromatic amine compound, an organic light-emitting element covering layer material containing the aromatic amine compound, and an organic light-emitting element containing the aromatic amine compound. The organic light-emitting element achieves high light-emitting efficiency and color reproducibility. The organic light-emitting element can be used as organic EL display, backlight source for liquid crystal display, illumination, light source for measurement devices, indication board or identification lamp etc. The organic light-emitting element significantly improves light extraction efficiency and has superior color purity.