Single-Layer Organic EL Device with Mixed Transport Compounds
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Solution Overview
Problem
Current organic electroluminescence devices face challenges with low luminous efficiency and durability, particularly in display applications, due to the complexity of low-molecular materials and the difficulties in purifying high-molecular materials, which affect the stability and performance of the devices.
Innovation Solution
A process involving a mixture of hole transporting compounds, electron transporting compounds, and emitting compounds forming a single layer, with specific arylamine structures and molecular weights, to enhance luminous efficiency and durability, allowing for easier production of organic electroluminescence devices with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If low-molecular materials are used for organic EL devices, then device manufacturing complexity increases due to lamination requirements, but material purification is easier
Solution Approach 1:
The patent combines hole transporting compound and electron transporting compound into a single mixed layer, eliminating the need for separate lamination steps. This merging of functions into one layer reduces production complexity while maintaining the benefits of using purified intermediate molecular weight materials.
Solution Approach 2:
The patent uses composite materials by mixing hole transporting and electron transporting compounds in a single layer with intermediate molecular weight (1500-6000), creating a composite functional layer that simplifies manufacturing while achieving good emission properties and device stability.
2Reliability
If high-molecular materials are used for organic EL devices, then purification becomes difficult, but device emission properties and life are reduced
Solution Approach 1:
The patent changes the molecular weight parameter to an intermediate range (1500-6000), which is higher than low-molecular materials (easier purification) but lower than high-molecular materials (better emission properties and device life). This parameter optimization resolves the contradiction between purification ease and device performance.
3Reliability
If organic EL devices are to achieve high luminous efficiency and durability, then material selection becomes more complex, but production simplicity is reduced
Solution Approach 1:
The patent creates a universal mixed layer that simultaneously provides hole transport, electron transport, and emission functions. This multi-functionality in a single layer achieves high luminous efficiency and durability while simplifying production by eliminating the need for multiple separate material layers.
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 solution results in organic electroluminescence devices with excellent luminous efficiency and durability, suitable for displays and illuminations, simplifying the production process and improving device stability and performance.
Implementation Method 1
One of the organic layers contains a hole transporting compound and an electron transporting compound
Implementation Method 2
organic electroluminescence devices having excellent luminous efficiency and durability
Data Source
Figure 1
AI summary
Organic electroluminescence devices of the invention have excellent luminous efficiency and durability. Uses of the devices are also disclosed. The organic electroluminescence device includes a pair of electrodes and one or more organic layers including an emitting layer between the pair of electrodes, wherein one of the organic layer(s) includes a hole transporting compound having 2 to 10 arylamine structures in the molecule, an electron transporting compound having a structure of Formula (a) below and an emitting compound.