OLED Host Material Composition for Low-Voltage, Long-Life Emission
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Solution Overview
Problem
There is a need for organic electroluminescent devices with low driving voltage, high luminous efficiency, and long lifespan, which current light-emitting materials fail to provide effectively.
Innovation Solution
The use of a plurality of host materials, comprising a first host material represented by formula 1 and a second host material represented by formula 2, in the light-emitting layer of an organic electroluminescent device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional light-emitting materials are used, then the device structure is simple, but the driving voltage is high and luminous efficiency is low
Solution Approach 1:
The patent applies composite materials by combining two different host materials (first host material and second host material) in the light-emitting layer. This composite approach enables the device to achieve low driving voltage and high luminous efficiency by leveraging the complementary properties of different host materials, resolving the contradiction between performance improvement and material system complexity.
2Duration of action of stationary object
If conventional light-emitting materials are used, then the manufacturing process is simple, but the device lifespan is short
Solution Approach 1:
The patent uses a composite light-emitting material system comprising first host material, second host material, and dopant material. This composite structure improves device lifespan by combining materials with different functional characteristics, where the first host material provides stable charge transport and the second host material enhances exciton management, thereby extending device operational lifetime despite increased material system complexity.
3Stress or pressure
If conventional light-emitting materials are used, then the device structure is simple, but the driving voltage is high
Solution Approach 1:
The patent applies local quality by assigning different functional roles to different host materials within the light-emitting layer. The first host material is optimized for specific properties (e.g., charge transport) while the second host material is optimized for other properties (e.g., exciton confinement), allowing the device to achieve low driving voltage through localized functional optimization without requiring complete redesign of the entire material system.
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
This configuration enables the preparation of organic electroluminescent devices with low driving voltage and high luminous efficiency, while also extending the lifespan of the device.
Implementation Method 1
An OLED changes electric energy into light by applying electricity to an organic electroluminescent material
Data Source
AI summary
The present disclosure relates to a plurality of host materials comprising a first host material comprising a compound represented by formula 1 and a second host material comprising a compound represented by formula 2 and an organic electroluminescent device comprising the same. By comprising the host materials according to the present disclosure, an organic electroluminescent device having low driving voltage and/or high luminous efficiency and/or long lifespan can be provided.