Host Material Combination for OLED Driving Voltage
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Solution Overview
Problem
Current organic electroluminescent devices face challenges in achieving low driving voltage, high luminous efficiency, and long lifespan, particularly for medium and large-sized OLED panels, with existing host materials not adequately addressing these requirements.
Innovation Solution
A combination of at least one first host compound represented by a specific formula and at least one second host compound, used in various layers of the OLED device, including the light-emitting layer, to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional single host materials are used in OLED, then device structure is simple, but driving voltage is high and luminous efficiency is low
Solution Approach 1:
The patent employs composite host materials by combining multiple host compounds (e.g., compounds of formula 1 and formula 2) in specific weight ratios (95:5 to 5:95) to create a synergistic system that achieves low driving voltage and high luminous efficiency, resolving the contradiction between performance improvement and material complexity
2Productivity
If conventional host materials are used, then material selection is simple, but luminous efficiency and lifespan are insufficient
Solution Approach 1:
The patent optimizes specific molecular structure parameters of host materials (formula 1 with L, Ar, Ar2, Ar3 groups and formula 2 with Y1, R1-R3, L4, Ar4 groups) and their combination ratios to achieve enhanced luminous efficiency and lifespan, transforming the host material system from simple to optimized composite
3Duration of action of stationary object
If single host material is used, then device manufacturing is simple, but lifespan characteristics are short
Solution Approach 1:
The patent uses composite host materials comprising compounds of formula 1 and formula 2 in optimized weight ratios to enhance device lifespan through synergistic effects, where the combination provides improved stability and durability compared to single host materials
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 use of this host material combination results in an organic electroluminescent device with low driving voltage, high luminous efficiency, and extended lifespan, outperforming devices using single host materials or conventional host materials.
Implementation Method 1
An organic electroluminescent device (OLED) was first developed by Eastman Kodak in 1987, by using small aromatic diamine molecules and aluminum complexes as materials for forming a light-emitting layer
Data Source
AI summary
The present disclosure relates to a plurality of host materials comprising at least one first host compound and at least one second host compound, and an organic electroluminescent device comprising the same. By comprising a specific combination of compounds according to the present disclosure as host materials, an organic electroluminescent device having a low driving voltage, high luminous efficiency, and long lifespan characteristics can be provided.