Organic EL Device Host-Guest Layer for Low Voltage Efficiency
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Solution Overview
Problem
Conventional organic electroluminescence devices have not achieved sufficient performance enhancement, necessitating improved materials and configurations for enhanced efficiency and reduced driving voltage.
Innovation Solution
An organic electroluminescence device comprising a cathode, an anode, and one or two organic layers with specific compounds, where at least one layer includes a first component represented by formula (1) and a second component represented by formula (2), allowing for the formation of substituted or unsubstituted single rings or fused rings, optimizing electron transport and recombination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic EL device structures are used, then device fabrication is straightforward, but device performance (efficiency and driving voltage) is insufficient
Solution Approach 1:
The patent uses composite materials by combining a host compound (formula 1) and a guest compound (formula 2) in the emitting layer. The host compound provides structural framework while the guest compound contributes to electron transport and emission properties, achieving high efficiency and low driving voltage through synergistic effects of the composite system.
2Productivity
If simple organic layers are used, then manufacturing is easier, but electron transport and recombination efficiency is insufficient
Solution Approach 1:
The patent applies local quality by designing specific molecular structures with particular functional groups at different positions. The host compound (formula 1) has specific substituent patterns while the guest compound (formula 2) has complementary structure features, creating localized functional zones that optimize electron transport and recombination in specific regions of the emitting layer.
Solution Approach 2:
The patent changes molecular parameters by adjusting substituent groups R1-R6 in formula (1) and R1'-R6' in formula (2). By modifying these structural parameters, the patent optimizes HOMO/LUMO energy levels, molecular packing, and charge transport properties to achieve high electron mobility and efficient recombination.
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 configuration results in an organic EL device with higher performance, achieving low driving voltage and high efficiency by optimizing electron transport and recombination processes.
Implementation Method 1
holes and electrons are injected into an emitting layer from an anode and a cathode, respectively
Implementation Method 2
injected holes and electrons are recombined in the emitting layer
Implementation Method 3
injected holes and electrons are recombined in the emitting layer, and excitons are formed therein
Implementation Method 4
When voltage is applied to an organic electroluminescence device, holes and electrons are injected into an emitting layer
Data Source
AI summary
An organic electroluminescence device including a cathode, an anode, and one or two or more organic layers arranged between the cathode and the anode, wherein at least one layer of the one or two or more organic layers includes a first component and a second component, the first component is a compound represented by the following formula (1), and the second component is a compound represented by the following formula (2).