Organic Light Emitting Device Hole Control Layer Efficiency
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Solution Overview
Problem
There is a need for improved materials in organic light emitting devices to enhance efficiency, reduce driving voltage, and extend lifetime characteristics.
Innovation Solution
The organic light emitting device includes a specific structure with a hole transport layer, a hole control layer containing a compound of Chemical Formula 1, a light emitting layer comprising compounds of Chemical Formulas 2-1 or 2-2, and an electron transport layer, which together improve efficiency and reduce driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic materials are used in the light emitting layer, then the device can operate, but the efficiency is insufficient and lifetime is short
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of organic compounds in the light emitting layer through chemical formula design (Formulas 2-1, 2-2, and 3), optimizing parameters such as molecular weight, functional groups, and structural configurations to achieve both high efficiency and extended device lifetime simultaneously
Solution Approach 2:
The patent employs composite materials by combining multiple organic compounds with specific functions in the light emitting layer - using compounds of Formula 2-1 or 2-2 as host materials and compound of Formula 3 as dopant materials, creating a composite system that achieves synergistic effects for improved performance
2Use of energy by stationary object
If the driving voltage is reduced, then energy consumption decreases, but maintaining efficiency becomes more difficult
Solution Approach 1:
The patent uses parameter changes by optimizing the energy levels and electrical properties of the organic materials through molecular structure design, adjusting HOMO-LUMO gaps and charge transport characteristics to enable low driving voltage operation while maintaining high efficiency
3Reliability
If new organic materials are developed, then efficiency and lifetime can be improved, but material synthesis complexity increases
Solution Approach 1:
The patent applies parameter changes by establishing systematic structure-performance relationships through chemical formula design, where modifications to molecular structures (such as changing R groups, L groups, or functional moieties) can be predicted to affect device performance, enabling rational material design rather than trial-and-error synthesis
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 described organic light emitting device achieves improved efficiency and extended lifetime characteristics by optimizing the compounds in the hole control and light emitting layers, specifically through the use of Chemical Formulas 1, 2-1, and 2-2.
Implementation Method 1
the holes are injected from an anode into the organic material layer and the electrons are injected from the cathode into the organic material layer
Implementation Method 2
the holes are injected from an anode into the organic material layer and the electrons are injected from the cathode into the organic material layer
Implementation Method 3
when the injected holes and electrons meet each other, an exciton is formed, and light is emitted when the exciton falls to a ground state again
Data Source
AI summary
Provided is a compound of Chemical Formula 1:wherein:L11 is a single bond or a substituted or unsubstituted C6-60 arylene;L12 and L13 are each independently a single bond or a substituted or unsubstituted C6-60 arylene;R11 is a substituted or unsubstituted C6-60 aryl;R12 and R13 are each independently any one substituent selected from the group consisting of the following:wherein, each R′ is independently a substituted or unsubstituted C6-60 aryl, andR14 and R15 are hydrogen, or are linked to each other,and an organic light emitting device including the same.