OLED Blue Emission Layer with Interlayer for Low Driving Voltage
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Solution Overview
Problem
Existing organic light-emitting devices (OLEDs) face challenges in achieving high emission efficiency and low driving voltage due to limitations in the interlayer and emission layer structures, which affect the overall performance and lifespan of the devices.
Innovation Solution
Incorporating a novel interlayer with a specific compound represented by Formula 1 and a blue emission layer with a compound represented by Formula 4, both with precise thicknesses and structural components, to control hole-transporting rates and emission efficiency, while preventing excessive hole injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional interlayer and emission layer structures are used, then device structure is simple, but emission efficiency is low and driving voltage is high
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of the interlayer (5-20 nm) and selecting specific compounds with particular molecular weights and glass transition temperatures. These parameter adjustments enable precise control of hole-transporting rates, achieving high emission efficiency while maintaining low driving voltage without requiring complex structural modifications
Solution Approach 2:
The patent uses composite materials by combining the interlayer (with compounds of Formula 1) and the blue emission layer (with compounds of Formula 4) to create a multi-layer structure with synergistic effects. This composite approach allows independent optimization of hole transport and light emission functions, resolving the contradiction between emission efficiency and driving voltage
2Reliability
If interlayer thickness is increased to control hole transport, then hole injection is prevented, but device complexity increases
Solution Approach 1:
The patent employs parameter changes by defining a specific thickness range (5-20 nm) for the interlayer, which is sufficient to control hole injection without requiring additional complex structural elements. This single parameter optimization achieves reliable hole transport control while maintaining device simplicity
Solution Approach 2:
The patent applies local quality by assigning specific functional properties to the interlayer region, including compounds with particular molecular weights (200-500 g/mol) and glass transition temperatures (−50°C to 50°C). This localized functional design enables precise hole transport control at the interlayer position without complicating the overall device structure
3Productivity
If emission layer compounds are optimized for high efficiency, then emission efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses parameter changes by selecting a thickness range (5-20 nm) that balances emission efficiency with manufacturing feasibility. This parameter optimization ensures high performance while accommodating standard manufacturing tolerances, avoiding excessive precision requirements
Solution Approach 2:
The patent employs thin film technology by creating an ultrathin interlayer (5-20 nm) that provides sufficient functional control while being compatible with conventional thin-film deposition processes. This approach achieves high emission efficiency without demanding extreme manufacturing precision
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 OLEDs with improved emission efficiency, high brightness, and low driving voltage, enhancing the performance and lifespan of the devices without substantial increases in driving voltage.
Implementation Method 1
Holes injected from the first electrode move to the EML via the HTL, and electrons injected from the second electrode move to the EML via the ETL. Carriers such as the holes and the electrons recombine in the EML to generate excitons. When excitons drop from an excited state to the ground state, light is emitted.
Data Source
AI summary
Provided is an organic light-emitting device with a blue emission layer. The blue emission layer is an emission layer that emits blue light by a fluorescent emission mechanism. The blue emission layer includes a compound represented by Formula 4 below: