OLED Auxiliary Layers for Resonance Cycle Adjustment
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Solution Overview
Problem
Organic light emitting devices (OLEDs) face challenges in achieving high efficiency, long lifetime, and excellent color purity for red and green light emission due to difficulties in adjusting the resonance cycle of these colors, leading to losses in light emitting efficiency and color coordinate alignment with blue light.
Innovation Solution
Incorporating auxiliary layers with materials different from the hole injection layer, specifically between the hole injection layer and the red and green emissive layers, to adjust the resonance cycle of red and green light, respectively, thereby optimizing light emitting efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If auxiliary layers are added to adjust resonance cycle of red and green light, then color purity and light emitting efficiency are improved, but device complexity increases
Solution Approach 1:
The patent introduces auxiliary layers as intermediary components between the hole injection layer and the red/green emissive layers. These auxiliary layers serve as mediators to adjust the resonance cycle of red and green light, enabling precise control over color purity and light emitting efficiency without requiring fundamental changes to the overall device structure.
Solution Approach 2:
The auxiliary layers are selectively positioned only where needed - specifically between the hole injection layer and the red/green emissive layers, but not necessarily with the blue emissive layer. This localized approach allows precise adjustment of color properties for red and green emissions while maintaining structural simplicity elsewhere in the device.
2Productivity
If auxiliary layers are added to adjust resonance cycle of red and green light, then light emitting efficiency is improved, but device complexity increases
Solution Approach 1:
The auxiliary layers function as intermediary components that optimize the optical resonance conditions for red and green light emission. By introducing these specialized layers, the device achieves enhanced light emitting efficiency through improved resonance control without requiring a complete redesign of the device architecture.
Solution Approach 2:
The auxiliary layers enable precise adjustment of optical parameters - specifically the resonance cycle of red and green light. By changing the optical parameters through these auxiliary layers, the device achieves higher light emitting efficiency while maintaining a relatively simple structural configuration.
3Manufacturing precision
If auxiliary layers with different materials are used, then resonance cycle adjustment is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs different materials for auxiliary layers based on their specific functional requirements - the first auxiliary layer uses a material optimized for red light resonance cycle adjustment, while the second auxiliary layer uses a material optimized for green light. This localized material selection achieves precise resonance control without requiring complex manufacturing processes across the entire device.
Solution Approach 2:
The auxiliary layers with different materials serve as intermediary components that facilitate precise resonance cycle adjustment for different colors. By using material-specific intermediaries, the manufacturing process can leverage established techniques for depositing different organic materials in sequential layers, maintaining ease of manufacture while achieving high 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 low turn-on voltage, high current density, high luminance, high power efficiency, and extended lifetime, while maintaining excellent color purity for red and green light emission.
Implementation Method 1
an auxiliary layer for adjusting the resonance cycle of red light and/or green light
Data Source
AI summary
Organic light emitting devices (OLEDs) are provided. An exemplary OLED includes a substrate, a first electrode, a second electrode, and an organic layer between the first and second electrodes having a hole injection layer and an emissive layer. The emissive layer includes red, green and blue emissive layers. The organic layer further includes an auxiliary layer selected from a first auxiliary layer between the hole injection layer and the red emissive layer for adjusting the resonance cycle of red light, a second auxiliary layer between the hole injection layer and the green emissive layer for adjusting the resonance cycle of green light, and combinations thereof. The material of the auxiliary layer is different from the material of the hole injection layer. The organic light emitting device has low turn-on voltage, high current density, high luminance, high current efficiency, high power, long life-time, and excellent color purity.