Improving Stacked OLED Stability with Mixed Regions
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Summary
Problems
Stacked OLED configurations face limited operational stability, which affects their performance and longevity in display applications despite achieving high electroluminescence efficiency.
Innovation solutions
Incorporating a mixed region with a mixture of materials having different electron and hole transport capacities, along with optional dopants, between luminescent regions in a stacked OLED configuration, where the materials can be independently selected from hole transport, electron transport, and bipolar transport materials, to enhance charge transport and stability.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If stacked OLED configurations are used to achieve high electroluminescence efficiency, then brightness and efficiency are improved, but operational stability deteriorates
Why choose this principle:
The patent introduces a mixed region with specific local composition between luminescent regions, where materials are selectively combined to optimize charge transport properties in critical areas without altering the overall stacked structure. This local modification improves operational stability while preserving the high efficiency benefits of the stacked configuration.
Principle concept:
If stacked OLED configurations are used to achieve high electroluminescence efficiency, then brightness and efficiency are improved, but operational stability deteriorates
Why choose this principle:
The patent employs composite materials in the mixed region, combining multiple organic materials with different electron and hole transport capacities. This composite approach creates a balanced charge transport environment that enhances device stability while maintaining high electroluminescence efficiency in the stacked OLED structure.
Application Domain
Data Source
AI summary:
Incorporating a mixed region with a mixture of materials having different electron and hole transport capacities, along with optional dopants, between luminescent regions in a stacked OLED configuration, where the materials can be independently selected from hole transport, electron transport, and bipolar transport materials, to enhance charge transport and stability.
Abstract
A stacked OLED device comprises a plurality of individual OLEDs in a vertical stacked arrangement separated by intermediate electrodes, wherein at least one of the individual OLEDs includes a light emitting region or zone comprising a mixed region; the mixed region comprising a mixture of a hole transport material, an electron transport material, and optionally a dopant.