Enhanced Light Extraction for OLED Efficiency
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Summary
Problems
Current OLED technologies face challenges in optimizing light extraction efficiency, which is crucial for enhancing their performance in display applications.
Innovation solutions
The implementation of an OLED device with an upper waveguide structure and a lower waveguide structure that supports guided modes, featuring a light-extraction waveguide with a rough surface to facilitate mode coupling while minimizing coupling to surface plasmon polaritons, and using agglomerated nanoparticle coatings for enhanced light redirection.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional light extraction methods are used in OLEDs, then device simplicity is maintained, but light extraction efficiency remains suboptimal
Why choose this principle:
The waveguide structure is segmented into multiple functional layers including an upper waveguide structure with the organic light-emitting layer, a lower waveguide structure with the light-extraction waveguide, and a light-extraction matrix with rough upper surface. Each segment performs a specific function in the light extraction process, improving overall efficiency while maintaining modular simplicity.
Principle concept:
If conventional light extraction methods are used in OLEDs, then device simplicity is maintained, but light extraction efficiency remains suboptimal
Why choose this principle:
The light-extraction matrix with its rough upper surface acts as an intermediary between the guided modes in the upper waveguide structure and the lower waveguide structure. It facilitates mode coupling and redirects light without requiring direct complex interactions between the waveguide structures, thereby improving light extraction while maintaining device simplicity.
Application Domain
Data Source
AI summary:
The implementation of an OLED device with an upper waveguide structure and a lower waveguide structure that supports guided modes, featuring a light-extraction waveguide with a rough surface to facilitate mode coupling while minimizing coupling to surface plasmon polaritons, and using agglomerated nanoparticle coatings for enhanced light redirection.
Abstract
An organic light emitting diode (OLED) device having enhanced light extraction is disclosed. The OLED device includes an upper waveguide structure having an organic layer and supports first guided modes, and a lower waveguide structure with a light-extraction waveguide that supports second guided modes substantially matched to the first guided modes. The lower waveguide structure includes a light-extraction waveguide interfaced with a light-extraction matrix. The light-extraction waveguide includes one or more light-redirecting features. The upper and lower waveguide structures are configured to facilitate mode coupling from the first guided modes to the second guide modes while substantially avoiding coupling the first guided modes to surface plasmon polaritons. The light traveling in the second guided modes is redirected to exit the OLED device by light-redirecting features of the light-extraction waveguide.