Transparent OLED Chiral Emitter Quarter-Wave Plate Polarization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLEDs with polarizers to generate polarized electroluminescent spectra suffer from decreased device efficiency due to photon filtering, which affects the quality of mobile and full-color displays.
Innovation Solution
Incorporating optically pure chiral luminescent metal complexes in transparent OLEDs to produce circularly polarized light, which is then converted to linearly polarized light using a quarter-wave plate, allowing for controlled one-side emissive displays without filtering natural background light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizer is coupled to a transparent electrode of an OLED to filter unwanted reflected light, then linearly or circularly polarized light is yielded, but the device efficiency of the OLED decreases due to filtering some of the emitted photons
Solution Approach 1:
The patent changes the polarization state parameter of the emitted light by using chiral luminescent metal complexes that inherently emit circularly polarized light, rather than using linear polarizers to filter light. This parameter change from linear to circular polarization enables the use of quarter-wave plates instead of linear polarizers, eliminating photon filtering losses.
Solution Approach 2:
The patent introduces a quarter-wave plate as an intermediary optical element between the OLED and the viewer. This quarter-wave plate converts the circularly polarized light from the chiral emitter into linearly polarized light, serving as a mediator that achieves the desired polarization effect without requiring traditional linear polarizers that cause energy loss.
2Illumination intensity
If a polarizer is used to generate polarized electroluminescent spectra, then the desired polarized emission is achieved, but photon loss occurs reducing outcoupling efficiency
Solution Approach 1:
The patent performs preliminary action by designing the OLED to emit circularly polarized light directly at the source using chiral luminescent metal complexes, before the light reaches any optical elements. This preliminary generation of circularly polarized light eliminates the need for subsequent filtering actions that would cause photon loss.
Solution Approach 2:
The patent substitutes the mechanical filtering system (linear polarizers that physically block photons) with an optical conversion system (chiral emitters + quarter-wave plate) that transforms the polarization state without blocking photons, thereby replacing a lossy mechanical approach with a more efficient optical approach.
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
This approach enhances the outcoupling efficiency of OLEDs by eliminating photon loss from polarizers and improving illumination intensity, while maintaining the desired polarized emission.
Implementation Method 1
a transparent organic light emitting device and a quarter-wave plate. The transparent organic light emitting device includes a chiral complex emitter and produces circularly polarized light
Implementation Method 2
the quarter-wave plate converts the circularly polarized light into linearly polarized light
Data Source
AI summary
A light emitting device includes a transparent organic light emitting device and a quarter-wave plate. The transparent organic light emitting device includes a chiral complex emitter and produces circularly polarized light, and the quarter-wave plate converts the circularly polarized light into linearly polarized light. Generating linearly polarized light includes generating circularly polarized light via a transparent organic light emitting device including a chiral complex emitter, and passing the circularly polarized light through a quarter-wave plate to yield linearly polarized light.