OLED Organometallic Emitters for Saturated Color Without Filters
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue pixel emissions required for full color displays, with conventional methods relying on absorption filters leading to inefficiencies.
Innovation Solution
Development of a compound with a specific ligand structure coordinated to a metal, which can be used in an OLED layer to directly emit saturated colors or be combined with color altering layers to achieve desired color outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional absorption filters are used to produce saturated colors in OLED displays, then color saturation can be achieved, but energy efficiency deteriorates due to light absorption losses
Solution Approach 1:
The patent extracts and eliminates the absorption filter component from the OLED display system. Instead of using filters to achieve saturated colors, the invention directly incorporates emissive materials that emit saturated red, green, and blue light from the organic layers themselves, removing the source of energy loss associated with filter absorption.
Solution Approach 2:
The conventional approach uses white light emission filtered through absorption layers to produce saturated colors. This invention inverts the approach by directly emitting saturated colors from the organic emissive layers without requiring white light generation and subsequent filtering, thereby eliminating the harmful absorption process.
2Illumination intensity
If absorption filters are used to achieve saturated color emissions, then color quality is improved, but device complexity increases due to additional filter layers
Solution Approach 1:
The patent removes the absorption filter layers from the OLED structure, simplifying the device architecture. The saturated color emission is achieved directly from the organic emissive materials, eliminating the need for complex multi-layer filter structures and reducing overall device complexity.
Solution Approach 2:
The organic emissive layers perform multiple functions simultaneously: they generate light and directly emit saturated colors without requiring separate filter components. This multi-functionality integrates the color generation process into the emission process itself, reducing structural complexity.
3Ease of manufacture
If conventional materials are used in OLEDs, then manufacturing cost is reduced, but performance efficiency deteriorates in achieving saturated color emission
Solution Approach 1:
The patent modifies the chemical parameters and molecular structures of the organic emissive materials to achieve saturated color emission directly. By changing the molecular composition and electronic properties of the organic compounds, the invention enables efficient saturated color generation without requiring complex inorganic materials or additional filter structures, maintaining cost-effectiveness while improving performance.
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 compound enables efficient, direct emission of saturated colors in OLEDs, reducing the need for filters and enhancing display performance.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Provided are organometallic compounds comprising a central metal atom which is coordinated by at least one ligand which is at least two-dentate and which comprises at least two 5-membered to 10-membered carbocyclic or heterocyclic rings. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these organometallic compounds.