Organometallic OLED Compounds 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, and conventional methods for producing white light often require complex stack structures or absorption filters, which can be inefficient.
Innovation Solution
Development of a compound with a first ligand LA coordinated to a metal M through a structure of Formula I, which can be used in an OLED to enhance emission of specific colors and simplify the device structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional methods use white OLED with absorption filters to produce saturated colors, then color display capability is achieved, but device complexity and inefficiency increase due to additional filter layers
Solution Approach 1:
The patent extracts and eliminates the absorption filter layers from the conventional white OLED structure. By developing emissive materials that directly emit saturated red, green, and blue colors, the invention removes the unnecessary filter components while maintaining color display capability, thereby reducing device complexity and improving efficiency
Solution Approach 2:
The invention changes the emission parameters of the OLED by developing novel organic electroluminescent materials with specific molecular structures (Formulas 1-4) that inherently emit saturated colors. This parameter change in material composition enables direct color emission without requiring optical filters, resolving the contradiction between color saturation and device complexity
2Adaptability or versatility
If conventional OLEDs use complex stack structures to achieve full color display, then color range is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent develops emissive materials that can directly provide multiple saturated colors (red, green, blue) through different molecular structures. This multi-functional approach allows a single emissive layer to replace multiple functional layers in conventional stacks, simplifying manufacturing while maintaining full color display capability
Solution Approach 2:
The invention employs organic materials that can be deposited using solution processing techniques, which are simpler and more cost-effective than vacuum deposition required for conventional inorganic OLED structures. The organic emissive materials enable color display without requiring complex, expensive stack structures
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 emission of saturated colors in OLEDs, reducing the complexity of device design and improving color accuracy without the need for additional filters.
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 to at least one ligand comprising a 5-membered aromatic ring with is bonded with a direct bond to a 6-membered aromatic ring. 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.