OLED Emissive Compounds for Saturated RGB Without Color 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 specific structure (Formula I) comprising Pt or Pd, monocyclic or polycyclic fused rings, and various substituents, which can be used in an OLED's organic layer to enhance color emission, potentially eliminating the need for complex stack structures and absorption filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional white OLED structures with absorption filters or multi-layer stacks are used, then white light emission can be achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and eliminates the need for separate absorption filters and complex multi-layer stacks by incorporating color-selective emission directly into the emissive layer through the use of specific organic compounds that can emit saturated red, green, and blue light when voltage is applied
Solution Approach 2:
The emissive layer is designed to perform multiple functions simultaneously - generating white light through electroluminescence while also providing color selection through the molecular structure of the organic compounds, thereby replacing what would traditionally require separate filtering layers
2Illumination intensity
If conventional white OLED structures with absorption filters are used, then white light emission can be achieved, but manufacturing difficulty and cost increase
Solution Approach 1:
The patent removes the manufacturing complexity associated with depositing multiple thin film layers and integrating absorption filters by using a single emissive layer with specifically designed organic compounds that inherently provide the required color emission characteristics
Solution Approach 2:
The patent changes the fundamental parameter of light generation from passive filtering of white light to active emission of saturated colors through electroluminescence, simplifying the manufacturing process to a single layer deposition
3Manufacturing precision
If conventional color production methods are used, then saturated colors can be achieved, but device structure becomes more complex
Solution Approach 1:
The patent extracts the color selection function from separate optical filters and integrates it directly into the emissive material itself, allowing the organic compounds to emit saturated red, green, and blue light directly when electrically excited
Solution Approach 2:
The patent replaces the mechanical/optical filtering system with an electrical system where voltage applied across the organic emissive layer directly generates the desired colors through electroluminescence, eliminating the need for physical filter layers
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 production of saturated red, green, and blue pixels directly, simplifying the OLED structure and improving color accuracy without the need for additional filtering layers.
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 as a central metal atom either a platinum or a palladium atom which is coordinated by a tetradentate ligand. Also provided are formulations comprising these organometallic compounds. Further provided are organic light emitting devices (OLEDs) as well as related consumer products that utilize these organometallic compounds.