Pt and Pd OLED Emitters for Saturated RGB Without Filters
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue colors for full color displays, and conventional methods for white light emission often require complex stack structures or absorption filters, which can be inefficient.
Innovation Solution
The development of a specific organometallic compound, represented by Formula I, which can be used in OLEDs to emit light efficiently, allowing for the production of saturated colors without the need for complex stack structures or absorption filters, by incorporating a compound with defined ring structures and metal centers such as Pt or Pd.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional methods using white backlight with absorption filters are used, then full color display can be achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple emissive layers containing different organometallic compounds (emitting red, green, and blue colors) into a single OLED structure. This merging of multiple color-emitting functions into one device eliminates the need for separate white backlight and absorption filters, thereby reducing device complexity while maintaining full color display capability
Solution Approach 2:
The invention extracts and eliminates the absorption filter components from the conventional display structure. By using organometallic compounds that directly emit saturated colors through electroluminescence, the patent removes the need for absorption filters that would otherwise be required to generate saturated colors from white light
2Device complexity
If organometallic compounds are used to emit saturated colors directly, then device complexity is reduced, but achieving efficient emission of all three primary colors simultaneously remains challenging
Solution Approach 1:
The patent applies local quality by using different organometallic compounds with specific ligand structures in different emissive layers to achieve saturated red, green, and blue emissions. Each layer is locally optimized with compounds having specific molecular structures (Formula I with variations in rings C and D, Z1 and Z2, K1-K4, and substituents) to emit the desired saturated color, while the overall device structure remains simplified
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 organometallic compound enables efficient emission of saturated colors in OLEDs, simplifying the manufacturing process and potentially reducing costs and complexity in producing full color displays.
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 based on platin or palladium and their various uses including as emitters in devices having the structure of Formula I comprising at least four rings as defined herein. Also provided are formulations comprising these compounds. Further provided are organic light emitting devices and related consumer products that utilize these compounds.