Platinum Palladium Complexes for Saturated OLED Color Emission
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated colors, particularly in red, green, and blue emissions, which are essential for full-color displays, and often rely on complex stack structures or filtration methods, limiting efficiency and cost-effectiveness.
Innovation Solution
Development of platinum or palladium complexes with tetradentate ligands featuring NN binding motifs, which are incorporated into OLEDs to enhance color emission properties, allowing for the creation of efficient and cost-effective OLEDs with improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional white OLEDs use absorption filters to produce saturated colors, then color display capability is improved, but device complexity and production cost increase
Solution Approach 1:
The patent extracts the color generation function from the optical filtering approach and relocates it to the emissive layer itself. By incorporating platinum or palladium complexes with specific ligands directly into the emissive layer, the molecules emit saturated colors intrinsically without requiring external absorption filters, thus eliminating the filtering components and reducing device complexity
Solution Approach 2:
The patent introduces platinum or palladium complexes as intermediary emissive species within the organic light-emitting diode. These metal complexes act as mediators that receive electrical energy and convert it directly into saturated color emission through phosphorescence, replacing the need for white light generation followed by color filtering
2Manufacturing precision
If conventional OLEDs use stack structures to achieve saturated colors, then color accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the color generation function and the emission function into a single emissive layer component. By designing metal complexes with specific ligands that inherently emit saturated colors, the patent combines what would traditionally require separate stack layers into one integrated functional layer, simplifying the overall device structure
Solution Approach 2:
The patent applies local quality by designing metal complexes with specific ligand configurations tailored for particular color emissions. Each complex is locally optimized with specific ligands (such as those containing nitrogen-donating groups) to emit at specific wavelengths, enabling precise color control within the emissive layer without requiring global structural complexity
3Illumination intensity
If OLEDs use filtration methods to produce saturated colors, then display quality is improved, but production cost increases
Solution Approach 1:
The patent employs organic metal complexes that can be synthesized and processed using solution-based methods, replacing expensive and complex optical filtering components. These molecular emitters are deposited as thin films through conventional organic electronics fabrication techniques, significantly reducing material and manufacturing costs
Solution Approach 2:
The patent changes the fundamental parameter of color generation from optical filtering to molecular emission. By selecting metal complexes with specific ligands that have predetermined emission wavelengths, the patent controls color output through molecular design rather than physical filtering, enabling more cost-effective manufacturing
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 use of these complexes in OLEDs enables the production of OLEDs with improved color accuracy and efficiency, potentially reducing production costs while maintaining high performance standards for full-color displays.
Implementation Method 1
For OLEDs, the organic materials may have performance advantages over conventional materials... One application for phosphorescent emissive molecules is a full color display
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Disclosed are platinum or palladium complexes featuring tetradentate ligands with at least one side that has an NN binding motif are disclosed. The disclosed organometallic compounds have a structure ofwhere M is Pt or Pd. Also provided are formulations comprising these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.