Platinum Palladium Tetradentate Ligand OLED Emitter Narrow FWHM
Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated color emission, particularly in red, green, and blue pixels, which is crucial for full-color displays, as existing materials and methods struggle to produce high color purity and efficiency.
Innovation Solution
A compound of Formula I, where M is Pd or Pt, with specific ligand configurations and substitutions, is used in an OLED structure to enhance emission properties, allowing for improved color coordination and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional OLED materials are used, then device fabrication is simpler, but color purity and emission saturation are insufficient
Solution Approach 1:
The patent applies parameter changes by systematically varying the chemical structure parameters of the OLED emitter materials. Specifically, it uses platinum(II) or palladium(II) coordinated to N^C^P^ or N^N^P^ ligands with different substituent groups (R1-R4, RA-RC) to tune the emission properties. By changing the ligand composition and substitution patterns, the patent achieves narrow FWHM (full width at half maximum) emissions with high color purity while maintaining reasonable device fabrication complexity
Solution Approach 2:
The patent employs composite materials by creating coordination compounds that combine multiple elements: platinum(II) or palladium(II) metal centers coordinated to organic ligands containing nitrogen and phosphorus atoms. These composite molecular structures integrate the properties of different chemical components to achieve both narrow emission bandwidth and stability, resolving the contradiction between color purity and material complexity
2Manufacturing precision
If white OLED with absorption filters is used, then saturated colors can be achieved, but device efficiency and complexity increase
Solution Approach 1:
The patent extracts the color filtering function from the device structure by directly incorporating color-emitting properties into the emissive layer materials themselves. Instead of using a white OLED with absorption filters to achieve saturated colors, the invention uses emitter materials that inherently emit narrow-band, saturated colors, thereby eliminating the energy loss associated with absorption filtering while maintaining color saturation
Solution Approach 2:
The patent changes the emission parameters of the OLED by using platinum(II) or palladium(II) coordination compounds with specific ligand structures that produce narrow FWHM emissions. This direct emission approach with tuned spectral properties eliminates the need for post-emission color filtering, reducing energy loss while achieving the desired color saturation
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 OLEDs to produce emissions with narrow full width at half maximum (FWHM), thereby achieving better color purity and efficiency for display applications.
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 either a Pt or a Pd as the central metal 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.