Iridium OLED Emitter for High-Purity Color
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated color emission, particularly in producing high-purity red, green, and blue colors, which is crucial for advanced display applications, as existing materials often result in less precise color rendition and lower efficiency.
Innovation Solution
A novel compound of Formula I is introduced, comprising specific monocyclic or polycyclic ring systems and bidentate ligands that form a 5- or 6-membered chelate ring with Ir, designed to enhance the energy levels and emission properties, allowing for improved color purity and efficiency in OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional organic materials are used in OLEDs, then the device structure and fabrication process are relatively simple, but the color purity and saturation are insufficient
Solution Approach 1:
The patent applies parameter changes by systematically modifying the molecular structure parameters of organic compounds, specifically incorporating iridium centers with tailored ligands (combining C-N heterocyclic carbene and pyridine moieties) to adjust emission wavelengths and achieve saturated colors across the visible spectrum. This allows precise control over color purity while maintaining reasonable device complexity
Solution Approach 2:
The invention uses composite materials by creating coordination compounds that combine iridium metal centers with organic ligand systems. These composite structures integrate the advantages of both metallic centers (for efficient phosphorescent emission) and organic ligands (for tunable color properties), achieving high color purity through the synergistic interaction of different material components
2Productivity
If conventional organic materials are used in OLEDs, then the material cost is lower, but the emission efficiency and color saturation are reduced
Solution Approach 1:
The patent achieves improved emission efficiency by changing the photophysical parameters of the emissive materials through the use of iridium coordination compounds with specific ligand configurations. The C-N heterocyclic carbene and pyridine ligands are designed to optimize radiative decay rates and minimize non-radiative losses, thereby enhancing overall emission efficiency despite the higher cost of iridium-based materials
3Manufacturing precision
If white OLED with absorption filters is used, then the device structure is simpler, but the color saturation and efficiency are lower
Solution Approach 1:
The patent extracts the color filtering function from the device structure by using emissive materials that directly generate saturated colors without requiring absorption filters. Instead of using a white OLED with color converters, the invention employs separate red, green, and blue emitting iridium coordination compounds that inherently produce saturated colors, eliminating the need for additional filtering layers and improving overall device efficiency
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 high-purity saturated colors with improved efficiency, addressing the limitations of existing materials by optimizing energy levels and emission characteristics.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
Z1 and Z3 form neutral dative bonds to Ir; wherein the moiety represented by is a bidentate ligand, wherein X and Y are selected from the group consisting of B, C, N, O, S, P and Si, X and Y may be the same or different, and are joined by a linker L to form a 5-membered or 6-membered chelate ring
Data Source
AI summary
Provided are organometallic compounds comprising an iridium as the central metal atom which is coordinated by three two-dentate ligands of which two ligands comprise at least two 5-membered to 10-membered carbocyclic or heterocyclic rings. 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.