Iridium OLED Emitters for Saturated Color Without 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, with conventional methods relying on absorption filters leading to inefficiencies.
Innovation Solution
Development of a compound of Formula Ir(LA)x(LB)y(LC)z, where x, y, and z are defined, with specific ligands LA, LB, and LC, to create a metal coordination complex suitable for OLEDs, enabling direct emission of saturated colors without the need for filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional absorption filters are used to produce saturated colors from white OLED emission, then color saturation can be achieved, but device efficiency deteriorates and manufacturing complexity increases
Solution Approach 1:
The patent extracts and eliminates the color filter component from the OLED device structure. Instead of using absorption filters to achieve color saturation, the invention directly emits saturated colors through specifically designed organic emissive materials with tailored emission spectra, thereby removing the source of energy loss associated with filtered light
Solution Approach 2:
The patent changes the fundamental parameter of color generation from spectral filtering to direct emission. By modifying the emission characteristics of the organic material itself through molecular design and selection, the device transitions from a filter-based approach to a material-based approach, achieving color saturation without energy loss
2Illumination intensity
If conventional absorption filters are used to produce saturated colors from white OLED emission, then color saturation can be achieved, but device complexity deteriorates
Solution Approach 1:
The patent removes the color filter layer and its associated manufacturing steps from the OLED device. The structure is simplified from multiple layers including filters to a more straightforward configuration using directly emissive materials, reducing both device complexity and manufacturing difficulty
Solution Approach 2:
The patent employs organic emissive materials that simultaneously achieve multiple functions: they generate light, provide color saturation, and eliminate the need for separate filtering components. This multi-functionality consolidates what would otherwise require separate discrete components into a single material system
3Adaptability or versatility
If white OLED with absorption filters is used, then color display capability is achieved, but productivity deteriorates due to additional manufacturing steps
Solution Approach 1:
The patent extracts and removes the color filter manufacturing steps from the production process. By using directly emissive materials that provide color saturation intrinsically, the number of manufacturing steps is reduced, thereby improving productivity and manufacturing efficiency while maintaining full color display capability
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 allows for direct emission of saturated colors, improving efficiency and reducing the complexity of OLEDs by eliminating the need for color filters, thereby enhancing display performance.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A heteroleptic compound of Formula Ir(LA)x(LB)y(LC)z is provided where first ligand LA comprises a structure of Formula I,ligand LB comprises a structure selected from the group consisting of:and ligand LC is a bidentate ligand. In these structures, moiety A is a monocyclic ring or a polycyclic fused ring system; moiety B is a polycyclic fused ring system; each of Z1 to Z4 and X1 to X8 is C or N; each of K1 and K2 is a direct bond or a linking group; K is a linking group; L is a direct bond or a linking group; Y is a linking group; and each substituent is H or a General Substituent defined herein. Also provided is a metal coordination complex that comprises a ligand selected from the group LB consisting of LB-1, LB-2, LB-3, LB-4, LB-5, LB-6, and LB-7 as defined herein. Formulations, OLEDs, and consumer products containing the compounds are further provided.