Heteroleptic Iridium OLED Emitters for Saturated Color
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated colors for full-color displays, particularly in red, green, and blue emissions, which are essential for industry standards, and there is a need for improved materials that can efficiently emit light with desired color characteristics.
Innovation Solution
The development of Ir(LA)p(LB)q(LC)r compounds, where LB and LC are different bidentate ligands, with specific structural features such as monocyclic or polycyclic fused ring systems, and substitutions that allow for heteroleptic and tetradentate or hexadentate ligand formation, excluding phenylpyridine-based ligands, to enhance the photoactive properties for OLED applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic materials are used in OLEDs, then the devices can be fabricated with cost advantages and flexibility, but the emission color saturation and efficiency are insufficient for full-color display standards
Solution Approach 1:
The patent modifies the chemical structure of organic emitter molecules by changing parameters such as introducing deuterium atoms, adjusting aromatic ring systems, and modifying substituent groups to optimize emission wavelengths and color saturation while maintaining manufacturing feasibility
Solution Approach 2:
The invention uses composite molecular structures combining multiple aromatic rings, heteroatoms, and substituent groups to create emitters with tailored optical properties that achieve saturated colors while remaining compatible with existing OLED fabrication processes
2Illumination intensity
If white OLED with absorption filters is used to produce saturated colors, then the color saturation can be improved, but the emission efficiency and overall performance deteriorate
Solution Approach 1:
The patent extracts and eliminates the need for absorption filters by directly designing emitters that emit saturated colors in their primary emission, removing the energy-wasting filtering step while maintaining color saturation
Solution Approach 2:
The invention changes the emission parameters of the organic materials by modifying molecular structures to emit at specific wavelengths with high quantum efficiency, achieving saturated colors directly without energy loss through filtration
3Ease of manufacture
If simple organic emitters are used in OLEDs, then the manufacturing process is easier, but the emission efficiency and color quality are insufficient
Solution Approach 1:
The patent optimizes molecular parameters such as HOMO-LUMO energy gaps, substituent positions, and aromatic ring configurations to achieve high emission efficiency while maintaining structural simplicity compatible with standard fabrication processes
Solution Approach 2:
The invention introduces specific functional groups and substituent patterns at localized positions within the molecular structure to enhance emission properties without complicating the overall molecular framework or fabrication process
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
These compounds improve the emission efficiency and color saturation in OLEDs, enabling the production of high-quality, full-color displays by optimizing the energy levels and substituents in the Ir(LA)p(LB)q(LC)r structure, leading to better performance and compliance with industry standards.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
One application for phosphorescent emissive molecules is a full color display
Data Source
AI summary
Heteroleptic compounds having a structure of Ir(LA)p(LB)q(LC)r, where LB and LC are different bidentate ligands, p is 1 or 2, q is 1 or 2, r is 0, 1, or 2, and ligand LA has a structure of Formula I,In Formula I, moiety B is a monocyclic or polycyclic fused ring system; each of X1 to X6 is C or N; each RA, RB, and RC is independently a hydrogen or a general substituent; at least one RB comprises a partially or fully deuterated alkyl or cycloalkyl group; if moiety B is phenyl, at least two adjacent RC substituents are fused to form a ring, with the proviso that at least one LB or LC is present and is not a phenylpyridine-based ligand. Formulations, OLEDs, and consumer products containing the same are also disclosed.