Ir(LA)2(LC) Phosphorescent Molecule for Saturated OLED Emission
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Solution Overview
Problem
Current organic light emitting diodes (OLEDs) face challenges in achieving saturated colors, particularly in red, green, and blue emissions, which are essential for full-color displays, and existing technologies lack efficient phosphorescent emissive molecules that can meet industry standards for color accuracy and performance.
Innovation Solution
The development of a compound, Ir(LA)2(LC), with a specific structure that includes a 5-membered or 6-membered carbocyclic or heterocyclic ring system, di-substitution, and mono-substitution, which is used in the organic layer of OLEDs to enhance color emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic materials are used in OLEDs, then cost advantages and flexibility are achieved, but saturated color emission performance is insufficient
Solution Approach 1:
The patent modifies the molecular structure of phosphorescent emissive molecules by changing parameters such as ring size (5-membered or 6-membered carbocyclic or heterocyclic rings), substitution patterns (di-substitution and mono-substitution), and ligand composition to achieve both saturated color emission and high performance. This structural parameter optimization allows the material to simultaneously meet color accuracy requirements and emission performance standards.
Solution Approach 2:
The invention creates composite phosphorescent emissive molecules combining multiple ligand types (LA and LC ligands coordinated to Ir center) with specific structural features. This composite molecular design integrates different functional components within a single molecule, enabling simultaneous achievement of saturated color emission and high productivity in OLED applications.
2Reliability
If existing phosphorescent emissive molecules are used, then some color emission is achieved, but industry standards for saturated colors and performance are not met
Solution Approach 1:
The patent introduces specific local structural features into the phosphorescent emissive molecules, including particular ring systems (5-membered or 6-membered carbocyclic or heterocyclic), specific substitution positions, and tailored ligand environments around the Ir center. These localized structural modifications precisely control the emission properties to achieve both color saturation and color accuracy required by industry standards.
Solution Approach 2:
The invention systematically varies molecular parameters such as ring size, substitution pattern, and ligand composition to fine-tune the emission characteristics. By optimizing these parameters, the patent achieves phosphorescent emissive molecules that simultaneously deliver color saturation and color accuracy meeting industry standards for full-color displays.
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 Ir(LA)2(LC) improves the color accuracy and performance of OLEDs by enabling the production of saturated red, green, and blue emissions, meeting industry standards for full-color displays and offering enhanced photoactive properties.
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
A compound, Ir(LA)2(LC), having a structure of Formula I,where two adjacent ones of X1, X2, X3, and X4 are C and are joined to a structure of Formula II,by the dashed lines is provided. In Formulas I and II, each of X1 to X4 is C or N; moiety B is a monocyclic ring or a fused ring system; Z is C or N; Y is CRR′, SiRR′, GeRR′, BR, or BRR′; R* is hydrogen or deuterium; each R, R′, RA, RB, R1, R2, and R3 is hydrogen or a General Substituent; RC is selected from a variety of substituents; and any two substituents can be joined or fused to form a ring. Formulations, OLEDS, and consumer products including the compound are also provided.