Iridium Complex Composition Below 5 ppm Halogen for OLED Durability
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Solution Overview
Problem
Existing iridium complexes are susceptible to halogen atoms, leading to reduced durability and stability in organic light-emitting elements.
Innovation Solution
A composition containing an iridium complex with a specific ligand structure and electron-withdrawing substituents, limiting halogen content to less than 5 ppm, enhances molecular stability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If halogen atoms are present in the iridium complex composition, then the complex can be synthesized more easily, but the durability and stability of the organic light-emitting element deteriorates
Solution Approach 1:
The patent applies parameter changes by strictly controlling the halogen content to less than 5 ppm, transforming the synthesis approach from one that tolerates halogen presence to one that achieves ultra-low halogen levels through optimized reaction conditions and purification processes
Solution Approach 2:
The patent converts the harmful effect of halogen atoms into a beneficial control parameter by establishing that keeping halogen content below 5 ppm transforms what would be a detrimental presence into a controlled variable that ensures both synthesis feasibility and device durability
2Reliability
If halogen content is reduced to less than 5 ppm, then the durability and molecular stability improve, but the synthesis and purification processes become more complex
Solution Approach 1:
The patent establishes a specific parameter threshold (halogen content < 5 ppm) that balances purification complexity with durability benefits, providing a clear target for synthesis optimization without requiring complete halogen elimination
Solution Approach 2:
The patent applies partial action by not requiring complete elimination of halogen atoms but rather achieving sufficient reduction to below 5 ppm, which is enough to improve durability without necessitating excessively complex purification procedures
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 iridium complex improves the operating lifetime and durability of organic light-emitting elements by reducing halogen-induced side reactions and enhancing molecular stability.
Implementation Method 1
Currently, the use of phosphorescence has been proposed as an attempt to improve the light emission efficiency of organic EL elements
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
The present disclosure provides a composition containing an iridium complex represented by general formula (1) below and a halogen atom. The content of the halogen atom is less than 5 ppm. In general formula (1), R8 to R20 are each a hydrogen atom or a substituent. R14 is an electron-withdrawing substituent having a Hammett constant σm of 0.3 or more, and R1 to R7 are each a hydrogen atom or a methyl group.