Coordination Compounds for Organic Electronic Device Stability
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Solution Overview
Problem
There is a need to improve the performance of organic semiconductor materials and devices, specifically to achieve better operating voltage, lifetime, and voltage stability, as well as enhanced thermal properties.
Innovation Solution
A compound of formula (I) is introduced, where M is a metal ion with a valency of 1 to 4, L is a ligand, and AL is an ancillary ligand, which are used in organic electronic devices to improve the characteristics of the semiconductor layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic semiconductor materials are used, then device structure and manufacturing process are simple, but operating voltage is high and lifetime is short
Solution Approach 1:
The patent employs composite coordination compounds combining metal ions (Mg, Al, Ga, In, Zn, Ca, Sr, Ba) with organic ligands containing electron-withdrawing groups (sulfonimide, carboxylate, phosphinate). This composite structure creates materials with optimized electronic properties including lower HOMO levels and improved charge transport, directly addressing the contradiction by achieving longer device lifetime through enhanced material performance while maintaining reasonable structural complexity
Solution Approach 2:
The patent systematically varies key parameters including metal ion selection (different valencies and electronic configurations), ligand types (sulfonimide, carboxylate, phosphinate), and substituent groups (fluorinated alkyl, aryl, heteroaryl). These parameter changes enable fine-tuning of HOMO levels, LUMO levels, and charge mobility to optimize device lifetime and operating characteristics while managing structural complexity
2Reliability
If conventional organic semiconductor materials are used, then manufacturing process is simple, but operating voltage stability over time is poor
Solution Approach 1:
The coordination compounds combine metal centers with organic ligands featuring electron-withdrawing groups, creating composite structures with stabilized HOMO levels. This composite approach improves operating voltage stability by reducing HOMO level variability and enhancing material uniformity, directly addressing the voltage stability issue while the modular nature of coordination chemistry keeps structural complexity manageable
Solution Approach 2:
The patent introduces specific functional groups (sulfonimide, carboxylate, phosphinate) at localized positions within the molecular structure to modify electronic properties. These local modifications with electron-withdrawing groups specifically target HOMO level stabilization and charge transport enhancement, improving voltage stability without requiring complete redesign of the entire molecular structure
3Temperature
If conventional organic semiconductor materials are used, then thermal properties are insufficient, but simpler materials would be easier to manufacture
Solution Approach 1:
The coordination compounds combine thermally stable metal ions with robust organic ligands, creating composite materials with enhanced thermal stability. The metal-ligand coordination bonds provide thermal resilience while the organic components maintain processability, directly addressing the thermal property requirement while remaining compatible with standard vacuum deposition and solution processing techniques
Solution Approach 2:
The patent varies metal ion selection (Mg, Al, Ga, In, Zn, Ca, Sr, Ba) and ligand structures to optimize thermal properties. Heavier metal ions and aromatic ligand systems generally provide higher thermal stability, while the modular coordination chemistry approach allows systematic parameter adjustment to balance thermal performance with manufacturing ease
Data Source
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AI summary
The present invention relates to an organic electronic device comprising a semiconductor layer which comprises a compound of formula (1).