Semiconducting Layer with Metal Borate Dopants for OLED Charge Balance
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Solution Overview
Problem
Existing organic light-emitting diodes (OLEDs) face challenges in achieving balanced charge injection and transport, leading to inefficiencies and reduced device lifetime, particularly in optoelectronic devices like OLED displays and photovoltaic cells.
Innovation Solution
Incorporating a semiconducting layer with a charge transport matrix compound covalently bound to an electrical dopant containing a metal cation and an anionic ligand with covalently linked boron atoms, which acts as a charge injection, transport, or generation layer to enhance electrical conductivity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic charge transport materials are used in OLEDs, then the device structure is simple and ease of manufacture is good, but charge injection and transport are unbalanced leading to poor efficiency and reduced device lifetime
Solution Approach 1:
The patent employs composite materials by combining organic charge transport materials with inorganic metal borate complexes as electrical dopants. This composite approach enables balanced charge injection and transport while maintaining manufacturing simplicity, directly resolving the contradiction between improving device efficiency and avoiding increased complexity.
Solution Approach 2:
The patent changes the electrical parameters of the charge transport layer by introducing metal borate complex dopants with specific properties (metal cations and anionic ligands with covalently bonded boron atoms). This parameter modification optimizes charge transport characteristics to achieve balanced injection and transport, improving efficiency without complicating the device structure.
2Reliability
If conventional charge transport materials are used, then manufacturing process is simple, but device lifetime is reduced due to unbalanced charge injection and transport
Solution Approach 1:
The patent uses composite materials consisting of organic charge transport materials combined with inorganic metal borate complexes. This composite structure improves device lifetime by achieving balanced charge injection and transport while keeping the semiconducting layer composition manageable through the use of well-defined inorganic dopant molecules.
Solution Approach 2:
The metal borate complexes act as intermediary dopants that mediate between the organic charge transport matrix and the electrodes. These intermediaries facilitate balanced charge injection and transport, extending device lifetime without requiring complex multi-component systems.
3Productivity
If metal borate complexes are used as electrical dopants, then charge transport efficiency is improved, but the complexity of material synthesis and device preparation increases
Solution Approach 1:
The patent modifies the electrical properties of charge transport materials by incorporating metal borate complex dopants with specific structural parameters (metal cations and anionic ligands with covalently bonded boron atoms). These parameter changes enhance charge transport efficiency while the dopants can be introduced through standard deposition techniques, maintaining ease of manufacture.
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
This configuration significantly improves the operational voltage, efficiency, and lifetime of OLEDs by balancing charge injection and transport, resulting in superior performance compared to prior art devices.
Implementation Method 1
the electrical dopant comprises at least one metal cation and at least one anionic ligand consisting of covalently bound atoms, wherein the anionic ligand comprises at least two boron atoms linked to each other via a covalent bond, wherein the first semiconducting layer is a charge injection layer, a part of a charge generating layer, a charge transport layer or two or more thereof
Data Source
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Figure 3
AI summary
The present invention relates to an electronic device comprising, between a first electrode and a second electrode, at least one first semiconducting layer, the first semiconducting layer comprising (i) at least one first charge transport matrix compound consisting of covalently bound atoms and (ii) at least one electrical dopant, wherein the electrical dopant comprises at least one metal cation and at least one anionic ligand consisting of covalently bound atoms, wherein the anionic ligand comprises at least two boron atoms linked to each other via a covalent bond, wherein the first semiconducting layer is a charge injection layer, a part of a charge generating layer, a charge transport layer or two or more thereof, method for preparing the same and a display device comprising the same.