Copper Complex Dopant for Charge Generation Layer Efficiency
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Solution Overview
Problem
Optoelectronic components, such as OLEDs and photodetectors, face inefficiencies in converting electrical energy into electromagnetic radiation or vice versa due to limitations in charge carrier separation and transport.
Innovation Solution
Incorporating a copper complex with a specific ligand structure in the organic layer structure of optoelectronic components to enhance charge carrier separation and transport, particularly through the use of a p-doped layer with a copper complex like copper(I) pentafluorobenzoate, which improves conductivity and doping capacity, leading to a charge generation layer sequence that increases the efficiency of charge carrier transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional charge generation layers are used, then the device structure is simpler, but the charge carrier separation and transport efficiency is insufficient
Solution Approach 1:
The patent applies local quality by creating a p-doped layer with copper complex specifically at the charge generation layer interface, rather than uniformly doping the entire device. This localized doping approach enhances charge carrier separation efficiency at the critical interface region where electron-hole pair separation occurs, while keeping the rest of the device structure relatively simple and unchanged.
Solution Approach 2:
The patent changes the chemical composition parameter by introducing copper complex as a dopant into the organic charge generation layer. This parameter change transforms the electrical properties of the layer, significantly improving hole conductivity and charge carrier separation efficiency without fundamentally altering the overall device architecture.
2Reliability
If existing dopants are used in the charge generation layer, then the doping process is established, but the conductivity and doping capacity are limited
Solution Approach 1:
The patent changes the chemical parameter by substituting conventional dopants with copper complex, which has superior doping capacity and conductivity enhancement properties. This parameter change results in significantly improved hole conductivity (by several orders of magnitude) and enhanced charge carrier transport efficiency, while maintaining compatibility with existing OLED manufacturing processes.
3Use of energy by moving object
If conventional materials are used in the active layer, then the processing is straightforward, but the absorption in the visible spectral range is high
Solution Approach 1:
The patent changes the optical parameter by introducing copper complex into the charge generation layer, which reduces parasitic absorption in the visible spectral range compared to conventional materials. This allows more emitted light to escape from the device, improving overall emission efficiency while the copper complex maintains compatibility with standard OLED vacuum deposition processing techniques.
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 copper complex enhances the conductivity and mobility of charge carriers, resulting in high efficiency of optoelectronic components by providing a high number of freely mobile charge carriers and reducing absorption in the visible spectral range, making the components more cost-effective and eco-friendly.
Implementation Method 1
The organic layer structure has a copper complex with at least one ligand... adapted to separate charge carriers of a first charge carrier type from charge carriers of a second charge carrier type... A charge generation layer sequence of this type has a p-doped layer which comprises the above-identified copper complex as a p-dopant
Implementation Method 2
Tunnel processes of charge carriers through the potential barrier can be improved in this way. As a result of the high conductivity and doping capacities, strong band bending can be achieved in the p-doped layer in the vicinity of the potential barrier
Data Source
AI summary
Different embodiments of the optoelectronic component have an organic layer structure for isolating charge carriers of a first charge carrier type and charge carriers of a second charge carrier type. The organic layer structure comprises a copper complex which has at least one ligand with the chemical structure as per a formula (I). In this formula, E1 and E2 are each one of the following elements independently of one another: oxygen, sulphur or selenium. R is chosen from the group comprising: hydrogen or substituted or unsubstituted, branched, linear or cyclic hydrocarbons.