Complex Metal Oxide Hole Injection Layer for QLED Stability
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Solution Overview
Problem
Quantum dot light emitting diodes (QLED) performance is heavily dependent on the properties of single materials used in the hole injection layer, making it susceptible to variations in deposition conditions, which affects the interfacial performance and overall efficiency.
Innovation Solution
A light emitting device with a hole injection layer comprising a complex metal oxide film made from at least two partially oxidized metal oxides, which reduces the influence of deposition conditions and material properties, enhancing the synergistic effect and injection capability by forming a p-n heterojunction and improving the device's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single material is used for the hole injection layer, then the device structure is simple, but the performance is heavily dependent on deposition conditions and material properties
Solution Approach 1:
The patent employs composite metal oxide materials (such as NiOx-MoO3-y, NiOx-WO3-z, or NiOx-V2O5-w) in the hole injection layer instead of single materials. This composite approach reduces dependence on deposition conditions and material properties by combining multiple metal oxides with complementary characteristics, thereby improving performance stability while maintaining reasonable structural complexity
Solution Approach 2:
The patent utilizes partial oxidation of metal layers to create metal oxide films with controlled oxidation states (where x, y, z, w are less than 2). By controlling the oxidation parameters and creating non-stoichiometric compositions, the device achieves better injection capability and reduced sensitivity to deposition variations
2Ease of manufacture
If single material is used in hole injection layer, then manufacturing process is simple, but injection capability is limited
Solution Approach 1:
The patent uses composite metal oxide systems (NiOx combined with MoO3-y, WO3-z, or V2O5-w) that provide synergistic effects for enhanced hole injection. The combination of P-type (NiOx) and N-type metal oxides creates favorable energy level alignment and improves injection capability while maintaining manufacturability through established deposition techniques
Solution Approach 2:
The patent creates localized p-n heterojunctions within the hole injection layer by combining metal oxides with different electrical properties. This local heterostructure formation provides targeted improvement in injection capability at critical interfaces without requiring complete restructuring of the entire device
3Reliability
If complex metal oxide film with multiple metal oxides is used, then synergistic effect and injection capability are improved, but device complexity increases
Solution Approach 1:
The patent employs composite metal oxide materials (such as NiOx-MoO3-y, NiOx-WO3-z, or NiOx-V2O5-w) in the hole injection layer instead of single materials. This composite approach reduces dependence on deposition conditions and material properties by combining multiple metal oxides with complementary characteristics, thereby improving performance stability while maintaining reasonable structural complexity
Solution Approach 2:
The patent uses NiOx as a universal component combined with different N-type metal oxides (MoO3-y, WO3-z, V2O5-w) to achieve multiple functions: hole transport, interface engineering, and energy level alignment. This multi-functional approach improves device performance without proportionally increasing complexity
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 use of a complex metal oxide film with partially oxidized metal oxides in the hole injection layer improves the injection capability and reduces the dependence on single material properties, leading to enhanced performance and stability in QLED devices.
Implementation Method 1
the hole injection layer comprises a complex metal oxide film comprising two metal oxides that is at least partially oxidated
Implementation Method 2
the complex metal oxide film comprises a metal oxide capable of forming a p-n heterojunction
Implementation Method 3
depositing a complex metal layer, and then performing at least partial oxidation treatment on the composite metal layer to form a complex metal oxide film
Data Source
AI summary
The present disclosure relates to a light emitting device, a method for preparing the same and a display device. The light emitting device includes a cathode layer, a quantum dot light emitting layer, a hole injection layer and an anode layer which are laminated. The hole injection layer includes a complex metal oxide film comprising two metal oxides that is at least partially oxidated.