OLED Hole Injection Layer Nano-Reticular Structure
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Solution Overview
Problem
Conventional organic electroluminescent devices suffer from poor contact between the hole injection layer and adjacent layers, leading to reduced hole injection efficiency and luminescent brightness due to low contact area.
Innovation Solution
Incorporating an azo initiator into the hole injection layer, which decomposes to form a nano-reticular structure upon heating, increasing the contact interface area between the hole injection layer and adjacent layers, thereby enhancing hole injection efficiency and luminescent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional hole injection layer is used with flat surface structure, then the device structure is simple and easy to manufacture, but the contact area between layers is small resulting in poor hole injection efficiency
Solution Approach 1:
The patent applies porous materials by incorporating an azo initiator into the hole injection layer that decomposes upon heating to form a nano-reticular (porous) surface structure. This porous structure dramatically increases the contact area between the hole injection layer and adjacent layers, thereby improving hole injection efficiency without requiring complex manufacturing processes
Solution Approach 2:
The patent changes the physical and chemical parameters of the hole injection layer by introducing an azo initiator component and applying thermal treatment. The azo initiator decomposes at specific temperatures to create the nano-reticular structure, transforming the flat surface into a high-surface-area porous structure that enhances interfacial contact and hole injection performance
2Manufacturing precision
If the contact area between hole injection layer and adjacent layer is increased by creating nano-reticular structure, then hole injection efficiency and luminescent brightness are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The azo initiator acts as an intermediary substance that facilitates the formation of the nano-reticular structure. It is incorporated into the hole injection layer and decomposes upon heating to create the porous surface morphology, serving as a mediator that transforms the flat surface into a high-contact-area structure through a straightforward thermal processing step
Solution Approach 2:
The patent utilizes phase transitions, specifically the thermal decomposition of the azo initiator, to transform the hole injection layer surface from a flat state to a nano-reticular porous state. This phase transition occurs during the standard thermal processing step, creating the desired high-surface-area structure without adding complex manufacturing operations
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 nano-reticular structure significantly improves hole injection efficiency and luminescent brightness by increasing the contact area and recombination probability between holes and electrons.
Implementation Method 1
the surface of the hole injection layer connecting to the light emitting layer has a nano-reticular structure formed by thermal decomposition of the azo initiator
Implementation Method 2
Organic electroluminescent devices, also known as organic light emitting diodes (OLEDs), are a type of devices which can directly convert electric energy to light energy
Data Source
AI summary
An organic electroluminescence device comprises the following structure: a conductive base (110), a hole injection layer (120), a light emission layer (140), and a cathode layer (170) are laminated in sequence. The material of the hole injection layer (120) comprises a conductive polymer and an azo initiator. A nano-network structure is provided on the connecting surface of the hole injection layer (120) and the light emission layer (140). After being heated to a higher temperature, the azo initiator can be decompounded to release N2, thus the nano-network structure is formed on the surface of the hole injection layer (120). The nano-network structure can efficiently increase the contacting area of the hole injection layer (120) and the adjacent layer. The injection efficiency of the hole is improved. A manufacturing method of the organic electroluminescence device is also provided.