Ion-Injected Barrier for OLED Outgassing Prevention
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Solution Overview
Problem
Organic light emitting display devices face issues with outgassing of gas or moisture from the organic layer and external gas penetration into the emitting layer, which can reduce the device's lifetime.
Innovation Solution
The implementation of ion injected layers, specifically BHx+ or PH+ ions injected into the pixel defining layer and planarization layer, which are heated to form a thickness of 2000 Å to 3000 Å, acts as a barrier to prevent gas discharge and external gas penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If organic layers are used in the display device, then the device can be made thin and driven at low voltage, but gas or moisture outgassing from organic layers reduces device lifetime
Solution Approach 1:
An ion-injected layer is introduced as an intermediary barrier between the organic layer and the organic light-emitting layer. This layer, formed by injecting ions (such as boron or phosphorus ions) into a specific layer, acts as a protective mediator that prevents gas and moisture outgassing from reaching the light-emitting layer, thereby extending device lifetime while maintaining the low-voltage operation capability of organic materials
Solution Approach 2:
The physical and chemical parameters of the protective layer are changed through ion injection. By injecting ions at specific concentrations and energies into the layer, its gas barrier properties are enhanced without significantly altering its other functional properties, allowing it to serve as an effective barrier while maintaining compatibility with the organic light-emitting structure
2Temperature
If organic layers are used in the display device, then the device can be made thin and driven at low voltage, but external gas penetration into the emitting layer reduces device lifetime
Solution Approach 1:
The ion-injected layer serves as an intermediary protective barrier that blocks external gas and moisture from penetrating into the organic light-emitting layer. This mediator layer maintains the benefits of organic materials (thin structure and low-voltage operation) while providing the necessary protection against environmental degradation
3Reliability
If ion injected layer is formed by heating and ion injection, then gas barrier property is improved, but manufacturing process complexity increases
Solution Approach 1:
The protective layer is prepared in advance by forming it on the substrate before depositing the organic light-emitting layers. The ion injection process is performed as a preliminary treatment to endow the layer with gas barrier properties before it comes into contact with the sensitive organic materials, simplifying the overall manufacturing sequence
Solution Approach 2:
By optimizing the ion injection parameters (ion type, energy, concentration, and injection timing), the gas barrier property of the protective layer is significantly improved. The heating temperature and ion injection conditions are carefully controlled to achieve the desired barrier properties while minimizing process complexity and maintaining compatibility with subsequent organic layer deposition
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 solution effectively prevents outgassing from the organic layers, thereby extending the lifetime of the organic light emitting display device by blocking gas and moisture from entering or escaping, ensuring stable operation.
Implementation Method 1
An organic electroluminescent device (e.g., organic light emitting display device), according to a material that forms an emitting layer (EML)... emits light by electrically exciting a fluorescent organic compound
Implementation Method 2
a first ion injected layer formed on the PDL... formed by injecting ions into the PDL... the first ion injected layer may prevent gas from being discharged from the PDL
Data Source
AI summary
An organic light emitting display device capable of preventing outgassing from a pixel defining layer (PDL) or a planarization layer and method of manufacturing the same.