OLED Light-Emitting Layer Segmentation for Voltage Reduction
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Solution Overview
Problem
Existing OLEDs with multi-light emitting layer structures require high voltage and complex manufacturing processes due to the large number of layers, leading to high power consumption and increased complexity.
Innovation Solution
A reduced-layer OLED structure is implemented, featuring a first and second carrier transport layer with a light-emitting layer in between, including a hollow and projecting light-emitting sub-layer, where carriers enter through opposite surfaces, eliminating the need for isolation layers and allowing for direct energy transfer between sub-layers to produce mixed colors, thereby lowering voltage and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a multi-light emitting layer structure is used to achieve white light OLED, then color stability and ease of process are improved, but the number of layers increases leading to high voltage requirement and high power consumption
Solution Approach 1:
The light-emitting layer is segmented into a first light-emitting sub-layer and a second light-emitting sub-layer with different energy gaps, allowing each sub-layer to emit different colors that combine to form white light, reducing the total number of layers required
Solution Approach 2:
The first light-emitting sub-layer is positioned within or adjacent to the second light-emitting sub-layer, with the first sub-layer having a hollow structure that accommodates the second sub-layer, creating a nested configuration that reduces overall layer count
2Stability of the object's composition
If a multi-light emitting layer structure is used to achieve white light OLED, then color stability is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
The light-emitting layer is divided into two sub-layers with distinct functions, simplifying the manufacturing process by reducing the total number of layers that need to be deposited and processed
Solution Approach 2:
The nested structure of the first and second light-emitting sub-layers allows for simplified manufacturing by reducing the number of separate deposition steps and isolation layer requirements
3Illumination intensity
If a multi-light emitting layer structure is used, then white light emission is achieved, but the number of layers increases requiring high voltage to drive carriers
Solution Approach 1:
The light-emitting layer is segmented into sub-layers with different energy gaps, allowing carriers to recombine in different regions to produce white light, reducing the voltage required compared to a single thick light-emitting layer
Solution Approach 2:
The nested configuration of the first and second light-emitting sub-layers creates efficient carrier transport paths, reducing the voltage requirement by minimizing the distance carriers must travel through multiple layers
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 reduces power consumption, simplifies the manufacturing process, and enhances the stability and efficiency of the OLED by allowing direct energy transfer between sub-layers, resulting in a more stable and efficient light emission with lower voltage requirements.
Implementation Method 1
a first light-emitting sub-layer with a hollow structure; and a second light-emitting sub-layer, which includes: a body part; and a projecting part, which projects from the body part and is accommodated in the hollow structure
Data Source
AI summary
The present invention discloses an organic light-emitting diode (OLED) and an electronic device, wherein the OLED includes a first carrier transport layer and a second carrier transport layer that are set opposite to each other, and a light-emitting layer; the light-emitting layer includes a first light-emitting sub-layer with a hollow structure, and a second light-emitting sub-layer which includes a body part and a projecting part, wherein the projecting part projects from the body part and is accommodated in the hollow structure; wherein a surface of the first light-emitting sub-layer and a surface of the projecting part form the first surface of the light-emitting layer, and a surface of the body part forms the second surface of the light-emitting layer. By the present invention, the working voltage is lowered, the power consumption is reduced, and in addition, the manufacturing process is simplified due to the reduction of the number of layers.