OLED Emitting Layer Structure for Blue Lifetime and Simpler Deposition
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Solution Overview
Problem
In-vehicle organic light emitting diode (OLED) devices face challenges with short electric current efficiency and service life, particularly for blue light, and have complex manufacturing processes due to the need for multiple evaporation chambers in cascaded tandem structures, increasing costs and reducing yield.
Innovation Solution
An organic light emitting diode device with a structure that includes a first common blue-light light-emitting layer, a red-green-blue light emitting layer, and a second common blue-light light-emitting layer, where the red, green, and blue light emitting layers are quantum dot layers with specific host materials and dopants, improving efficiency and service life, and simplifying manufacturing by reducing the number of chambers and mask plates required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cascaded tandem structures are used to improve electric current efficiency and service life, then electric current efficiency and service life are improved, but manufacturing complexity increases due to doubling evaporation chambers
Solution Approach 1:
The light emitting unit is segmented into multiple sub-units stacked in the thickness direction, with each sub-unit containing a light emitting layer, hole transport layer, and electron transport layer. This segmentation allows independent optimization of each layer while maintaining overall device performance and simplifying the manufacturing process by eliminating the need for multiple evaporation chambers.
Solution Approach 2:
Multiple light emitting sub-units are merged into a single integrated structure within one evaporation chamber. The hole transport layer and electron transport layer are combined in a single stack, allowing simultaneous deposition of all layers without requiring separate chambers for each layer, thus reducing manufacturing complexity while maintaining the benefits of tandem structures.
2Use of energy by moving object
If cascaded tandem structures are used to improve electric current efficiency, then electric current efficiency is improved 1.5 to 2 times, but manufacturing cost increases due to multiple evaporation chambers
Solution Approach 1:
All light emitting sub-units and transport layers are combined and deposited within a single evaporation chamber, eliminating the need for multiple chambers. This merging approach maintains the high electric current efficiency of tandem structures while significantly reducing manufacturing cost by avoiding the capital expenditure and operational costs associated with multiple evaporation chambers.
3Duration of action of stationary object
If cascaded tandem structures are used to improve service life, then service life is improved 2 to 4 times, but device complexity increases due to multiple chambers
Solution Approach 1:
The device is segmented into multiple light emitting sub-units stacked in the thickness direction, with each sub-unit containing optimized layers for specific functions. This segmentation allows the service life benefits of tandem structures to be achieved while keeping each individual layer simple and compatible with single-chamber deposition processes.
Solution Approach 2:
Instead of expanding the device horizontally with multiple chambers, the multiple light emitting sub-units are stacked vertically in the thickness direction. This dimensional change allows the tandem structure benefits to be achieved without increasing the horizontal footprint or requiring multiple evaporation chambers, thus reducing device complexity.
4Manufacturing precision
If multiple accurate mask plates are used in cascaded tandem structures, then manufacturing precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
All layers including light emitting layers, hole transport layers, and electron transport layers are deposited simultaneously or sequentially within a single evaporation chamber using a single mask plate. This merging of deposition processes eliminates the need for multiple mask plates and reduces alignment complexity while maintaining manufacturing precision through optimized single-chamber deposition 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 proposed structure enhances electric current efficiency and service life of side-by-side OLED devices while reducing manufacturing complexity and costs by eliminating the need for multiple chambers and accurate mask plates, thereby improving aperture ratio and overall yield.
Implementation Method 1
The red light emitting layer R, the green light emitting layer G, and the blue light emitting layer B are quantum dot light emitting layers
Data Source
AI summary
An organic light emitting diode device and a display panel are provided. The display panel includes the organic light emitting diode device. The organic light emitting diode device includes an emitting material layer. The emitting material layer includes a first common blue-light light-emitting layer, a red-green-blue light emitting layer, and a second common blue-light light-emitting layer.