White OLED Organic Layer Thickness Control for Simplified Full Color Displays
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Solution Overview
Problem
Current white organic electroluminescent element technologies face complexity issues due to the need for multiple dopants in the light emitting layer and incomplete energy transfer between host and dopant, limiting their applicability in full color technology.
Innovation Solution
A white organic electroluminescent element with a blue light emitting layer, comprising specific layers such as an anode, cathode, capping layer, electron injection layer, hole injection layer, and organic layer, where the organic layer's thickness is adjusted to (X+120N) nm, allowing for efficient white light emission and increased work window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple dopants are doped into the light emitting layer to achieve white light emission, then the white light emission is enabled, but the element complexity increases
Solution Approach 1:
The patent extracts and removes the complex multi-dopant system from the light emitting layer, replacing it with a simplified single-dopant configuration combined with specific thickness control of the organic layer to achieve white light emission
Solution Approach 2:
The patent changes the critical parameter from chemical composition complexity (multiple dopants) to physical dimension control (organic layer thickness of X+120N nm), thereby simplifying the element while maintaining white light emission capability
2Illumination intensity
If multiple dopants are used in the light emitting layer to achieve white light emission, then the white light is formed, but the manufacturing process becomes more complex
Solution Approach 1:
The patent removes the requirement for multiple dopant materials and their associated deposition processes, extracting only the essential thickness control parameter for the organic layer, thereby simplifying manufacturing
Solution Approach 2:
The patent shifts the manufacturing control parameter from multiple dopant concentrations and ratios to a single organic layer thickness parameter (X+120N nm), making the manufacturing process easier and more controllable
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 simplifies the full color technology process by enabling white light emission with a broader work window, reducing complexity and enhancing energy transfer, thereby improving the performance of white organic electroluminescent elements.
Implementation Method 1
white organic electroluminescent element comprises an anode, a cathode, a capping layer, and an organic layer. The organic layer comprises a blue light emitting layer
Implementation Method 2
The thickness of the organic layer is X+120N nm, wherein 85≦X≦125, and N=0, 1, or 2
Data Source
AI summary
A white organic electroluminescent element for an organic electroluminescent display and a display using the white organic electroluminescent are provided. The organic electroluminescent display comprises a white organic electroluminescent element and a color filter. The white organic electroluminescent element comprises an anode, a cathode, a capping layer, and an organic layer. The capping layer is disposed on the cathode. The organic layer is disposed between the anode and the cathode, and comprises a blue light emitting layer. The thickness of the organic layer is X+120N nm, wherein 85≦X≦125, and N=0, 1, or 2. The white organic electroluminescent element is configured to emit a white light. The color filter is configured to convert the white light to a first color beam, with the first color beam being either red, blue, or green.