Top-Emission OLED Optical Resonance Thickness Adjustment
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Solution Overview
Problem
Top-emission organic light emitting devices face complexity in pixel design due to the need for varying organic film thicknesses based on emission wavelength, leading to increased manufacturing time and potential spectrum distortions when using auxiliary layers or altering common functional layers.
Innovation Solution
An organic light emitting diode structure featuring a mixed emission layer with a host and dopant material, and additional layers with only the host material, allowing for adjustable optical resonance thickness without auxiliary layers, along with a method of deposition using overlapping regions for precise layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of the organic film is adjusted according to emission wavelength using auxiliary layers, then the optical resonance thickness can be optimized for different colors, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent extracts the thickness adjustment function from separate auxiliary layers and integrates it into the emission layer itself. By controlling the thickness of the emission layer directly (e.g., 20-30nm for blue, 30-40nm for green, 40-50nm for red), the patent eliminates the need for additional auxiliary layers while maintaining optimal optical resonance for different emission colors.
Solution Approach 2:
The emission layer is designed to serve multiple functions simultaneously: it provides the primary light emission function and also serves as the thickness adjustment layer for optical resonance optimization. This multi-functionality eliminates the need for separate auxiliary layers, simplifying the overall device structure and manufacturing process.
2Device complexity
If the thickness of the emission layer is increased to adjust optical resonance, then the manufacturing process is simplified, but the distance between emission region and reflective film is reduced causing spectrum distortion
Solution Approach 1:
The patent optimizes the emission layer thickness within specific parameter ranges (20-30nm for blue, 30-40nm for green, 40-50nm for red) to achieve the right balance between optical resonance enhancement and maintaining adequate distance from the reflective anode. This prevents spectrum distortion while still simplifying the device structure compared to using thick auxiliary layers.
3Device complexity
If the thickness of common functional layers (hole injection transport layer or electron injection transport layer) is changed to adjust optical resonance, then auxiliary layers are eliminated, but characteristics of other colors are affected
Solution Approach 1:
The patent applies local quality by making only the emission layer thickness variable according to the specific emission color requirements, while keeping the thickness of common functional layers (hole injection transport layer and electron injection transport layer) constant. This localized adjustment ensures that color characteristics remain stable while still achieving optimal optical resonance for each pixel type.
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 approach enables adjustable optical resonance thickness, prevents spectrum distortions, and maintains high luminescent efficiency and color coordinate accuracy, reducing manufacturing complexity and time.
Implementation Method 1
an organic emission layer interposed between the first electrode and the second electrode, the organic emission layer including: a first emission layer including a mixed layer that contains a host material and a dopant material
Implementation Method 2
a first electrode that is optically reflective
Implementation Method 3
a method of deposition using overlapping regions for precise layer formation
Data Source
AI summary
Provided are an organic light emitting diode and a method of manufacturing the same. The organic light emitting diode adjusts an optical resonance thickness and prevents spectrum distortions without use of an auxiliary layer. The organic light emitting diode includes a first electrode that is optically reflective; a second electrode that is optically transmissible and faces the first electrode; an organic emission layer interposed between the first electrode and the second electrode, the organic emission layer including: a first emission layer including a mixed layer that contains a host material and a dopant material, and a second emission layer comprising only the host material; and a carrier injection transport layer interposed between the organic emission layer and the first electrode or between the organic emission layer and the second electrode.