OLED Charge Generating Layer for Selective Color Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges in achieving efficient color conversion and selective operation of light emitting units based on bias direction, limiting their ability to emit different colors effectively.
Innovation Solution
The OLED design incorporates a charge generating layer with multiple organic layers, including p-type and n-type layers, and hole/electron transport layers, allowing for selective operation of light emitting units based on bias direction and enabling color conversion by varying the wavelength range of emitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light emitting unit is used in OLED, then the device structure is simple, but the color conversion capability is limited
Solution Approach 1:
The light emitting layer is divided into multiple light emitting units (first light emitting unit and second light emitting unit) with different light emitting wavelengths. Each unit is controlled by separate charge generating layers with different types (n-type and p-type), enabling independent operation and color conversion while maintaining a relatively simple overall structure.
2Adaptability or versatility
If multiple light emitting units with different wavelengths are integrated, then color conversion capability is improved, but the device complexity increases
Solution Approach 1:
Multiple light emitting units with different wavelengths are integrated into a single OLED device structure. The first light emitting unit and second light emitting unit are combined with their respective charge generating layers (n-type and p-type) to form a unified device that can emit different colors by controlling the bias direction.
Solution Approach 2:
The OLED device is designed to perform multiple functions: it can emit light at different wavelengths (colors) by applying bias in different directions. The same device structure serves as both a red OLED and a green OLED depending on the bias direction, achieving multi-functionality without requiring separate devices.
3Adaptability or versatility
If n-type and p-type charge generating layers are added for selective operation, then the ability to emit different colors is improved, but the manufacturing complexity increases
Solution Approach 1:
Different regions of the device have different charge generating layer types (n-type and p-type) to provide localized functionality. The first charge generating layer is n-type while the second is p-type, allowing each region to respond to bias in a specific direction and emit the corresponding color, thus achieving selective operation.
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 enables easy color conversion in a single OLED by selectively operating light emitting units, allowing for different colors to be emitted based on the applied bias, enhancing the device's color rendering capabilities.
Implementation Method 1
a charge generating layer on the first light emitting unit, the charge generating layer including a plurality of organic layers... the first organic layer and the second organic layer both being one of a p-type layer or a hole transport layer, and the third organic layer being the other of the p-type layer or the hole transport layer
Implementation Method 2
a first light emitting unit on the first electrode... a second light emitting unit on the charge generating layer... The first light emitting unit may include a first hole controller on the first electrode, a first light emitter on the first hole controller, and a first electron controller on the first light emitter
Data Source
AI summary
An organic light emitting diode, including a first electrode; a first light emitting unit on the first electrode; a charge generating layer on the first light emitting unit, the charge generating layer including a plurality of organic layers; a second light emitting unit on the charge generating layer; and a second electrode on the second light emitting unit, the plurality of organic layers of the charge generating layer including a first organic layer and a second organic layer that are respectively adjacent to the first light emitting unit and the second light emitting unit; and a third organic layer between the first organic layer and the second organic layer, the first organic layer and the second organic layer being one of a p-type layer or a hole transport layer, and the third organic layer being the other of the p-type layer or the hole transport layer.