Dual Light Emitting Layers for OLED Efficiency
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Solution Overview
Problem
Current organic light emitting devices with multiple light emitting layers face challenges in optimizing luminous efficiency and display performance due to complex layer structures and material limitations, which affect their viewing angle, contrast, and response speed.
Innovation Solution
The organic light emitting device incorporates two light emitting layers with specific structural and material configurations, including electron transport regions, blocking layers, and insulation members, allowing for independent light emission and improved overlap for enhanced luminous efficiency and display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple light emitting layers are disposed to overlap each other, then luminous efficiency is improved, but device complexity increases
Solution Approach 1:
The device is divided into multiple independently controllable light emitting layers, each capable of individual operation. The first light emitting layer and second light emitting layer are separated by electron blocking layers and hole blocking layers, allowing independent electrical control and light emission from each layer, thus improving luminous efficiency without excessive complexity increase.
Solution Approach 2:
Different regions of the device have specialized functions: electron transport regions for electron injection, hole transport regions for hole injection, electron blocking layers to confine electrons, and hole blocking layers to confine holes. This local specialization optimizes carrier transport and recombination in each region, enhancing overall luminous efficiency.
2Reliability
If two light emitting layers are used with independent electron and hole transport regions, then display performance is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple functional layers are combined into a single integrated structure: electron transport regions, hole transport regions, electron blocking layers, hole blocking layers, and light emitting layers are merged into one device architecture. This unified structure improves display performance while streamlining the manufacturing process compared to separate devices.
Solution Approach 2:
The device structure serves multiple functions simultaneously: the electron transport regions and hole transport regions manage carrier injection, the blocking layers confine carriers, and the light emitting layers generate light. This multi-functionality within a single device improves display performance without requiring multiple separate components.
3Loss of energy
If electron blocking layers and hole blocking layers are added between light emitting layers, then luminous efficiency is enhanced, but device complexity increases
Solution Approach 1:
The device is segmented into distinct functional zones by electron blocking layers and hole blocking layers. These blocking layers create clear boundaries between electron-rich and hole-rich regions, improving carrier confinement and recombination efficiency in each light emitting layer, thus enhancing luminous efficiency.
Solution Approach 2:
Specific regions are assigned specialized blocking functions: electron blocking layers with electron blocking capability are positioned to confine electrons, while hole blocking layers with hole blocking capability are positioned to confine holes. This local functional specialization optimizes carrier distribution and improves luminous efficiency.
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 improved luminous efficiency, wider viewing angles, and higher resolution displays by allowing each light emitting layer to be individually driven, thereby extending the device's lifespan and enhancing display quality.
Implementation Method 1
a first light emitting layer disposed below the first electron transport region... a second light emitting layer including a first area, a second area adjacent to the first area, and a third area adjacent to the second area
Data Source
AI summary
Provided is an organic light emitting device. The organic light emitting device may include two light emitting layers. One of the two light emitting layers may emit light in a horizontal driving mode, and the other of the two light emitting layers may emit light in a vertical driving mode.