Double-Sided OLED With Charge Generation Layer
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Solution Overview
Problem
Current organic electroluminescent devices face challenges with high driving current, low luminous efficiency, and short lifetime, and are limited to single-sided light emission, which complicates their configuration and increases cost.
Innovation Solution
A double-sided light emitting organic electroluminescent device is designed with a light-transmissive substrate, an anode, and a light-transmissive cathode, featuring at least two organic electroluminescent structures and a charge generation layer sandwiched between them, comprising an N-type and P-type semiconductor layer, allowing omnidirectional illumination and reducing driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double-layer structure design is used to achieve double-sided light emitting, then the illumination capability is improved, but the device complexity and cost are increased
Solution Approach 1:
The patent merges two OLED structures into a single integrated device by sharing the substrate, anode, and cathode between two light-emitting structures. The two OLEDs are arranged in series with a common electrode configuration, allowing double-sided emission while reducing the total number of components and simplifying the overall device structure.
Solution Approach 2:
The substrate, anode, and cathode serve dual functions by supporting two different light-emitting structures simultaneously. These common electrodes and substrate act as both the structural foundation and electrical contacts for both OLEDs, enabling multi-functionality and reducing the need for separate components for each emission side.
2Adaptability or versatility
If a double-layer structure design is used to achieve double-sided light emitting, then the illumination capability is improved, but the device thickness and weight are increased
Solution Approach 1:
The patent combines two OLED structures into a single lightweight device by sharing common substrates and electrodes. This merging approach eliminates the need for separate substrates and electrode sets for each emission side, significantly reducing the overall weight while maintaining double-sided emission capability.
Solution Approach 2:
The two light-emitting structures are nested within a single device framework, with one OLED structure positioned on each side of the common substrate. The inner layers share the common electrodes and substrate, creating a compact nested configuration that minimizes weight while enabling dual-sided emission.
3Illumination intensity
If heavy driving current is used, then the brightness is improved, but the luminous efficiency and lifetime are reduced
Solution Approach 1:
The patent segments the current path into two separate series-connected OLED structures, allowing the total voltage to be distributed across both devices. This segmentation enables each OLED to operate at lower current densities while maintaining high overall brightness, thereby improving luminous efficiency and extending device lifetime.
Solution Approach 2:
The patent employs dynamic voltage distribution across the two series-connected OLEDs, where the voltage and current are automatically balanced based on the individual characteristics of each OLED. This dynamic operation allows optimal efficiency at each operating point while maintaining high brightness output.
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 device achieves high brightness, high luminous efficiency, and extended lifetime with small driving current, while simplifying the manufacturing process and reducing production costs, enabling 360° illumination and broader application.
Implementation Method 1
The organic light emission diode (OLED for short) has the properties of high brightness, wide range of material selection, low drive voltage, solid state active light-emission
Implementation Method 2
the charge generation layer includes an N-type semiconductor layer and a P-type semiconductor layer combined with the N-type semiconductor
Data Source
AI summary
Disclosed are a double-sided luminescent organic light emitting device and the manufacturing method thereof. The double-sided luminescent organic light emitting device comprises a transparent substrate (21), an anode (22), a transparent cathode (25), and at least two organic light emitting structures (23a, 23b) and at least a charge-generation layer (24) set between the anode (22) and the transparent cathode (25), and the charge-generation layer (24) is set between the two neighboring organic light emitting structures (23a, 23b), the charge-generation layer (24) and the organic light emitting structures (23a, 23b) are alternately arranged. The charge-generation layer (24) includes an n-type semiconductor layer (241) and a p-type semiconductor (242) layer combined with the n-type semiconductor layer. Said double-sided light emitting organic light emitting device requires low driving current, and has high luminescence efficiency, high brightness, and high light extraction efficiency. In addition, said device enables nearly 360 degrees omnidirectional illumination, enlarges the illumination area and the application range, and has long lifetime, simple preparation procedures and low production cost.