OLED Layer Structure Using GSP Slope for Lower Driving Voltage
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Solution Overview
Problem
Existing organic light-emitting devices (OLEDs) face challenges in achieving low driving voltage, high emission efficiency, and low power consumption.
Innovation Solution
The structure of the OLEDs is optimized by selecting organic compounds for the layers such that the giant surface potential (GSP) slope is strategically controlled to enhance the application of the electric field to the light-emitting layer, with specific configurations and materials used to achieve desired electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional organic compounds are used in OLED layers, then the device structure is simple, but the driving voltage is high and emission efficiency is low
Solution Approach 1:
The patent applies local quality by assigning different GSP slope characteristics to different layers within the OLED structure. Specifically, the light-emitting layer is designed with a higher GSP slope than the adjacent carrier-transport layers, creating a localized property distribution that optimizes electric field concentration where needed (in the light-emitting layer) while maintaining simpler characteristics in transport layers.
Solution Approach 2:
The patent utilizes parameter changes by selecting organic compounds based on their GSP slope values. The invention changes the key parameter of GSP slope across different layers, with the light-emitting layer having a higher GSP slope parameter than the carrier-transport layers, thereby controlling electric field distribution and achieving lower driving voltage and higher emission efficiency.
2Productivity
If the GSP slope of carrier-transport layers is increased to improve electric field application, then emission efficiency improves, but the overall device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different GSP slope characteristics to different layers within the OLED structure. Specifically, the light-emitting layer is designed with a higher GSP slope than the adjacent carrier-transport layers, creating a localized property distribution that optimizes electric field concentration where needed (in the light-emitting layer) while maintaining simpler characteristics in transport layers.
Solution Approach 2:
The patent employs composite materials by combining organic compounds with different GSP slope characteristics into a multi-layer structure. The device integrates layers with optimized compound compositions, where each layer uses compounds selected for their specific GSP slope properties, creating a composite structure that achieves high emission efficiency through synergistic material combinations.
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 results in OLEDs with lower driving voltage, higher emission efficiency, and reduced power consumption, making them suitable for various electronic appliances and displays.
Implementation Method 1
Light-emitting devices (organic EL elements) including organic compounds and utilizing electroluminescence (EL) have been put into more practical use. Carriers are injected by application of voltage to the device, and recombination energy of the carriers is used, whereby light emission can be obtained from the light-emitting material.
Data Source
AI summary
A light-emitting device includes a first electrode, a second electrode, a light-emitting layer, a first layer, and a second layer. The first electrode is over a substrate and is between the second electrode and the substrate. The light-emitting layer is between the first electrode and the second electrode. The first layer is between the first electrode and the light-emitting layer. The second layer is between the second electrode and the light-emitting layer. One of the first electrode and the second electrode is an anode and the other is a cathode. A GSP slope (mV/nm) of one of the light-emitting layer and the first layer closer to the cathode is larger than a GSP slope (mV/nm) of the other closer to the anode. A GSP slope (mV/nm) of one of the light-emitting layer and the second layer closer to the anode is larger than a GSP slope (mV/nm) of the other closer to the cathode.