Transport Layer Materials for Low-Voltage Organic Light Emission
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Solution Overview
Problem
Existing light-emitting devices face challenges with high driving voltage and power consumption, which affect their efficiency and practical application in various electronic devices.
Innovation Solution
The use of specific hole transport and electron transport layer materials with high GSP_slope (≥20 mV/nm) and low refractive index, combined with appropriate aromatic hydrocarbon rings and alkyl groups, to enhance carrier injection and reduce driving voltage and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional light-emitting device structures are used, then device functionality is achieved, but driving voltage remains high and power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of transport layer materials through specific substituents (chain alkyl groups with 2-5 carbon atoms and cycloalkyl groups with 6-12 carbon atoms) to achieve optimal GSP_slope values (≥20 mV/nm) and refractive indices, thereby reducing driving voltage and power consumption while maintaining device reliability
Solution Approach 2:
The patent uses composite materials by combining specific aromatic hydrocarbon ring structures with alkyl and cycloalkyl substituents to create transport layer materials with optimized properties, including high GSP_slope and appropriate refractive index, which resolve the contradiction between low power consumption and stable driving voltage
2Power
If transport layer materials with high GSP_slope are used, then carrier injection is enhanced and driving voltage is reduced, but material structure complexity increases
Solution Approach 1:
The patent applies local quality by introducing specific functional groups (chain alkyl groups with 2-5 carbon atoms and cycloalkyl groups with 6-12 carbon atoms) at specific positions on the aromatic hydrocarbon ring structure, creating localized structural features that achieve high GSP_slope values while maintaining overall molecular symmetry and simplicity
Solution Approach 2:
The patent uses parameter changes by optimizing the number and position of alkyl and cycloalkyl substituents to achieve the target GSP_slope range (≥20 mV/nm) and refractive index, balancing material structure complexity with electrical performance requirements
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 proposed materials result in light-emitting devices with lower driving voltage and power consumption, improving efficiency and reducing operational costs.
Implementation Method 1
The GSP_slope (mV/nm) that is a potential gradient of a surface potential of an evaporated film of the material is higher than or equal to 20 (mV/nm)
Implementation Method 2
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
An organic semiconductor device with low driving voltage is provided. The light-emitting device includes an anode, a cathode, and an EL layer between the anode and the cathode. The EL layer includes a hole-transport layer and a light-emitting layer. The hole-transport layer is positioned between the anode and the light-emitting layer. The hole-transport layer is not in contact with the anode. The hole-transport layer includes a transport layer material for a light-emitting device and the GSP_slope that is a potential gradient of a surface potential of an evaporated film of the material is higher than or equal to 20 (mV/nm).