Organic Compound for OLED Driving Voltage and Efficiency
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Solution Overview
Problem
Existing organic electroluminescence (OLED) devices face challenges in reducing driving voltage, enhancing current efficiency, and extending half-life, which are crucial for improved performance and longevity in applications like flat panel displays and illumination.
Innovation Solution
An organic compound with a specific formula is introduced, which can be used as a dopant, host, or electron transporting layer in OLED devices, comprising a divalent bridge and aromatic hydrocarbon groups, optimizing the device's structure to lower driving voltage and increase current efficiency and half-life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic compounds are used in OLED devices, then the device structure is simple and ease of manufacture is maintained, but driving voltage remains high, current efficiency is limited, and half-life is short
Solution Approach 1:
The patent applies parameter changes by systematically modifying the molecular structure of organic compounds - specifically changing the divalent bridge type (O, S, Se, NR3, SiR4R5), aromatic hydrocarbon groups (naphthalene, anthracene, phenanthrene, pyrene), and substituent groups (alkyl, aryl, heteroaryl). These structural parameter variations optimize electron transport properties, reduce driving voltage, and extend device half-life while maintaining reasonable manufacturability
Solution Approach 2:
The patent employs composite material design by combining multiple functional groups within single organic compounds - integrating divalent bridges with aromatic hydrocarbon cores and various substituents. This creates compounds with synergistic properties that simultaneously improve electron mobility, reduce voltage requirements, and enhance device stability and longevity
2Productivity
If conventional organic compounds are used in OLED devices, then manufacturing simplicity is maintained, but current efficiency remains suboptimal
Solution Approach 1:
The patent improves current efficiency through parameter changes in molecular structure - optimizing the divalent bridge selection (O, S, Se, NR3, SiR4R5) for electron transport, selecting appropriate aromatic hydrocarbon groups (naphthalene, anthracene, phenanthrene, pyrene) for stability, and adding substituents (alkyl, aryl, heteroaryl) to fine-tune electronic properties. These changes enhance charge carrier mobility and recombination efficiency, directly improving current efficiency
3Use of energy by moving object
If conventional organic compounds are used in OLED devices, then device simplicity is maintained, but driving voltage remains high
Solution Approach 1:
The patent reduces driving voltage through parameter changes in the organic compound structure - selecting divalent bridges (O, S, Se, NR3, SiR4R5) that facilitate electron transport, incorporating aromatic hydrocarbon groups (naphthalene, anthracene, phenanthrene, pyrene) that provide stable electron pathways, and adding substituents (alkyl, aryl, heteroaryl) that optimize energy levels. These structural modifications lower the energy barrier for electron injection and transport, reducing required driving voltage
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 organic compound significantly reduces driving voltage, enhances current efficiency, and extends the half-life of OLED devices, leading to improved performance and longevity compared to prior art materials.
Implementation Method 1
one or more organic layers formed between the anode and the cathode. At least one of the organic layers comprises the organic compound of formula (1)
Implementation Method 2
Organic electroluminescence (organic EL) devices, i.e., organic light-emitting diodes (OLEDs) that make use of organic compounds, are becoming increasingly desirable than before. The devices make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
An organic compound is described. An organic electroluminescence device comprises the organic compound, as a host of an emissive layer, as a dopant of an emissive layer, or as an electron transporting layer. The organic compound of the following formula may lower a driving voltage or increase a current efficiency or a half-life of the organic electroluminescence device.The same definition as described in the present invention.