Organic Semiconductor Layer Electron Mobility
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Solution Overview
Problem
There is a need for organic semiconductor materials and layers with improved electron mobility, electrochemical stability, and reduced operating voltage to enhance the performance and efficiency of organic light-emitting diodes (OLEDs) for large-size flat panel displays and mobile devices, aiming for higher efficiency and longer lifetime while reducing power consumption.
Innovation Solution
The development of an organic semiconductor layer comprising a specific compound with a formula that includes arylene or heteroarylene groups, which enhances electron transport characteristics, stability, and conductivity, allowing for lower operating voltages and increased luminance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic semiconductor materials are used, then the device structure is simple, but electron mobility is insufficient and electrochemical stability is poor
Solution Approach 1:
The patent employs composite molecular structures combining arylene/heteroarylene core units with dialkyl phosphine oxide substituents. This composite approach integrates electron-transporting aromatic cores with electrochemically stable phosphine oxide groups, achieving both high electron mobility and excellent electrochemical stability simultaneously
Solution Approach 2:
The patent systematically varies molecular parameters including the type of aromatic core (arylene vs heteroarylene), the number and position of phosphine oxide groups, and alkyl chain lengths. These parameter changes optimize the balance between electron mobility, electrochemical stability, and device performance
2Use of energy by moving object
If conventional organic semiconductor materials are used, then manufacturing is easier, but operating voltage is high leading to high power consumption
Solution Approach 1:
The patent modifies molecular parameters to achieve low operating voltages (reducing power consumption) while maintaining manufacturability. The dialkyl phosphine oxide groups and aromatic cores are designed to provide appropriate HOMO/LUMO energy levels that enable low-voltage operation without requiring overly complex synthesis procedures
3Productivity
If electron mobility is increased through material optimization, then luminance efficiency improves, but device complexity increases
Solution Approach 1:
The patent uses composite molecular designs where arylene/heteroarylene cores provide high electron mobility for improved luminance efficiency, while the integrated phosphine oxide groups maintain structural organization. This composite approach achieves high productivity without proportionally increasing device complexity
Solution Approach 2:
The phosphine oxide-containing aromatic compounds serve multiple functions simultaneously: they act as electron transport materials, provide electrochemical stability, enable low-voltage operation, and maintain good film-forming properties. This multi-functionality improves luminance efficiency without requiring additional separate components that would increase device complexity
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 use of this compound in the organic semiconductor layer results in improved electron mobility, stability, and reduced operating voltage, leading to higher efficiency and longer lifespan of OLEDs, as well as reduced power consumption in mobile devices.
Implementation Method 1
electrons injected from the cathode move to the EML, via the ETL
Implementation Method 2
the compound of formula 1 or 4, and an organic semiconductor layer as well as organic electronic device comprising the compound of formula 1 have strong electron transport characteristics to increase charge mobility
Implementation Method 3
development for an organic material being capable of increasing electron mobility and simultaneously increasing electrochemical stability is needed
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
The present invention relates to a compound of formula 1 and an organic electronic device comprising an organic semiconductor layer, wherein at least one organic semiconductor layer comprises a compound of formula 1: wherein L1 has the formula 2: and L2 has the formula 3: wherein L1 and L2 are bonded at "∗" via a single bond independently to the same or different arylene groups or heteroarylenes group of Ar1; and wherein X1, X2 are independently selected from O, S and Se; Ar1 is selected from substituted or unsubstituted C20 to C52 arylene or C14 to C64 heteroarylene, wherein the substituent of the substituted C20 to C52 arylene or C14 to C64 heteroarylene are independently selected from C1 to C12 alkyl, C1 to C12 alkoxy, CN, halogen, OH, C6 to C25 aryl and C2 to C21 heteroaryl; R1, R2 are independently selected from substituted or unsubstituted C1 to C16 alkyl, wherein the substituent of substituted C1 to C16 alkyl is selected from C6 to C18 arylene or C2 to C12 heteroarylene; R3, R4 are independently selected from substituted or unsubstituted C1 to C16 alkyl, substituted or unsubstituted C6 to C18 arylene, C2 to C20 heteroarylene, wherein the substituent of substituted C1 to C16 alkyl, the substituent of the substituted C6 to C18 arylene, C2 to C20 heteroarylene are independently selected from C6 to C18 arylene or C2 to C12 heteroarylene; n is selected from 1 to 5, wherein n is an integer number.