Indenotriphenylene Amine Derivative for Organic EL Devices
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Solution Overview
Problem
Conventional materials used in phosphorescent organic electroluminescent (EL) devices for full-colored flat panel displays are unsatisfactory in terms of driving voltage, current efficiency, and half-life time, making them inadequate for industrial practice.
Innovation Solution
An indenotriphenylene-based amine derivative is used as a dopant material, hole transporting material, or electron blocking material in organic EL devices, which reduces operating voltage and enhances current efficiency and half-life time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in phosphorescent organic EL devices, then the device structure is established, but the driving voltage is high, current efficiency is low, and half-life time is short
Solution Approach 1:
The patent changes the chemical structure parameters of the organic compound by introducing specific substituents (formula 2) at positions 2 and 7 of the indenotriphenylene core, which modifies the HOMO and LUMO energy levels. This parameter change in molecular structure leads to improved electron transport and reduced operating voltage, thereby increasing current efficiency and extending device half-life time
Solution Approach 2:
The patent creates a composite material system by combining the indenotriphenylene-based amine derivative (formula 1) with specific electron transporting materials in the electron transporting layer. This composite approach synergistically improves device performance by combining the high electron mobility of the indenotriphenylene derivative with the complementary properties of co-deposited materials, resulting in enhanced current efficiency and stability
2Power
If conventional materials are used in phosphorescent organic EL devices, then the device structure is established, but the driving voltage is high and power consumption is high
Solution Approach 1:
The patent modifies the energy level parameters of the organic compound through specific molecular design (formula 1 with substituents in formula 2), which optimizes the HOMO-LUMO gap and electron affinity. This parameter optimization enables lower driving voltage operation while maintaining high efficiency, directly reducing power consumption
Solution Approach 2:
The patent replaces conventional electron transporting materials with the indenotriphenylene-based amine derivative that possesses inherently superior electron mobility characteristics. This substitution eliminates the need for high driving voltages required by conventional materials, thereby reducing power consumption without sacrificing device performance
3Productivity
If conventional materials are used in phosphorescent organic EL devices, then the device structure is established, but current efficiency is low
Solution Approach 1:
The patent optimizes the molecular parameters of the organic compound by introducing electron-withdrawing or electron-donating groups (formula 2) at strategic positions on the indenotriphenylene core. This parameter tuning enhances electron mobility and charge transport efficiency, leading to improved current efficiency and simultaneously extended device operational lifetime
Solution Approach 2:
The indenotriphenylene-based amine derivative acts as an intermediary material in the electron transporting layer, facilitating efficient charge transport between the cathode and the emitting layer. This intermediary function improves current efficiency by enhancing electron injection and transport, while also improving device stability and half-life time through better charge balance
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 indenotriphenylene-based amine derivative improves the performance of organic EL devices by lowering power consumption, increasing efficiency, and extending the half-life time of the devices.
Implementation Method 1
the indenotriphenylene-based amine derivative, which can be used as the dopant material, hole transporting material, or electron blocking material of the organic EL device
Implementation Method 2
an electron blocking layer (EBL) between the emitting layer (EML) and the hole transporting layer (HTL)... the indenotriphenylene-based amine derivative, which can be used as the dopant material, hole transporting material, or electron blocking material
Implementation Method 3
An organic EL device is a light-emitting diode (LED) in which the light emitting layer is a film made from organic compounds, which emits light in response to an electric current
Data Source
AI summary
The present invention discloses an indenotriphenylene-based amine derivative and an organic electroluminescence device employing the indenotriphenylene-based amine derivative as the dopant material, the hole transporting material, or the electron blocking material of the organic electroluminescence device. The organic electroluminescence device of the present invention exhibits improved performance, such as reduced power consumption, increased current efficiency, and longer half-life time.