Phenanthrene ETU Host for Blue OLED Voltage Reduction
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Solution Overview
Problem
Conventional organic electroluminescent devices, particularly blue devices, operate at higher voltages compared to red and green devices, limiting power efficiency, and there is a need to reduce the operating voltage of blue organic electroluminescent devices while maintaining electron mobility and stability.
Innovation Solution
A compound with a phenanthrene fused with an Electron Transfer Unit (ETU) is used as a blue host, enhancing electron mobility and stability, thereby reducing the operating voltage of blue organic electroluminescent devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electron mobility is increased to reduce operating voltage, then power efficiency is improved, but lifespan of the blue layer decreases due to increased electron attack on adjacent layers
Solution Approach 1:
The patent changes the chemical structure parameters of the host compound by introducing phenanthrene fused with ETU, which modifies electron mobility and electron stability parameters. This structural modification allows achieving lower operating voltage while maintaining blue layer lifespan through optimized electron behavior.
Solution Approach 2:
The patent uses a composite molecular structure combining phenanthrene and ETU (electron transfer unit) in formula 1. This composite structure leverages the beneficial properties of both components: phenanthrene provides strong resonance for electron stabilization, while ETU contributes to electron mobility, achieving a balance between power efficiency and reliability.
2Device complexity
If conventional host materials are used in blue devices, then device structure is simpler, but operating voltage is 0.5 V to 1 V higher than red and green devices
Solution Approach 1:
The patent changes the chemical structure parameters of the host compound by introducing phenanthrene fused with ETU, which modifies electron mobility and electron stability parameters. This structural modification allows achieving lower operating voltage while maintaining blue layer lifespan through optimized electron behavior.
Solution Approach 2:
The patent uses a composite molecular structure combining phenanthrene and ETU (electron transfer unit) in formula 1. This composite structure leverages the beneficial properties of both components: phenanthrene provides strong resonance for electron stabilization, while ETU contributes to electron mobility, achieving a balance between power efficiency and reliability.
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 results in an organic electroluminescent device with a lower operating voltage, achieving higher power efficiency and balancing voltage levels across different color devices.
Implementation Method 1
a phenanthrene has a stronger resonance compared to a benzene or a naphthalene, so that the electrons can be more stabilized in a phenanthrene
Implementation Method 2
a compound represented by the following formula 1 may have better electron mobility and good electron stability by increasing the resonance of ETU
Data Source
AI summary
The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound of the present disclosure, it is possible to provide an organic electroluminescent device having an operating voltage lower than that of a conventional organic electroluminescent device and thus achieving higher power efficiency.