Biscarbazole Host Material for Organic EL Driving Voltage
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Solution Overview
Problem
Current organic electroluminescence (EL) devices face challenges in improving device performance, particularly in achieving low driving voltage, enhanced luminous efficiency, and prolonged luminous life, which are not adequately addressed by existing materials.
Innovation Solution
A novel compound with a specific biscarbazole structure is introduced, which serves as a host material in the emitting layer, improving hole-transporting properties and carrier balance, thereby reducing driving voltage and increasing luminous efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If existing emitting materials are used in organic EL devices, then device structure can be maintained, but driving voltage remains high and luminous efficiency is insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the emitting materials by introducing specific biscarbazole core structures with controlled substituents (m=1-3, n=1-4), which fundamentally alters the electrical and optical properties of the material, enabling lower driving voltage and higher luminous efficiency simultaneously
Solution Approach 2:
The patent creates composite material systems by combining the novel biscarbazole compound with other organic materials in the emitting layer, achieving synergistic effects that improve both carrier transport and light emission properties, resolving the contradiction between power consumption and efficiency
2Duration of action of stationary object
If conventional emitting materials are used, then material selection is simple, but carrier balance and luminous life are insufficient
Solution Approach 1:
The patent introduces local quality variations by adding specific substituent groups at different positions (m=1-3, n=1-4) on the biscarbazole core structure, creating regions with different electron-donating or electron-withdrawing properties that locally optimize carrier balance and extend luminous life
Solution Approach 2:
The patent systematically varies structural parameters (m and n values) to tune the HOMO-LUMO energy levels and carrier mobility, achieving optimal carrier balance that directly improves luminous life 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 organic EL devices with lower driving voltage, improved carrier balance, and extended luminous life, enhancing overall device performance.
Implementation Method 1
improving hole-transporting properties and carrier balance, thereby reducing driving voltage
Implementation Method 2
When a voltage is applied between the electrodes, electrons and holes are injected from the cathode and the anode, respectively, to an emission region. The electrons and the holes injected are recombined in the emitting region to form an exited state, and light is emitted when the excited state is returned to the ground state.
Data Source
AI summary
A compound represented by the following formula (1): wherein in the formula, L1 is a single bond or a linking group, A is a group represented by the following formula (A), B is a group represented by the following formula (B), m is an integer of 1 to 3, and n is an integer of 1 to 4.