Organic Electroluminescence Compound for Low Drive Voltage
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Solution Overview
Problem
Existing organic electroluminescence devices face challenges in achieving lower drive voltage and higher luminous efficiency for applications in illumination and display units.
Innovation Solution
A compound represented by a specific formula is used in the organic electroluminescence device, which includes various substituents and linking groups to enhance the performance of the electron transporting zone, specifically in the electron injecting and transporting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional organic EL devices are used, then they can be manufactured with organic materials, but they exhibit higher drive voltage and lower luminous efficiency compared to inorganic LEDs
Solution Approach 1:
The patent applies parameter changes by systematically modifying the molecular structure of electron transporting materials through varying substituents (R1-R6), heterocyclic rings (Az), and linking groups (L1, L2) to optimize electron mobility and energy levels, thereby reducing drive voltage and improving luminous efficiency
Solution Approach 2:
The patent employs composite materials by combining electron transporting compounds with host materials for the emitting layer, creating multi-component systems where each material contributes specific properties to achieve lower drive voltage and higher luminous efficiency
2Use of energy by moving object
If nitrogen-containing heterocyclic rings are used in electron transporting materials, then drive voltage is reduced, but further improvement in performance is still demanded for illumination and display applications
Solution Approach 1:
The patent applies local quality by introducing specific functional groups (Az heterocyclic rings with nitrogen atoms) at strategic positions in the molecular structure, where these localized nitrogen-containing regions provide electron-transporting pathways that reduce drive voltage while maintaining overall molecular stability
Solution Approach 2:
The patent uses copying by establishing a proven molecular framework (formula 1 structure with Az, L1, L2, and R groups) that has been validated to reduce drive voltage, and systematically replicating and varying this framework to achieve both low drive voltage and high performance stability for illumination and display applications
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 compound improves the performance of organic electroluminescence devices by reducing drive voltage and increasing luminous efficiency, making them more suitable for illumination and display applications.
Implementation Method 1
a compound which serves as an electron transporting material or a host material for an emitting layer in an organic electroluminescence device
Implementation Method 2
When an electric field is applied on both electrodes, electrons are injected from the cathode while holes are injected from the anode. Further, the electrons are recombined with the holes in the emitting layer to generate an excited state. When the excited state is returned to a ground state, energy is emitted as light.
Data Source
Figure 1
AI summary
A compound of the invention is represented by a formula (1) below. In the formula (1), Cz is represented by a formula (1a) below and Az is represented by a formula (11) below.