Organic Electroluminescence Compound Formula for Low Driving Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescence devices require compounds that enhance electron or hole transport and recombination efficiency to improve performance, but existing materials do not adequately address these needs.
Innovation Solution
A compound represented by a specific formula is used in the organic electroluminescence device, which includes a phenyl or naphthyl group as Ar1, an aryl group as Ar2, and specific substituents, facilitating efficient electron transport and recombination, thereby reducing the driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compounds are used in organic EL devices, then the device structure is simple, but the driving voltage is high and performance is insufficient
Solution Approach 1:
The patent applies parameter changes by systematically modifying the molecular structure of compound (1) through varying substituents R1 to R4, aryl groups Ar1 and Ar2, and heterocyclic groups. These structural parameter changes optimize electron transport and recombination properties, resulting in reduced driving voltage and improved device performance while maintaining the core dibenzofuran or dibenzothiophene skeleton
Solution Approach 2:
The patent employs composite materials by combining compound (1) with other organic materials in the device layers. The compound is used in conjunction with hole injection layers, electron transport layers, and light-emitting materials to create a composite organic EL device structure that achieves synergistic performance improvement and lower operating voltage
2Productivity
If compound structure is optimized for electron transport, then recombination efficiency improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the compound structure into distinct functional segments: the core dibenzofuran/dibenzothiophene unit for electron transport, aryl substituents (Ar1, Ar2) for structural stability, and heterocyclic groups (R1 to R4) for recombination enhancement. This modular segmentation allows independent optimization of each segment's function while maintaining overall molecular integrity
Solution Approach 2:
The patent implements local quality by assigning specific functional properties to different parts of the molecule: the dibenzofuran/dibenzothiophene core provides electron transport capability, while specific substituent positions (R1-R4) are optimized for recombination efficiency. This localized functional distribution enhances overall performance without requiring complete structural redesign
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 allows for organic electroluminescence devices to operate at a lower driving voltage, improving their overall performance by enhancing electron transport and recombination efficiency.
Implementation Method 1
When a voltage is applied between the electrodes, electrons are injected from the cathode and holes are injected from the anode into a light emitting region. The injected electrons recombine with the injected holes in the light emitting region to form excited states. When the excited states return to the ground state, the energy is released as light.
Data Source
AI summary
The compounds represented by formula (1):wherein Ar1, Ar2, m, n, L, R, are R1 to R4 are as defined in the description, provides organic electroluminescence devices having device performance further improved.