Organic EL Host Compound for Triplet Energy Conversion
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Solution Overview
Problem
Current light-emitting elements face challenges in improving element characteristics and reliability, particularly in achieving high efficiency and low power consumption, due to limitations in the materials used in the EL layer.
Innovation Solution
A novel organic compound with a dibenzobenzofuroquinoxaline or dibenzobenzothienoquinoxaline skeleton is introduced, which can be used in the EL layer to enhance the efficiency and reliability of light-emitting elements by facilitating phosphorescence emission and reducing drive voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic compounds are used in the EL layer, then the light-emitting element can operate, but the emission efficiency and reliability are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of organic compounds used in the EL layer. Specifically, it introduces compounds with dibenzobenzofuroquinoxaline or dibenzobenzothienoquinoxaline skeletons, which have specific structural parameters (condensed ring systems with heteroatoms) that change the electronic properties, energy levels, and photophysical characteristics of the material, thereby improving both reliability and emission efficiency
Solution Approach 2:
The patent employs composite materials by combining the novel organic compound (host material) with phosphorescent dopant materials to create a composite light-emitting layer. This composite structure allows the host material to provide structural stability and the dopant to provide efficient phosphorescence emission, achieving synergistic improvement in both reliability and emission efficiency
2Use of energy by moving object
If the light-emitting element uses existing materials, then it can achieve basic light emission, but power consumption remains high
Solution Approach 1:
The patent converts the typically harmful triplet excited states (which usually result in non-radiative decay and energy loss) into beneficial phosphorescence emission. By using the novel organic compound as a host for phosphorescent dopants, the triplet excitons are efficiently converted into light emission through phosphorescence, transforming what would be energy waste into useful light output, thereby reducing power consumption while maintaining or increasing emission power
Solution Approach 2:
The patent changes the energy level parameters and photophysical parameters of the EL layer materials. The novel organic compound has optimized HOMO-LUMO energy levels, triplet energy levels, and photostability parameters that enable more efficient energy utilization, reducing the voltage and current required for operation while maintaining high emission power
3Productivity
If conventional organic compounds are used, then the EL layer can be fabricated, but element characteristics and efficiency cannot be improved sufficiently
Solution Approach 1:
The patent applies segmentation by dividing the light-emitting layer into distinct functional components: the novel organic compound serves as the host material providing structural framework and energy transfer pathways, while phosphorescent dopants provide the emission function. This segmentation allows each component to be optimized independently for its specific function, achieving high emission efficiency without excessive overall complexity
Solution Approach 2:
The novel organic compound acts as an intermediary between the injected charges and the phosphorescent dopants. It facilitates charge transport, energy transfer, and stabilizes the excited states, enabling efficient phosphorescence emission. This intermediary role simplifies the overall system design compared to using complex phosphorescent materials directly as the primary light-emitting component
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 novel organic compound improves the emission efficiency and reliability of light-emitting elements, enabling high-efficiency and low-power consumption operation by effectively converting triplet excitation energy into light emission.
Implementation Method 1
Light emission from a triplet excited state is referred to as phosphorescence. The novel organic compound improves the emission efficiency and reliability of light-emitting elements, enabling high-efficiency and low-power consumption operation by effectively converting triplet excitation energy into light emission.
Implementation Method 2
In a light-emitting element, voltage application between a pair of electrodes causes, in an EL layer, recombination of electrons and holes injected from the electrodes, which brings a light-emitting substance (organic compound) contained in the EL layer into an excited state. Light is emitted when the light-emitting substance returns to the ground state from the excited state.
Data Source
AI summary
A novel organic compound is provided. That is, a novel organic compound that is effective in improving element characteristics and reliability is provided. The organic compound is represented by General Formula (G1) having a dibenzobenzofuroquinoxaline skeleton or a dibenzobenzothienoquinoxaline skeleton.In General Formula (G1), Q represents O or S, at least one of R1 to R12 represents a first group having a substituted or unsubstituted condensed aromatic ring or condensed heteroaromatic ring having 3 to 30 carbon atoms, and the other or others of R1 to R12 each independently represent any one of hydrogen, a halogeno group, a hydroxy group, an amino group, a nitro group, and a group having 1 to 50 carbon atoms.