High Molecular Compound for Blue Light Emission
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Solution Overview
Problem
Current light-emitting devices with phosphorescent compounds face challenges in achieving stable blue light emission due to high triplet excitation energy requirements, leading to increased driving voltage and power consumption, while devices with fluorescent compounds have lower emission efficiency.
Innovation Solution
A high molecular compound with a fluorenediyl group, hole-transport skeleton, and electron-transport skeleton is developed, featuring a structure where intramolecular charge transfer occurs, reducing the difference between singlet and triplet excitation energy levels, and incorporating a guest material for efficient energy transfer and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphorescent compounds are used to achieve high emission efficiency, then emission efficiency is improved, but driving voltage increases due to high triplet excitation energy requirements
Solution Approach 1:
The patent changes the energy level parameters of the host material by selecting materials with small differences between singlet and triplet excitation energy levels. This parameter change enables efficient triplet exciton conversion while maintaining lower driving voltages, resolving the contradiction between emission efficiency and power consumption
Solution Approach 2:
The host material acts as an intermediary between the phosphorescent compound and the electrodes. By carefully selecting host materials with appropriate energy levels, the patent mediates the energy transfer process to achieve high emission efficiency without requiring excessive driving voltage
2Productivity
If phosphorescent compounds are used for blue light emission, then emission efficiency is improved, but compound stability deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the phosphorescent compounds to develop stable blue-emitting materials. By modifying molecular structures and selecting appropriate host-guest combinations, the patent achieves both high emission efficiency and compound stability for blue light emission
3Reliability
If fluorescent compounds are used instead of phosphorescent compounds, then compound stability is improved, but emission efficiency deteriorates
Solution Approach 1:
The patent changes the energy level parameters and molecular structures of fluorescent compounds to enhance their emission efficiency. By optimizing the host-guest energy level matching and selecting appropriate fluorescent materials, the patent achieves high emission efficiency while maintaining compound stability
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 high molecular compound enhances emission efficiency, reduces driving voltage, and achieves low power consumption in light-emitting devices, particularly for blue light emission by efficiently converting triplet excitons to singlet excitons.
Implementation Method 1
a singlet excited state is generated from a triplet excited state by reverse intersystem crossing
Implementation Method 2
a thermally activated delayed fluorescent (TADF) substance is known in addition to a phosphorescent compound
Implementation Method 3
singlet excitation energy of the thermally activated delayed fluorescent substance is transferred to the fluorescent compound and light emission is obtained from the fluorescent compound
Implementation Method 4
light-emitting devices utilizing electroluminescence (EL) have been actively researched and developed
Data Source
AI summary
A novel high molecular compound is provided. The high molecular compound includes a repeating unit. The repeating unit has a fluorenediyl group, a hole-transport skeleton, and an electron-transport skeleton. The hole-transport skeleton is bonded to the fluorenediyl group through a substituted or unsubstituted first arylene group. The electron-transport skeleton is bonded to the fluorenediyl group through a substituted or unsubstituted second arylene group. In an excited state, intramolecular charge transfer occurs between the hole-transport skeleton and the electron-transport skeleton.