Red OLED Host Material for Heat-Resistant Phosphorescent Emission
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in achieving high heat resistance, efficient emission of red or near-infrared light, and long device lifetime, particularly when using phosphorescent compounds as light-emitting substances.
Innovation Solution
Development of an organic compound with a fused aromatic ring fused to a furoquinoxaline or thienoquinoxaline skeleton, which serves as a host material or electron-transport material, enhancing heat resistance and emission efficiency, and allowing for red or near-infrared light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a phosphorescent compound is used as a light-emitting substance, then light emission efficiency is improved, but heat resistance deteriorates
Solution Approach 1:
The patent introduces a host material as an intermediary substance that disperses the phosphorescent compound. This host material has higher triplet excitation energy than the phosphorescent compound, allowing it to act as an energy sink and protect the phosphorescent compound from thermal degradation while maintaining efficient light emission through the phosphorescent mechanism.
Solution Approach 2:
The patent creates a composite light-emitting layer by combining the phosphorescent compound with a specifically designed host material. This composite structure leverages the high emission efficiency of the phosphorescent compound while the host material provides thermal stability and heat resistance, resolving the contradiction between efficiency and heat resistance.
2Productivity
If a phosphorescent compound is dispersed in a host material matrix, then concentration quenching is inhibited, but device lifetime is reduced
Solution Approach 1:
The patent optimizes the concentration of the phosphorescent compound in the host material matrix, maintaining it within a specific range (0.1-10 wt%, preferably 0.1-5 wt%). This parameter optimization prevents concentration quenching while avoiding excessive thermal accumulation that would reduce device lifetime, thereby balancing emission efficiency with device durability.
3Productivity
If high triplet excitation energy is used for the host material, then light emission efficiency is improved, but driving voltage increases
Solution Approach 1:
The patent carefully selects and optimizes the triplet excitation energy parameter of the host material. By tuning this parameter to match the phosphorescent compound's energy levels, the system achieves efficient energy transfer and high emission efficiency while avoiding excessive driving voltage that would result from mismatched energy parameters.
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 organic compound provides high heat resistance, low driving voltage, and extended device lifetime with improved emission efficiency for red or near-infrared light emission, suitable for various applications including display and lighting devices.
Implementation Method 1
By application of voltage to the organic EL device, light emitted from the light-emitting organic compound can be obtained
Implementation Method 2
a compound capable of converting a triplet excited state into light emission (also referred to as a phosphorescent compound or a phosphorescent material)
Data Source
AI summary
An organic compound with high heat resistance is provided. A novel organic compound that can be used for a light-emitting device that emits red light or near-infrared light is provided. An organic compound represented by General Formula (G0) is provided. In General Formula (G0), Q represents oxygen or sulfur, Ar1 represents a substituted or unsubstituted fused aromatic ring, R1 and R2 each independently represent hydrogen or a group with 1 to 100, inclusive, carbon atoms in total, and at least one of R1 and R2 has a hole-transport skeleton or a fused ring.