Benzofuropyrimidine Host Materials for Phosphorescent OLEDs
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Solution Overview
Problem
Current light-emitting elements with organic EL layers face limitations in achieving improved characteristics such as efficiency and reliability due to the statistical generation ratio of singlet and triplet excited states, which affects emission spectrum and color variability.
Innovation Solution
Development of novel organic compounds with benzofuropyrimidine or benzothienopyrimidine skeletons and polycyclic aromatic hydrocarbons for use in light-emitting elements, specifically as host materials for phosphorescent materials, enhancing the T1 level and enabling efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic compounds are used in light-emitting elements, then the device structure is simple and manufacturing is easier, but the luminance efficiency and reliability are limited due to statistical generation ratio of singlet and triplet excited states
Solution Approach 1:
The patent applies parameter changes by modifying the T1 energy level of organic compounds through systematic structural variations. Specific structural parameters (m, n, R1-R12 groups) are adjusted to optimize the T1 level, thereby improving luminance efficiency and reliability while maintaining controllable complexity
Solution Approach 2:
The patent employs composite materials by combining benzofuropyrimidine or benzothienopyrimidine core structures with various polycyclic aromatic hydrocarbon groups (A1, A2). This composite approach allows tuning of photophysical properties including T1 level and emission characteristics, achieving improved performance through material composition rather than simple structural complexity
2Adaptability or versatility
If different types of organic compounds are used to achieve various emission colors, then color variability is improved, but the emission spectrum and color consistency are affected by statistical generation ratio of excited states
Solution Approach 1:
The patent uses parameter changes to control the T1 energy level across different compound variants, enabling systematic tuning of emission colors while maintaining consistent photophysical behavior. By adjusting structural parameters (m, n, and substituent groups), the emission spectrum can be optimized for different colors while preserving reliability through controlled T1 levels
Solution Approach 2:
The patent applies local quality by introducing specific substituent groups (R1-R12) at particular positions on the molecular structure. These localized modifications allow independent optimization of emission color characteristics while maintaining the overall molecular framework and T1 level control, achieving color variability without compromising emission spectrum consistency
3Productivity
If the T1 level is optimized in organic compounds, then light emission efficiency and luminance are enhanced, but the compound structure becomes more complex requiring precise structural parameters
Solution Approach 1:
The patent systematically varies structural parameters (m ranging from 0-4, n ranging from 1-4, and different R1-R12 substituent groups) to optimize the T1 energy level. This parameter optimization approach enhances light emission efficiency and luminance while providing a structured framework for managing molecular complexity through defined parameter ranges
Solution Approach 2:
The patent achieves universality by developing a family of compounds based on the benzofuropyrimidine/benzothienopyrimidine core that can serve multiple functions: achieving high T1 levels for efficient phosphorescence, providing color tunability through substituent variations, and maintaining structural stability. This multi-functional design reduces the need for completely different molecular frameworks
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 compounds improve the reliability and performance of light-emitting elements by optimizing the T1 level, allowing for better light emission characteristics and color variability, leading to enhanced luminance and efficiency.
Implementation Method 1
Light emission from a singlet excited state is referred to as fluorescence
Implementation Method 2
light emission from a triplet excited state is referred to as phosphorescence
Implementation Method 3
Development of novel organic compounds with benzofuropyrimidine or benzothienopyrimidine skeletons and polycyclic aromatic hydrocarbons for use in light-emitting elements, specifically as host materials for phosphorescent materials, enhancing the T1 level and enabling efficient light emission
Data Source
AI summary
A benzofuropyrimidine derivative or a benzothienopyrimidine derivative that is a novel organic compound is provided. The organic compound has a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton and is represented by General Formula (G1) below. In General Formula (G1), Q represents oxygen or sulfur. Each of A1 and A2 independently represents a substituted or unsubstituted polycyclic aromatic hydrocarbon. Furthermore, m represents any one of integers from 0 to 4. Furthermore, n represents any one of integers from 1 to 4. Each of R1 to R12 independently represents any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 7 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms.