Organic Compound for Light-Emitting Elements
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Solution Overview
Problem
Current light-emitting elements, such as organic EL elements, face challenges in achieving high heat resistance and reliability, which affects their performance and longevity, particularly in display and lighting applications, and they also suffer from crosstalk issues that impact display quality.
Innovation Solution
A novel organic compound with a 2,2′-(pyridine-2,6-diyl)bipyrimidine skeleton is developed, which acts as an electron-transport and injection material, providing high heat resistance and improved reliability when used in light-emitting elements, especially in layers contact with the anode side of charge-generation layers, thereby reducing luminance decay and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic compounds are used in light-emitting elements, then the basic light emission function is achieved, but heat resistance and reliability are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of organic compounds by introducing specific heterocyclic rings (pyrimidine, triazine, pyridine) and adjusting substituent groups to achieve optimal heat resistance and electron transport properties simultaneously
Solution Approach 2:
The patent creates composite organic compounds combining multiple heterocyclic structures (e.g., pyridine-pyrimidine-biphenyl combinations) to achieve synergistic effects that improve both thermal stability and electronic properties beyond what single structures can provide
2Reliability
If conventional organic compounds are used, then manufacturing is simpler, but display quality is degraded due to crosstalk
Solution Approach 1:
The patent optimizes the local electronic properties of organic compounds at specific positions (electron injection layers, transport layers) to control charge distribution and prevent charge leakage into adjacent pixels, thereby reducing crosstalk while maintaining overall device functionality
3Duration of action of moving object
If existing electron-transport materials are used, then device assembly is straightforward, but luminance decay occurs reducing lifespan
Solution Approach 1:
The patent designs organic compounds with continuous and stable electron transport capabilities that maintain consistent performance over time, preventing the degradation and luminance decay that occur with conventional materials through optimized molecular stability and electron mobility
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 enhances the reliability and heat resistance of light-emitting elements, leading to improved display quality and extended lifespan, while also suppressing crosstalk, making it suitable for high-performance display and lighting devices.
Implementation Method 1
acts as an electron-transport and injection material, providing high heat resistance and improved reliability when used in light-emitting elements
Implementation Method 2
By voltage application to this element, light emission from the light-emitting substance can be obtained
Data Source
AI summary
An object is to provide an organic compound having high heat resistance and a light-emitting element, a light-emitting device, an electronic device, and a display device each having high reliability. Provided are an organic compound having a 2,2′-(pyridine-2,6-diyl)bipyrimidine skeleton in which the 2-positions of pyrimidine skeletons are bonded to the 2- and 6-positions of a pyridine skeleton, and having a structure in which at least one aryl group having a fused structure with 10 to 16 carbon atoms is bonded to the 2,2′-(pyridine-2,6-diyl)bipyrimidine skeleton, and a light-emitting element, a light-emitting device, an electronic device, and a display device each containing the organic compound.