Organic Light-Emitting Element With Phenylcarbazole Skeleton
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Solution Overview
Problem
Current light-emitting elements using organic compounds face challenges in achieving high emission efficiency and low power consumption due to limitations in material properties and structural optimization.
Innovation Solution
Incorporating an organic compound with a phenylcarbazole skeleton, having a high hole-transport property, between electrodes, with specific molecular weights and absorption edges, to enhance emission efficiency and reduce driving voltage, while using LC/MS analysis to identify product ions and optimize layer structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic compounds are used in light-emitting elements, then the element structure can be maintained, but emission efficiency is insufficient and power consumption is high
Solution Approach 1:
The patent changes the molecular parameters of the organic compound by introducing a phenylcarbazole skeleton structure with specific molecular weight (450-1500) and absorption edge (≥380 nm). This parameter optimization enables high hole-transport property while maintaining stability, thereby improving emission efficiency and reducing power consumption simultaneously
Solution Approach 2:
The patent employs composite material design by combining phenylcarbazole skeleton with specific molecular structures that exhibit both high hole-transport property and appropriate optical properties. This composite approach allows the material to achieve multiple functions: efficient charge transport, stable excited state formation, and reduced energy loss
2Reliability
If the organic compound molecular weight is increased to improve hole transport, then emission efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent defines a specific molecular weight range (450-1500) that balances hole-transport capability with manufacturability. This parameter optimization ensures that compounds are not too large for synthesis and purification while still achieving the desired transport properties for high emission efficiency
Solution Approach 2:
The patent focuses optimization on the phenylcarbazole skeleton structure rather than increasing overall molecular complexity. By concentrating the functional groups and structural features in a specific local region (the phenylcarbazole core), the material achieves high hole-transport property without proportionally increasing manufacturing difficulty
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 solution results in a light-emitting element with high emission efficiency and low power consumption, enabling the development of devices with improved performance and efficiency in light-emitting devices, electronic devices, and lighting devices.
Implementation Method 1
The absorption edge of the organic compound is at 380 nm or more
Implementation Method 2
a layer containing a light-emitting substance is interposed between a pair of electrodes. By applying voltage to this element, light emission from the light-emitting substance can be obtained
Implementation Method 3
The organic compound has a high hole-transport property
Data Source
AI summary
To provide a light-emitting element with high emission efficiency. In a light-emitting element including an organic compound between a pair of electrodes, the molecular weight X of the organic compound is 450 or more and 1500 or less, and the absorption edge of the organic compound is at 380 nm or more. By liquid chromatography mass spectrometry in a positive mode in which an argon gas is made to collide with the organic compound subjected to separation using a liquid chromatograph at any energy higher than or equal to 1 eV and lower than or equal to 30 eV, a product ion is detected at least around m/z=(X−240).