Thioxanthone Compound for OLED Light Emission Efficiency
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Solution Overview
Problem
Current organic light emitting elements, particularly phosphorescent ones, face limitations in light emission efficiency and require materials with higher T1 energy and deep LUMO levels for improved performance and stability.
Innovation Solution
A thioxanthone compound with a high T1 energy of 2.3 eV or more and a deep LUMO level of 2.7 eV or more is developed, suitable for use as an electron transporting material in organic light emitting elements, enhancing light emission efficiency and reducing drive voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional phosphorescent light emitting materials are used, then light emission can be achieved, but light emission efficiency is insufficient
Solution Approach 1:
The patent changes the energy parameters of the light emitting material by developing a thioxanthone compound with T1 energy of 2.3 eV or more and LUMO level of 2.7 eV or more, optimizing these parameters to achieve both high light emission efficiency and stable performance
Solution Approach 2:
The patent uses a composite structure where the thioxanthone compound serves as both the light emitting material and electron transporting material, combining multiple functions in one material to improve overall device efficiency and stability
2Loss of energy
If electron transporting materials with insufficient T1 energy are used, then device operation is possible, but light emission efficiency decreases
Solution Approach 1:
The thioxanthone compound performs multiple functions simultaneously: it acts as both the phosphorescent light emitting material and the electron transporting material, eliminating the need for separate materials and simplifying the manufacturing process while achieving high efficiency
Solution Approach 2:
The patent specifies precise energy parameters (T1 ≥ 2.3 eV, LUMO ≥ 2.7 eV) for the thioxanthone compound to ensure optimal electron transport capability and light emission efficiency, making the material both high-performance and manufacturable
3Ease of operation
If materials with shallow LUMO level are used, then electron transport is easier, but chemical stability decreases
Solution Approach 1:
The patent optimizes the LUMO level parameter to be 2.7 eV or more, which provides the right balance between electron transport capability and chemical stability, preventing both electron transport difficulties and chemical degradation
Solution Approach 2:
The thioxanthone structure provides localized chemical stability through its molecular structure while maintaining appropriate electron transport properties through its energy levels, achieving both requirements in different aspects of the material
4Use of energy by moving object
If drive voltage is reduced, then energy consumption decreases, but light emission efficiency may be compromised
Solution Approach 1:
The patent optimizes the energy parameters of the thioxanthone compound to achieve low drive voltage operation while maintaining high light emission efficiency, with the compound's T1 and LUMO parameters enabling efficient electron transport and radiative recombination at reduced voltages
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 thioxanthone compound significantly improves light emission efficiency and stability of organic light emitting elements by providing a suitable T1 energy and deep LUMO level, enabling efficient electron transport and reduced drive voltage.
Implementation Method 1
an organic compound which has a deep LUMO level of 2.7 eV or higher and is chemically stable is required
Implementation Method 2
The phosphorescent light emitting material absorbs energy generated by recombination of holes and electrons and generates triplet excitons
Implementation Method 3
an organic compound which has a deep LUMO level of 2.7 eV or higher and is chemically stable is required
Data Source
AI summary
Provided is an organic light emitting element having a high light emission efficiency and a low drive voltage. In the organic light emitting element including a positive electrode, a negative electrode and an organic compound layer disposed between the positive electrode and the negative electrode, the organic compound layer includes a thioxanthone compound represented by the following general formula [1].