Single Cyano Group Compound for Delayed Fluorescent OLED Materials
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Solution Overview
Problem
The challenge lies in identifying a chemical structure that can emit delayed fluorescent light, as compounds similar to those described in existing literature do not necessarily emit delayed fluorescent light, making it difficult to estimate their light emission efficiency and requiring the discovery of new compounds beyond the proposed range.
Innovation Solution
A compound with a structure containing a benzene ring having only one cyano group substituted, specifically represented by a general formula, is found to emit delayed fluorescent light, which can be used as a light-emitting material in organic light-emitting devices, enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compounds similar to those described in existing literature (PTL 1) are used, then the light emission efficiency can be enhanced, but it is difficult to estimate whether delayed fluorescent light is emitted and new compounds must be discovered from outside the proposed range
Solution Approach 1:
The patent changes the key parameter from multiple cyano groups (two or more as in PTL 1) to a single cyano group substituted on a benzene ring. This parameter change simplifies the compound structure while maintaining the ability to emit delayed fluorescent light, resolving the contradiction between reliability of light emission and structural complexity
2Reliability
If compounds with multiple cyano groups substituted on benzene ring are used, then delayed fluorescent light can be emitted, but the structural requirements are complex and limit the range of discoverable compounds
Solution Approach 1:
The patent extracts the essential feature for delayed fluorescent light emission from the complex structure in PTL 1, identifying that only one cyano group substituted on a benzene ring is necessary. This extraction simplifies the structural requirements and expands the range of applicable compounds by removing unnecessary complexity
3Adaptability or versatility
If new compounds are discovered from outside the proposed range in PTL 1, then the range of light-emitting compounds can be expanded, but it is difficult to estimate light emission efficiency from structure
Solution Approach 1:
The patent performs preliminary action by establishing a clear structural guideline (single cyano group on benzene ring with specific substituents) before compound discovery. This preliminary structural definition enables accurate estimation of delayed fluorescent light emission capability from structure, resolving the measurement precision issue while maintaining expanded compound range
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 use of this compound as a light-emitting material in organic light-emitting devices effectively utilizes triplet excitation energy for light emission, achieving high light emission efficiency.
Implementation Method 1
a compound in an excited state through application of energy undergoes reverse intersystem crossing from the excited triplet state to the excited singlet state, and then the excited singlet state returns to the ground state to emit the fluorescent light
Implementation Method 2
the energy of the excited triplet state, which has a large formation probability, can be converted to fluorescent light and thus can be effectively utilized for light emission
Data Source
AI summary
A compound having a structure represented by the following general formula emits delayed fluorescent light, and is useful as a light-emitting material. One or more of R1, R2, R3, R4, and R5 represent a 9-carbazolyl group having a substituent at at least one of 1-position and 8-position, or a 10-phenoxazyl group or 10-phenothiazyl group having a substituent at at least one of 1-position and 9-position. The balance thereof represents a hydrogen atom or a substituent.