Blue Emissive Organic Compound Balancing Chromaticity and Reliability
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Solution Overview
Problem
Current organic EL displays face challenges in achieving high resistance, efficient light emission, favorable chromaticity, particularly blue light emission, and low power consumption, with existing materials lacking in reliability and emission efficiency.
Innovation Solution
Development of an organic compound with a naphthobisbenzofuran skeleton, incorporating substituted or unsubstituted aromatic hydrocarbon groups, dibenzofuranyl, dibenzothiophenyl, and carbazolyl groups, which enhances carrier-transport properties and emission efficiency, leading to improved light-emitting elements with favorable chromaticity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing organic EL materials are used, then device structure is simple, but emission efficiency and reliability are insufficient
Solution Approach 1:
The patent employs composite material strategy by combining multiple functional groups (naphthobisbenzofuran skeleton, dibenzofuranyl, dibenzothiophenyl, carbazolyl groups) into a single organic compound. This composite molecular structure integrates carrier transport, light emission, and stability functions, thereby improving emission efficiency and reliability while avoiding the need for complex multi-layer device structures.
Solution Approach 2:
The patent applies parameter changes by modifying molecular parameters such as introducing specific aromatic hydrocarbon groups with 6-25 carbon atoms, adjusting the number of dibenzofuranyl/dibenzothiophenyl/carbazolyl groups (q=1 or 2), and varying substituent positions (α1-α3). These parameter optimizations enhance carrier-transport properties and emission efficiency without fundamentally changing the device architecture.
2Use of energy by moving object
If materials with high emission efficiency are developed, then power consumption is reduced, but material synthesis complexity increases
Solution Approach 1:
The patent optimizes synthesis ease by controlling molecular parameters within specific ranges: aromatic hydrocarbon groups with 6-25 carbon atoms (manageable synthesis scale), q=1 or 2 (limited number of functional groups), and systematic substituent positions. These parameter constraints balance emission efficiency improvement with synthetic feasibility, avoiding overly complex multi-step syntheses.
3Illumination intensity
If blue light emission with favorable chromaticity is achieved, then display quality is improved, but emission efficiency may be compromised
Solution Approach 1:
The patent applies local quality principle by strategically placing specific functional groups at specific positions within the molecular structure. The naphthobisbenzofuran skeleton provides the core chromaticity characteristics for blue light emission, while dibenzofuranyl, dibenzothiophenyl, and carbazolyl groups are positioned at specific locations (indicated by q=1 or 2 and positions α1-α3) to optimize both chromaticity and carrier transport for efficient emission.
Solution Approach 2:
The patent uses composite material approach by integrating multiple functional moieties (naphthobisbenzofuran for chromaticity, carbazolyl/dibenzofuranyl/dibenzothiophenyl for carrier transport and stability) into a unified molecular structure. This composite design achieves favorable blue light chromaticity while maintaining high emission efficiency through synergistic functional group interactions.
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 exhibits high emission efficiency, favorable blue light emission, and improved reliability, enabling the creation of light-emitting elements with low driving voltage and high power efficiency, suitable for display devices with enhanced display quality and reduced power consumption.
Implementation Method 1
Some display devices and light-emitting devices using organic EL elements are practically used
Data Source
AI summary
A novel organic compound is provided. Alternatively, an organic compound that exhibits light emission with favorable chromaticity is provided. Alternatively, an organic compound that exhibits blue light emission with favorable chromaticity is provided. Alternatively, an organic compound with favorable emission efficiency is provided. Alternatively, an organic compound having a high carrier-transport property is provided. Alternatively, an organic compound with favorable reliability is provided. An organic compound including at least one amino group in which any one of a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, and a substituted or unsubstituted carbazolyl group is bonded to any one of a substituted or unsubstituted naphthobisbenzofuran skeleton, a substituted or unsubstituted naphthobisbenzothiophene skeleton, and a substituted or unsubstituted naphthobenzofuranobenzothiophene skeleton is provided.