Polycyclic Aromatic and Anthracene Organic EL Light Emitting Layer
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Solution Overview
Problem
Current organic electroluminescent elements lack a diverse range of materials for light emitting layers, particularly for achieving optimal luminescence characteristics beyond NO-linked compounds, and there is a lack of known methods for manufacturing such materials.
Innovation Solution
An organic electroluminescent element is developed with a light emitting layer comprising a polycyclic aromatic compound linked by boron or oxygen atoms and a specific anthracene-based compound, which enhances luminescence characteristics and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional materials (NO-linked compounds, triphenylamine derivatives) are used for light emitting layers, then manufacturing methods are known and materials are available, but luminescence characteristics are limited and selection range is narrow
Solution Approach 1:
The patent combines polycyclic aromatic compounds with specific anthracene-based compounds to create a composite light emitting layer material. This composite approach enables achievement of optimal luminescence characteristics while expanding the selection range beyond conventional single-material systems.
Solution Approach 2:
The patent changes the chemical structure parameters by selecting specific anthracene-based compounds with particular molecular weights and structural features (formula (3) with specific substituents). This parameter optimization achieves improved luminescence characteristics while maintaining manufacturability through established organic EL fabrication processes.
2Reliability
If new material combinations are developed to improve luminescence characteristics, then light emitting performance is enhanced, but manufacturing complexity increases due to lack of established methods
Solution Approach 1:
The patent employs a universal approach by using anthracene-based compounds that can function both as host materials and in combination with polycyclic aromatic dopants. This multi-functional material design simplifies the manufacturing process by reducing the need for specialized fabrication methods while achieving superior luminescence characteristics.
3Productivity
If anthracene-based compounds with specific structures are used, then quantum efficiency and driving voltage are optimized, but material selection becomes more restrictive
Solution Approach 1:
The patent applies local quality by specifying particular structural features in the anthracene-based compound (formula (3) with defined substituents at specific positions). This localized structural optimization achieves high quantum efficiency and low driving voltage while maintaining sufficient material selection flexibility through various substituent options.
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 provides an organic EL element with low driving voltage and high quantum efficiency, achieving optimal light emitting characteristics through the combination of polycyclic aromatic and anthracene-based compounds.
Implementation Method 1
An organic electroluminescent element comprising a pair of electrodes composed of a positive electrode and a negative electrode and a light emitting layer disposed between the pair of electrodes
Data Source
AI summary
The present invention relates to a light emitting layer material comprising: a polycyclic aromatic compound (1) in which a plurality of aromatic rings are linked by a boron atom and a oxygen atom or a nitrogen atom; and a specific anthracene-based compound (3) that achieves optimum light-emission characteristics in combination with said polycyclic aromatic compound. With this light emitting layer material having optimum light emitting characteristics, it is possible to provide an excellent organic EL element.Ring A to ring C are an aryl ring or the like, Y1 is B (boron), X1 and X2 are —O— or >N—R (provided that at least one is —O—), X is a group represented by formula (3-X1), (3-X2), or (3-X3), Y is —O—, —S— or >N—R29, R29 is a hydrogen atom or an optionally substituted aryl, Ar1 to Ar4 are phenyl, a group represented by formula (4), or the like, and both Ar1 and Ar3 do not simultaneously represent a phenyl.