Purely Organic Molecules for Blue-Green Optoelectronic Devices
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Solution Overview
Problem
Current organic optoelectronic devices, such as OLEDs, face challenges in achieving high efficiency and specific emission spectra in the blue, sky-blue, or green spectral range without the use of metal ions, which limits their performance and versatility.
Innovation Solution
Development of purely organic molecules with specific chemical structures, comprising two linked chemical moieties, that exhibit thermally activated delayed fluorescence (TADF) and high photoluminescence quantum yields, specifically designed for use in optoelectronic devices to enhance efficiency and emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If metal complexes are used in organic optoelectronic devices, then device efficiency can be improved, but the use of metal ions limits versatility and creates harmful factors
Solution Approach 1:
The invention extracts and removes metal ions from the luminescent material system, replacing them with purely organic compounds. This extraction eliminates the harmful effects associated with metal ions while maintaining the desired luminescent properties through organic-based TADF mechanisms
Solution Approach 2:
The patent employs purely organic compounds that are more environmentally friendly and versatile compared to metal complexes. These organic materials offer improved sustainability and reduced harmful effects while achieving comparable or superior device performance
2Adaptability or versatility
If purely organic molecules are used instead of metal complexes, then versatility and reduction of harmful factors are improved, but achieving high efficiency and specific emission spectra becomes more difficult
Solution Approach 1:
The invention systematically varies molecular parameters including substituent types, positions, and combinations to optimize the TADF properties of organic molecules. By changing parameters such as electron-donating and electron-withdrawing groups, the patent achieves high photoluminescence quantum yields and specific emission spectra in the blue, sky-blue, and green ranges
Solution Approach 2:
The patent creates composite molecular structures combining electron-donating moieties and electron-withdrawing moieties in specific configurations. These composite organic structures enable efficient TADF by creating appropriate energy level differences while maintaining purely organic composition for enhanced versatility
3Illumination intensity
If organic molecules with emission maxima between 420 nm and 520 nm are designed, then emission characteristics in the desired spectral range are improved, but molecular structure complexity increases
Solution Approach 1:
The invention divides the luminescent molecule into distinct functional segments: electron-donating moieties and electron-withdrawing moieties. This segmentation allows independent optimization of each component's properties while maintaining overall molecular simplicity and facilitating targeted emission in the 420-520 nm range
Solution Approach 2:
The patent applies local quality by placing specific substituents at strategic positions on the molecular core. By controlling the local electronic environment through targeted substituent placement, the invention achieves precise control over emission wavelength and intensity without requiring complex overall molecular structures
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 new organic molecules achieve higher efficiencies in optoelectronic devices by providing emission maxima in the desired spectral range with improved photoluminescence quantum yields and thermal stability, leading to enhanced performance and versatility in optoelectronic applications.
Implementation Method 1
The molecules according to the invention exhibit in particular thermally activated delayed fluorescence (TADF)
Data Source
Figure 1
AI summary
The invention relates to an organic molecule, in particular for use in organic optoelectronic devices. According to the invention, the organic molecule consists of - one first chemical moiety with a structure of formula I, and - one second chemical moiety with a structure of formula II, wherein the first chemical moiety is linked to the second chemical moiety via a single bond; wherein T is the binding site of a single bond linking the first chemical moiety to one of the two second chemical moieties, or selected from the group consisting of R1 and RT; V is the binding site of a single bond linking the first chemical moiety to one of the two second chemical moieties or is hydrogen; W is the binding site of a single bond linking the first chemical moiety to one of the two second chemical moieties, or selected from the group consisting of R1 and RT; X is selected from the group consisting of R1 and RT; Y is selected from the group consisting of R1 and RT; wherein exactly one substituent selected from the group consisting of T, W, X, and Y is RT, and exactly one substituent selected from the group consisting of T, V and W represents the binding site of a single bond linking the first chemical moiety and the second chemical moiety; and wherein exactly two substituents selected from the group consisting of RI, RII, RIII, RIV and RV are F.