Deuterated Organic Host Material for OLED Lifetime Extension
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Solution Overview
Problem
Current light-emitting devices face challenges with efficiency deterioration and burn-in issues, particularly due to the degradation of emission center substances and surrounding materials, requiring host materials with improved heat resistance and longer lifetimes, while existing deuteration techniques are complex and costly.
Innovation Solution
Development of a novel organic compound with a benzofuropyrimidine skeleton and deuterated dibenzothiophene or dibenzofuran skeleton, which acts as a bipolar substance for both hole and electron transport, inhibiting carbon-hydrogen bond dissociation and simplifying synthesis by selective deuteration of partial structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If deuteration technique is applied to host material, then lifetime of light-emitting device is extended, but synthesis complexity and manufacturing cost increase
Solution Approach 1:
The patent applies selective deuteration only to specific positions in the host material molecule (positions indicated by asterisks in the formula) rather than complete deuteration of all hydrogen atoms. This localized approach maintains the beneficial effect of extended device lifetime while significantly reducing synthesis complexity and cost compared to full deuteration.
2Reliability
If host material with higher heat resistance is used, then deterioration of light-emitting device is inhibited, but synthesis complexity increases
Solution Approach 1:
The patent employs a composite molecular structure combining a benzofuropyrimidine core with deuterated dibenzothiophene or dibenzofuran units. This composite structure achieves high heat resistance and reliability while the modular design facilitates simplified synthesis through sequential construction of the molecular components.
3Reliability
If organic compound is used as host material, then efficiency and lifetime are improved, but carbon-hydrogen bond dissociation occurs leading to deterioration
Solution Approach 1:
The patent changes the isotopic parameter of hydrogen to deuterium at specific positions in the organic compound. This parameter change increases the bond dissociation energy of C-D bonds compared to C-H bonds, thereby suppressing carbon-hydrogen bond dissociation and preventing deterioration while maintaining efficient light-emitting performance.
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 provides a stable excited state, reduces manufacturing costs, and enhances the driving lifetime of light-emitting devices with low power consumption, while maintaining high efficiency and heat resistance.
Implementation Method 1
Light-emitting devices (organic EL elements) including organic compounds and utilizing electroluminescence (EL) have been put to more practical use. Carriers are injected by application of voltage to the element, and recombination energy of the carriers is used, whereby light emission can be obtained from the light-emitting material.
Implementation Method 2
a technique for substituting deuterium for hydrogen contained in a host material (a deuteration technique) is disclosed (Patent Document 3). Although deuteration of a host material is effective for a longer lifetime of a light-emitting device
Data Source
AI summary
An organic compound that is stable in an excited state and has high emission efficiency is provided. An organic compound represented by General Formula (G1) is provided. Note that in General Formula (G1), Q1 represents sulfur or oxygen. R1 to R5 each independently represent hydrogen, deuterium, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms, a substituted or unsubstituted polycyclic alkyl group having 6 to 10 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms. In addition, A1 represents an aryl group having 6 to 100 carbon atoms and including a substituted or unsubstituted substituent, or a heteroaryl group having 2 to 100 carbon atoms and including a substituted or unsubstituted substituent. Deuterium is substituted for at least one of hydrogen contained in R1 to R5 and A1.