OLED Emitting Layer Composition Using Deuterated Organic Compounds
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Solution Overview
Problem
There is a need for an organic light emitting device with improved driving voltage, efficiency, and lifetime.
Innovation Solution
The device incorporates a light emitting layer composed of a first compound of Chemical Formula 1 and a second compound of Chemical Formula 2, where the compounds include benzene rings fused with adjacent pentagonal rings and specific aryl or heteroaryl groups, with at least one of the substituents being deuterium, to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic materials are used in the light emitting layer, then the device structure is simple, but the driving voltage is high and lifetime is short
Solution Approach 1:
The patent substitutes hydrogen atoms with deuterium atoms in the organic compound structures (Formulas 1 and 2). This isotopic substitution changes the physical and chemical parameters of the materials, resulting in improved device lifetime and reduced driving voltage while maintaining the overall molecular structure and device architecture
Solution Approach 2:
The patent employs a composite light emitting layer containing two different organic compounds (Formula 1 and Formula 2) with specific structural features including fused pentagonal rings and deuterium substitution. This composite material approach synergistically improves device performance, achieving low driving voltage and long lifetime simultaneously
2Productivity
If conventional organic materials are used in the light emitting layer, then the manufacturing process is simple, but the efficiency is low
Solution Approach 1:
The deuterium substitution in the organic compounds (Formulas 1 and 2) modifies the material properties to enhance device efficiency. The isotopic change affects vibrational modes and energy levels, leading to improved electroluminescence efficiency while the manufacturing process remains relatively straightforward
Solution Approach 2:
The patent introduces specific structural features at localized positions within the molecules (fused pentagonal rings at specific positions, deuterium at specific locations) to optimize electron-hole recombination and light emission efficiency, rather than uniformly modifying the entire molecular structure
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 device achieves improved driving voltage, efficiency, and lifetime by utilizing these compounds in the light emitting layer.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Implementation Method 2
at least one of Ar1 to Ar3, and R1 is substituted with at least one deuterium, or at least one of R1 is deuterium, and the first compound comprises at least 5 deuteriums
Data Source
AI summary
Provided is an organic light emitting device having improved driving voltage, efficiency and lifetime, the device including a light emitting layer comprising a first compound of Chemical Formula 1 and a second compound of Chemical Formula 2:A is a benzene ring fused with the two pentagonal rings;Ar1 to Ar3 are each independently a substituted or unsubstituted C6-20 aryl or C5-60 heteroaryl containing one or more of N, O and S;provided that at least one of Ar1-Ar3, and R1 is substituted with at least one deuterium, or at least one of R1 is deuterium, and the first compound comprises at least 5 deuteriums;B is a benzene ring fused with the two pentagonal rings;Ar4 is a substituted or unsubstituted C6-60 aryl; andAr5 is a substituted or unsubstituted C6-60 aryl or C5-50 heteroaryl containing one of N, O and S.