Deuterated OLED Emitting Material for Efficiency and Lifetime
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges with low luminous efficiency and short luminous lifetime, particularly due to the use of fluorescent materials and metal complexes, which are not economically viable for commercial use.
Innovation Solution
Incorporating an organic compound with a triazine moiety substituted by an aromatic or hetero-aromatic group and a carbazole moiety fused with an aromatic ring, where specific nuclear atoms are substituted with deuterium, into the emitting material layer of the OLED.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fluorescent material is used in OLED, then device structure is simple, but luminous efficiency is low
Solution Approach 1:
The patent changes the chemical composition parameters of the emitting material by introducing deuterium substitution in specific positions of the organic compound molecules. This parameter change enhances the luminous efficiency without significantly complicating the device structure, as the modified organic compound is directly incorporated into the existing OLED emitting layer.
Solution Approach 2:
The patent employs composite organic compounds combining triazine moieties with aromatic/hetero aromatic groups and carbazole moieties. These composite materials exhibit improved photophysical properties and luminous efficiency while maintaining compatibility with standard OLED device architecture.
2Use of energy by moving object
If phosphorescent material is used in OLED, then luminous efficiency is improved, but luminous lifetime is too short
Solution Approach 1:
The patent modifies the molecular structure parameters of phosphorescent materials through deuterium substitution at specific positions. This changes the vibrational frequencies and reduces non-radiative decay pathways, thereby extending the luminous lifetime while preserving the high luminous efficiency characteristic of phosphorescent materials.
Solution Approach 2:
The patent addresses the short lifetime issue by developing organic compounds with enhanced stability through deuterium substitution. The modified compounds maintain the short-lived excited states necessary for high efficiency while improving the overall operational stability and lifetime of the OLED device.
3Use of energy by moving object
If deuterium is substituted in all positions of organic compound, then luminous efficiency and lifetime are maximized, but manufacturing cost increases
Solution Approach 1:
The patent applies deuterium substitution selectively at specific positions within the organic compound molecules rather than uniformly across all positions. This local quality approach concentrates the deuterium substitution at critical sites where it most effectively enhances luminous efficiency and lifetime, while minimizing the overall cost by reducing the total amount of expensive deuterium material required.
Solution Approach 2:
The patent employs partial deuterium substitution rather than complete substitution. By applying deuterium only at the most critical positions that provide maximum benefit for luminous efficiency and lifetime enhancement, the patent achieves significant performance improvement while controlling manufacturing costs through reduced deuterium consumption.
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
This approach enhances luminous efficiency and lifetime while reducing manufacturing costs by selectively using deuterium, offering improved durability against external stress such as heat.
Implementation Method 1
at least one of nuclear atoms among the aromatic and/or hetero aromatic groups substituted to the triazine moiety and the aromatic or hetero aromatic linker is substituted with deuterium
Implementation Method 2
The deuterium has excellent resistance against external stress such as heat. In particular, the organic light emitting diode including an organic compound in which deuterium is substituted for the specific moiety where thermal decomposition can easily occur can improve its luminous efficiency and luminous life time
Data Source
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AI summary
The present disclosure relates to an organic light emitting diode that comprises an organic compound in which a carbazole moiety fused with an aromatic ring and a hetero aromatic ring is linked to a triazine moiety substituted with aromatic and/or hetero aromatic groups via an aromatic linker, and at least one protium constituting the aromatic and/or hetero aromatic groups of the triazine moiety and the aromatic linker moiety is substituted with deuterium, and an organic light emitting device including the diode. The molecular conformation of the deuterium-substituted triazine moiety and the aromatic linker moiety is not deteriorated and dissolved, and therefore, the organic compound can implement luminous efficiency and luminous lifetime as an organic compound in which whole protiums are substituted with deuteriums.