OLED Emitting-Layer Dopant Compound for Exciton Confinement
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Solution Overview
Problem
Current organic electroluminescence devices face limitations in material longevity and efficiency due to the lack of effective emitting materials for their emitting layers.
Innovation Solution
A novel compound represented by formula (1) is introduced, which can be used as a dopant material in the emitting layer of organic electroluminescence devices, enhancing the device's lifetime and efficiency by forming excitons effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional emitting materials are used in organic EL devices, then the device can operate, but the lifetime and efficiency are limited
Solution Approach 1:
The patent modifies the molecular structure of emitting materials by introducing specific ring systems (XA1, XA2 fused with aliphatic hydrocarbon rings or non-aromatic heterocyclic rings) and nitrogen-containing six-membered rings (XB) with fused hydrocarbon or heterocyclic rings. These structural parameter changes optimize the compound's ability to form excitons and improve device lifetime and efficiency
Solution Approach 2:
The invention creates composite emitting layer materials by combining the novel compound of formula (1) with other organic materials in the emitting layer. This composite approach leverages the unique properties of the nitrogen-containing compound with fused rings to enhance exciton formation while maintaining overall device performance
2Reliability
If effective emitting materials are used to improve efficiency, then exciton formation is enhanced, but material complexity increases
Solution Approach 1:
The patent introduces specific functional regions within the molecule - the nitrogen-containing six-membered ring (XB) with fused rings serves as a localized exciton formation center. This local quality enhancement allows efficient exciton formation without requiring complete molecular redesign, balancing performance with structural manageability
Solution Approach 2:
The compound structure is segmented into distinct functional units: XA1/XA2 groups fused with aliphatic or heterocyclic rings, the central nitrogen-containing six-membered ring (XB) with fused hydrocarbon or heterocyclic rings, and Ra substituents. This segmentation allows systematic optimization of each unit's contribution to exciton formation while managing overall molecular complexity
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 novel compound prolongs the lifetime of organic electroluminescence devices and improves their efficiency by confining electrons and holes within the emitting layer, leading to enhanced exciton formation.
Implementation Method 1
When voltage is applied to an organic electroluminescence device, holes and electrons are injected into an emitting layer from an anode and a cathode, respectively. Then, thus injected holes and electrons are recombined in the emitting layer, and excitons are formed therein.
Data Source
AI summary
A compound represented by the following formula (1):wherein in the formula (1), a ring XB is a six-membered hydrocarbon ring or a six-membered heterocyclic ring having one or two nitrogen atoms; one or more sets of adjacent two of XB1 to XB4 are fused with a substituted or unsubstituted hydrocarbon ring including 5 to 50 ring carbon atoms, or a substituted or unsubstituted heterocyclic ring including 5 to 50 ring atoms; one or more sets of adjacent two of XC1 to XC3 are fused with a substituted or unsubstituted hydrocarbon ring including 5 to 50 ring carbon atoms or a substituted or unsubstituted heterocyclic ring including 5 to 50 ring atoms.