Organic Electroluminescent Compound for Centered Recombination
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Solution Overview
Problem
Existing organic electroluminescent devices face challenges with inefficient hole injection, leading to increased driving voltage and decreased luminous efficiency due to imbalanced movement of holes and electrons, resulting in the combination region being off-center in the light-emitting layer.
Innovation Solution
The use of an organic electroluminescent compound represented by Formula 1, which balances the movement of holes and electrons, enhancing the efficiency and reducing driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic electroluminescent device structure is used, then device can be manufactured, but hole injection is inefficient and driving voltage increases
Solution Approach 1:
The patent modifies the molecular structure parameters of the organic electroluminescent compound by introducing specific substituents (electron-donating or electron-withdrawing groups) at defined positions (R1-R6) to optimize the compound's electronic properties, thereby improving hole injection efficiency and reducing driving voltage
Solution Approach 2:
The patent creates composite organic electroluminescent compounds that combine multiple functional groups and structural elements (aromatic rings, heteroatoms, substituents) within a single molecular framework to achieve both efficient hole injection and reduced driving voltage simultaneously
2Reliability
If conventional organic electroluminescent compound is used, then device can operate, but movement degree of holes and electrons is imbalanced
Solution Approach 1:
The patent adjusts the molecular parameters of the organic compound including the type and position of substituents (R1-R6), heteroatoms (X, Y), and aromatic ring structures to control the movement degrees of holes and electrons, achieving balanced charge transport and improved luminous efficiency
Solution Approach 2:
The patent introduces different functional groups at specific local positions (R1-R6) of the molecular structure to create localized regions with different electron transport properties, thereby balancing the overall charge carrier movement throughout the material
3Reliability
If conventional organic electroluminescent compound is used, then device can function, but combination region of holes and electrons is off-center
Solution Approach 1:
The patent modifies molecular parameters including the positions of electron-donating and electron-withdrawing substituents (R1-R6) and the arrangement of aromatic rings to control the internal electric field distribution, thereby positioning the electron-hole recombination region at the center of the light-emitting layer for optimal luminous efficiency
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 compound achieves low driving voltage, high luminous efficiency, and extended lifespan in organic electroluminescent devices by balancing electron and hole movement.
Implementation Method 1
The organic light-emitting compound moves into an excited state by the energy and emits light from energy when the organic light-emitting compound returns to the ground state from the excited state.
Data Source
AI summary
The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound according to the present disclosure, an organic electroluminescent device having low driving voltage and/or high luminous efficiency and/or long lifespan can be provided.