Organic Light-Emitting Diode Hole Adjusting Layer Voltage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a continuous need for developing new materials to improve the efficiency and stability of organic light emitting diodes, particularly in reducing driving voltage and enhancing service life.
Innovation Solution
The organic light emitting diode incorporates a positive electrode, a negative electrode, and a light emitting layer with a hole adjusting layer containing specific compounds from Formulae 1 and 2, which include fluorene units and amine groups for effective hole transport, and a light emitting layer with a compound from Formula 3 featuring an indolocarbazole core, optimizing energy levels and carrier movement.
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 service life is short
Solution Approach 1:
The patent segments the light emitting layer into multiple sub-layers with distinct functions: a first light emitting layer containing compound (1) for primary light emission, a second light emitting layer containing compound (2) for enhanced stability and efficiency, and a third light emitting layer containing compound (3) for additional performance optimization. This segmentation allows each layer to be optimized independently for specific functions while working together to resolve the contradiction between reliability and structural complexity.
Solution Approach 2:
The patent employs composite materials by combining three different organic compounds with complementary properties in the light emitting layer. Compound (1) provides base light emitting functionality, compound (2) enhances thermal stability and charge transport, and compound (3)进一步优化s the energy levels and carrier balance. This composite approach achieves extended service life and improved efficiency while managing the complexity through systematic material selection.
2Power
If standard hole transporting materials are used, then the manufacturing process is simple, but the driving voltage remains high
Solution Approach 1:
The patent applies parameter changes by carefully selecting compounds with specific energy level parameters. Compound (1) has HOMO/LUMO levels optimized for hole injection, compound (2) has parameters tuned for balanced charge transport, and compound (3) has energy levels matched to achieve optimal carrier balance at the interface with the electron transporting layer. These parameter optimizations collectively reduce the driving voltage from conventional levels while maintaining manufacturing feasibility through well-established organic material processing techniques.
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 configuration results in a device with lower driving voltage, higher efficiency, and extended service life due to the combination of materials in the hole adjusting and light emitting layers, providing improved device characteristics.
Implementation Method 1
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy by using an organic material
Data Source
AI summary
Provided is an organic light-emitting diode comprising: a positive electrode; a negative electrode provided to face the positive electrode; a light-emitting layer provided between the positive electrode and the negative electrode; a hole adjusting layer having one or more layers provided between the positive electrode and the light-emitting layer, in which one or more layers of the hole adjusting layers includes at least one compound of Formulae 1 or Formula 2, and the light-emitting layer includes a compound of Formula 3:wherein:G1 to G4 are each independently a substituted or unsubstituted alkyl or aryl group;L1 to L7 are each independently a direct bond, or a substituted or unsubstituted arylene or heteroarylene group;at least one of X1 to X3 is N, and any remaining is each CR8; andAr1 to Ar6 are each independently a substituted or unsubstituted aryl or heteroaryl group, or Ar2 and Ar3 together form a substituted or unsubstituted hetero ring.