Condensed-Cyclic Compound for OLED Driving Voltage and Efficiency
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Solution Overview
Problem
Conventional organic light emitting diodes face challenges in achieving low driving voltage, high current density, high efficiency, and high luminosity simultaneously.
Innovation Solution
Incorporating a condensed-cyclic compound in the organic layer of an organic light emitting diode, which can be synthesized using specific organic synthesis methods, to enhance the device's performance by optimizing the hole transport and light emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic compounds are used in the organic layer, then the device structure is simple, but the driving voltage is high and efficiency is low
Solution Approach 1:
The patent changes the chemical structure parameters of the organic compound by introducing a condensed-cyclic core structure with specific molecular weight and conjugation length. This structural parameter change optimizes the HOMO-LUMO energy levels and improves charge transport properties, thereby reducing driving voltage while maintaining manufacturing simplicity
Solution Approach 2:
The patent employs a composite molecular design combining condensed-cyclic core structures with specific substituent groups. This composite approach creates a compound that simultaneously achieves low driving voltage, high current density, and high luminosity by synergistically combining the electronic properties of different molecular components
2Productivity
If conventional organic compounds are used in the organic layer, then the manufacturing process is simple, but the current density and luminosity are insufficient
Solution Approach 1:
The patent segments the molecular structure into a condensed-cyclic core and separate substituent groups, allowing independent optimization of each segment. The core structure provides high current density and luminosity, while the substituents can be adjusted for ease of synthesis, thus resolving the contradiction between performance and manufacturability
Solution Approach 2:
The patent optimizes synthesis parameters by selecting condensed-cyclic compounds with molecular weights in a specific range and controlled substitution patterns. These parameter changes enable efficient synthesis through conventional organic chemistry methods while achieving high current density and luminosity performance
3Loss of energy
If conventional organic compounds are used in the organic layer, then the device structure is straightforward, but the quantum efficiency and luminosity cannot be improved simultaneously
Solution Approach 1:
The patent changes the electronic structure parameters of the organic compound by introducing rigid condensed-cyclic cores with extended conjugation. This increases the radiative recombination rate and improves quantum efficiency, while the molecular design also enhances light outcoupling to achieve high luminosity without sacrificing efficiency
Solution Approach 2:
The patent uses composite molecular structures combining condensed-cyclic cores with electron-donating or electron-withdrawing substituents. This composite design creates favorable electron-hole recombination conditions for high quantum efficiency while the overall molecular architecture optimizes light emission properties for high luminosity
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 use of the condensed-cyclic compound results in an organic light emitting diode with low driving voltage, high current density, high luminosity, and high quantum efficiency, as demonstrated by the manufacturing examples and evaluation results.
Implementation Method 1
holes injected from the anode move to the light emitting layer through the hole transport layer
Implementation Method 2
The holes and electrons, which are carriers, are recombined in the light emitting layer to form excitons
Implementation Method 3
These excitons are changed from an excited state to a ground state, thereby generating light
Data Source
Figure 1
AI summary
The present invention refers to condensed-cyclic compounds and an organic light emitting diode having an organic layer including the same. wherein the substituents are defined as in the claims.