Organic Compound Interlayer for Low-Voltage, Efficient Light-Emitting Devices
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving low driving voltage, high luminescence efficiency, and long lifespan, particularly due to limitations in the properties of organic compounds used in the interlayer.
Innovation Solution
Incorporating an organic compound represented by Formula 1 in the interlayer of a light-emitting device, which includes a C3-C60 carbocyclic or C1-C60 heterocyclic group with specific substituents, enhances charge transport ability and reduces refractive index, thereby improving device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional organic compounds are used in the interlayer, then the device can operate, but the driving voltage is high and luminescence efficiency is low
Solution Approach 1:
The patent modifies the molecular structure of organic compounds by changing physical and chemical parameters - specifically introducing carbocyclic or heterocyclic groups with specific substituents (R1-R18) to alter charge transport properties and refractive index, thereby achieving low driving voltage and high luminescence efficiency simultaneously
Solution Approach 2:
The patent creates composite organic compounds combining different functional groups (carbocyclic groups, heterocyclic groups, and various substituents) to achieve synergistic effects that simultaneously improve charge transport ability and reduce refractive index, resolving the contradiction between power consumption and luminescence efficiency
2Duration of action of stationary object
If conventional organic compounds are used in the interlayer, then the device can operate, but the lifespan is short
Solution Approach 1:
The patent changes the chemical stability parameters of organic compounds by introducing robust carbocyclic and heterocyclic structures with specific substituents, which enhance electrical stability and extend device lifespan while maintaining operational reliability
3Speed
If organic compounds with high charge transport ability are used, then carrier transport improves, but refractive index increases reducing light extraction efficiency
Solution Approach 1:
The patent precisely adjusts the refractive index parameter by selecting specific carbocyclic or heterocyclic groups with appropriate substituents, achieving a balance where charge transport ability is enhanced while refractive index remains optimized for light extraction efficiency
Solution Approach 2:
The patent applies different functional groups to specific positions in the molecular structure - carbocyclic or heterocyclic groups for charge transport and specific substituents for refractive index control - creating local functional differentiation that simultaneously satisfies both charge transport and light extraction requirements
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 organic compound in the interlayer results in low driving voltage, high luminescence efficiency, and extended lifespan of the light-emitting device.
Implementation Method 1
Holes injected from the first electrode may move toward the emission layer through the hole transport region. Electrons injected from the second electrode may move toward the emission layer through the electron transport region.
Implementation Method 2
novel organic compounds with low refractive index, electrical stability, and high charge transport ability
Implementation Method 3
Carriers, such as holes and electrons, may combine in the emission layer to produce excitons. When the excitons drop (relax) from an excited state to a ground state, light may be generated thereby
Data Source
AI summary
A light-emitting device including a first electrode, a second electrode opposite to (e.g., facing) the first electrode, and an interlayer between the first electrode and the second electrode is provided. The interlayer includes an emission layer, and an organic compound represented by Formula 1.