Polycyclic Compound Host for OLED Driving Voltage Reduction
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in reducing driving voltage and enhancing emission efficiency and lifetime of light emitting elements.
Innovation Solution
Incorporation of a polycyclic compound represented by Formula 1 in the light emitting element, specifically in the emission layer and electron transport region, which includes a nitrogen-containing ring bonded to an indolocarbazole skeleton, to improve bipolar properties and reduce interaction with dopants, thereby reducing driving voltage and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional materials are used in the emission layer and electron transport region, then the device structure is simple, but the driving voltage is high and emission efficiency is low
Solution Approach 1:
The patent modifies the chemical structure parameters of the host material by introducing a nitrogen-containing ring bonded to an indolocarbazole skeleton, creating a polycyclic compound with optimized electronic properties. This structural parameter change enables reduced driving voltage while maintaining device simplicity
Solution Approach 2:
The invention uses a composite material system where the polycyclic compound serves as the host material in the emission layer and electron transport region. This composite approach combines the nitrogen-containing ring with the indolocarbazole skeleton to achieve synergistic effects that reduce driving voltage and improve emission efficiency
2Productivity
If conventional materials are used in the light emitting element, then the material selection is simple, but the emission efficiency and lifetime are insufficient
Solution Approach 1:
The patent optimizes emission efficiency by changing the molecular parameters of the host material. The polycyclic compound with nitrogen-containing ring bonded to indolocarbazole skeleton provides improved charge transport and recombination properties, enhancing emission efficiency while managing structural complexity
Solution Approach 2:
The invention applies local quality improvement by specifically targeting the electron transport region and emission layer with the polycyclic compound. The nitrogen-containing ring and indolocarbazole skeleton provide localized electronic properties that enhance emission efficiency where needed most
3Duration of action of stationary object
If conventional materials are used, then the device manufacturing is simple, but the lifetime of the light emitting element is insufficient
Solution Approach 1:
The patent extends light emitting element lifetime by changing the chemical stability parameters of the host material. The polycyclic compound structure with nitrogen-containing ring bonded to indolocarbazole skeleton provides improved molecular stability and resistance to degradation, enhancing device lifetime
Solution Approach 2:
The invention replaces conventional short-lived materials with the more stable polycyclic compound. While the compound structure is more complex, it provides extended operational lifetime that outweighs the increased material 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 use of the polycyclic compound leads to improved driving voltage properties and emission efficiency, enabling the light emitting element to emit light with a central wavelength of about 430 nm to 480 nm, effectively enhancing the performance of the organic electroluminescence display device.
Implementation Method 1
organic electroluminescence display device in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer so that a light emitting material in the emission layer emits light
Data Source
AI summary
A light emitting element that includes a first electrode, a second electrode on the first electrode, and at least one functional layer between the first electrode and the second electrode is provided. The at least one functional layer includes a polycyclic compound represented by a specific chemical structure, and has a high efficiency and low driving voltage properties.