Polycyclic Host Material for OLED Driving Voltage Reduction
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving reduced driving voltage and high efficiency for light emitting elements, necessitating the development of materials that can stabilize these characteristics.
Innovation Solution
A light emitting element incorporating a polycyclic compound represented by Formula 1, which includes a host material with a carbazole, pyridine, pyrimidine, or triazine group, is used to reduce driving voltage and enhance efficiency, with the emission layer potentially being a phosphorescence or thermally activated delayed fluorescence layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional organic electroluminescence materials are used, then the light emitting element can operate, but the driving voltage is high and efficiency is low
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the host material through specific molecular design (Formula 1 with carbazole, pyridine, pyrimidine, or triazine groups). This structural parameter change optimizes the material's electronic properties, resulting in reduced driving voltage and improved efficiency simultaneously
Solution Approach 2:
The patent employs composite materials by creating a host material that combines multiple functional groups (carbazole, pyridine, pyrimidine, or triazine) within a single molecular structure. This composite approach allows the material to exhibit both low driving voltage and high efficiency characteristics that neither component alone could achieve
2Productivity
If the emission layer is designed for high efficiency, then luminous efficiency improves, but charge balance deteriorates
Solution Approach 1:
The patent applies local quality by designing the host material with specific functional groups at particular positions in the molecular structure. The carbazole, pyridine, pyrimidine, or triazine groups are strategically placed to create localized electronic properties that simultaneously enhance luminous efficiency and maintain charge balance in different regions of the emission layer
3Productivity
If operating temperature increases, then device performance improves, but thermal stability decreases
Solution Approach 1:
The patent applies parameter changes by modifying the thermal parameters of the host material through molecular design. The specific structure in Formula 1 with its rigid aromatic groups (carbazole, pyridine, pyrimidine, or triazine) increases the glass transition temperature and thermal stability, allowing the device to operate at higher temperatures without degradation
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 as a host material in the light emitting element results in improved charge balance and luminous efficiency, reducing driving voltage and increasing the thermal stability and efficiency of the light emitting element.
Implementation Method 1
the emission layer potentially being a phosphorescence or thermally activated delayed fluorescence layer
Implementation Method 2
the emission layer potentially being a phosphorescence or thermally activated delayed fluorescence layer
Data Source
AI summary
A light emitting element that includes a first electrode, a second electrode facing the first electrode, and an emission layer between the first electrode and the second electrode is provided. The emission layer includes a polycyclic compound represented by Formula 1. The light emitting element has a reduced driving voltage and an increased efficiency.