Polycyclic Compound Emission Layer for OLED Service Life
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high luminous efficiency, and long service life for light emitting elements.
Innovation Solution
A polycyclic compound represented by specific formulas is used in the emission layer of a light emitting element, comprising aryl or heteroaryl rings with nitrogen-containing polycyclic groups, which enhances the service life and efficiency of the light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional organic electroluminescence materials are used, then the light emitting element can operate and emit light, but the service life is limited and luminous efficiency is insufficient
Solution Approach 1:
The patent modifies the chemical structure of organic electroluminescence materials by introducing specific polycyclic compound structures with nitrogen-containing groups (such as triazole, tetrazole, pyrazole rings) and adjusting molecular weight and structural parameters. These parameter changes in the material composition lead to improved service life and luminous efficiency of the light emitting element
Solution Approach 2:
The patent employs composite organic electroluminescence materials comprising multiple components including polycyclic compounds as main emitters, host materials (such as mCP, TCTA, BCP), and doping materials. This composite material system synergistically improves both service life and luminous efficiency, resolving the contradiction between durability and performance
2Productivity
If the light emitting element operates at high luminous efficiency, then more light is emitted, but the driving voltage increases
Solution Approach 1:
The patent optimizes the energy level parameters (HOMO/LUMO levels) and molecular weight parameters of the organic electroluminescence materials to achieve better charge injection and transport. This parameter optimization enables high luminous efficiency operation at reduced driving voltages, resolving the energy efficiency contradiction
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 polycyclic compound improves the service life and luminous efficiency of the light emitting element, enabling stable operation with reduced driving voltage.
Implementation Method 1
a so-called self-luminescent light emitting element in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and thus a luminescent material of the emission layer emits light
Data Source
AI summary
A light emitting element includes a first electrode, a second electrode, and an emission layer between the first electrode and the second electrode and includes a compound represented by Formula 1 below, thereby exhibiting a long service life characteristic.