Fused Polycyclic Emitters for Low-Voltage OLED Efficiency and Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic electroluminescence devices face challenges in achieving low driving voltage, high luminous efficiency, and long service life, which are essential for advanced display applications.
Innovation Solution
A light emitting device is developed with a specific fused polycyclic compound in the emission layer, where the compound is represented by various formulas, allowing for improved luminous efficiency and service life by controlling the molecular structure and intermolecular interactions, thereby reducing excimer and exciplex formation and Dexter energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic electroluminescence materials are used, then the device can operate, but luminous efficiency and service life are insufficient
Solution Approach 1:
The patent modifies molecular parameters of the organic compound by introducing specific fused polycyclic structures (triphenylene, pyrene, dibenzofuran, dibenzothiophene units) and controlling substitution patterns to optimize both luminous efficiency and service life simultaneously
Solution Approach 2:
The invention creates a composite molecular structure combining multiple heterocyclic units (triphenylene, pyrene, dibenzofuran, dibenzothiophene) with specific substituent groups to achieve synergistic effects that improve both luminous efficiency and device service life
2Use of energy by moving object
If driving voltage is reduced for display applications, then energy consumption decreases, but maintaining high luminous efficiency becomes difficult
Solution Approach 1:
The patent optimizes HOMO-LUMO energy gap parameters through molecular design, achieving low driving voltage (reduced energy consumption) while maintaining high luminous efficiency by controlling electron-hole recombination characteristics
3Productivity
If intermolecular interactions are increased to enhance charge transport, then device performance improves, but excimer and exciplex formation increases reducing luminous efficiency
Solution Approach 1:
The patent introduces bulky substituent groups (tert-butyl, phenyl, naphthyl) at specific positions of the fused polycyclic core to create local steric hindrance, preventing unwanted intermolecular interactions and excimer formation while maintaining necessary charge transport properties
Solution Approach 2:
The invention converts the potential harm of strong intermolecular interactions (which cause excimer formation) into a benefit by designing molecules that utilize controlled intermolecular interactions for charge transport while preventing exciton quenching through steric design
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 fused polycyclic compound enhances luminous efficiency and extends the service life of the light emitting device by suppressing intermolecular interactions and controlling the luminescence wavelength, maintaining optimal electronic and physical properties.
Implementation Method 1
the organic electroluminescence display apparatus is a so-called self-luminescent display apparatus in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and thus, a luminescent material including an organic compound in the emission layer emits light
Implementation Method 2
delayed fluorescence emission which uses the generating phenomenon of singlet excitons by the collision of triplet excitons (triplet-triplet annihilation, TTA)
Implementation Method 3
development of a material for thermally activated delayed fluorescence (TADF) using delayed fluorescence phenomenon
Data Source
AI summary
Provided is a light emitting device including a first electrode, a second electrode facing the first electrode, and an emission layer between the first electrode and the second electrode, wherein the emission layer includes a first compound represented by Formula 1 below: