OLED Emissive Compound Structure for Delayed Fluorescence Efficiency
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face limitations in luminous efficiency, color purity, and luminous lifespan due to the use of common fluorescent and phosphorescent materials, particularly metal complexes with short luminous lifespan.
Innovation Solution
An organic compound with a specific molecular structure (Formula 1) incorporating an electron donor and acceptor moiety, allowing for delayed fluorescence and reduced energy bandgap, is used in the emissive layer of OLEDs, enhancing luminous efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common fluorescent materials are used in OLEDs, then the device structure is simple, but the luminous efficiency is low because only singlet excitons are involved in luminescence
Solution Approach 1:
The patent changes the energy level parameters of the organic compound by designing specific molecular structures with different HOMO and LUMO energy levels. This allows the material to achieve delayed fluorescence with 100% internal quantum efficiency while maintaining device structure simplicity
Solution Approach 2:
The patent uses composite organic compounds combining electron donor and acceptor moieties in specific molecular structures (Formulas 1-4). This composite structure enables delayed fluorescence mechanism while keeping the device structure relatively simple
2Use of energy by moving object
If metal complex phosphorescent materials are used in OLEDs, then the luminous efficiency is high because both singlet and triplet excitons are involved, but the luminous lifespan is too short for commercial application
Solution Approach 1:
The patent extracts the metal complex from the phosphorescent material system, developing purely organic compounds that exhibit delayed fluorescence. This removes the metal component causing short lifespan while maintaining high luminous efficiency through organic molecular design
Solution Approach 2:
The patent changes the material composition parameter from metal-containing phosphorescent materials to metal-free organic compounds with specific molecular structures. This achieves both high luminous efficiency and extended luminous lifespan suitable for commercial applications
3Use of energy by moving object
If common phosphorescent materials are used in OLEDs, then the luminous efficiency is improved, but the color purity is insufficient
Solution Approach 1:
The patent applies local quality by designing specific molecular structures (Formulas 1-4) with particular electron donor and acceptor moieties arranged in specific positions. This localized structural design enables both high luminous efficiency and improved color purity
Solution Approach 2:
The patent uses composite organic materials with specifically designed molecular structures combining electron donor and acceptor units. This composite structure achieves delayed fluorescence with 100% internal quantum efficiency and improved color purity
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 organic compound achieves 100% internal quantum efficiency through delayed fluorescence and high color purity, with improved luminous lifespan and reduced energy loss, minimizing the need for high-triplet energy level hosts and dopants.
Implementation Method 1
An organic compound having excellent luminous properties... achieves 100% internal quantum efficiency through delayed fluorescence
Implementation Method 2
incorporating an electron donor and acceptor moiety, allowing for delayed fluorescence and reduced energy bandgap
Implementation Method 3
reduced energy bandgap... reduced energy loss
Implementation Method 4
holes injected from an anode and electrons injected from a cathode are recombined in an EML to form excitons as an unstable excites state, and then the light emits as the exciton is shifted to a stable ground state
Data Source
AI summary
The present disclosure relates to an organic compound in which an electron acceptor moiety and an electron donor moiety of a fused aromatic ring or a hetero aromatic ring are directly linked or through an linker moiety and they are connected via carbon-carbon bond, and an organic light emitting diode (OLED) and an organic light emitting device including the organic compound. The organic compound includes both the electron acceptor and donor moieties that are linked directly or through a linker moiety via a carbon-carbon bond having strong bond energy within its molecule, thus charges can be transported easily within the molecule. The OLED and the organic light emitting device including the organic compound in an emissive layer can implement excellent luminous efficiency and luminous lifespan.