Thermally Activated Delayed Fluorescent Monomolecular White Light Material
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Solution Overview
Problem
The molecular structure of white light polymer materials is uncertain, leading to poor repeatability in synthesis and low luminous efficacy, which limits their application in organic electroluminescence devices.
Innovation Solution
A thermally activated delayed fluorescent monomolecular white light material is synthesized using a D1-A-D2 structure with asymmetric groups, where D1 and D2 are selected from specific raw materials such as 9,9'-diphenylsilyl acridine, iminoguanidine, 3,6-dimethyl-spirosilane acridine, 3,6-dimethylcarbazole, or phenothiazine, through a method involving mixed solution preparation, extraction, and purification steps with catalysts like palladium acetate and tri-tert-butylphosphine tetrafluoroborate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer thermal activation delayed fluorescent materials are used for wet processing, then ease of manufacture is improved, but manufacturing precision deteriorates due to inability to maintain high photoluminescence quantum yield and large reverse intersystem enthalpy constant
Solution Approach 1:
The invention segments the polymer structure into distinct functional units: a core structure with specific photophysical properties and pendant groups containing luminescent objects. This segmentation allows each component to be optimized independently while maintaining overall performance, enabling wet processing without sacrificing photoluminescence quantum yield.
Solution Approach 2:
The invention changes key parameters by designing a polymer with controlled molecular weight, specific pendant group composition, and regulated crosslinking density. These parameter changes enable the material to maintain high photoluminescence quantum yield and large reverse intersystem enthalpy constant while being suitable for wet processing techniques.
2Stability of the object's composition
If white light polymer luminescent materials with side chains linking luminescent objects are used, then phase separation is avoided, but molecular structure uncertainty and poor synthesis repeatability occur
Solution Approach 1:
The invention applies local quality by designing specific pendant groups with defined chemical structures and luminescent properties attached to a standardized core. This localized functionalization ensures uniform distribution of luminescent objects while maintaining consistent molecular structure across batches, improving synthesis repeatability without causing phase separation.
Solution Approach 2:
The invention creates a composite polymer structure combining a stable core framework with functional pendant groups containing luminescent objects. This composite approach ensures both phase separation resistance through the crosslinked network and synthesis repeatability through well-defined molecular architecture with controlled composition and structure.
3Ease of manufacture
If conventional small molecule white light doping devices are fabricated by physical doping, then ease of manufacture is improved, but device performance deteriorates due to phase separation and charge transfer complex formation
Solution Approach 1:
The invention merges the luminescent functionality directly into the polymer chain structure through pendant groups, eliminating the need for separate doping components. This integration prevents phase separation and charge transfer complex formation while maintaining ease of manufacture through single-material processing, thereby improving device performance without sacrificing fabrication simplicity.
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 synthesized material achieves high white light luminescent properties and improved synthesis rates, resulting in an organic electroluminescent device with high luminous efficacy and long service life.
Implementation Method 1
a thermally activated delayed fluorescent monomolecular white light material
Implementation Method 2
A phosphorescent material has a spin-or-coupling effect of heavy atoms, and can simultaneously utilize single-excited excitons and triple-excited excitons
Implementation Method 3
through a method involving mixed solution preparation, extraction, and purification steps with catalysts like palladium acetate and tri-tert-butylphosphine tetrafluoroborate
Data Source
AI summary
A thermally activated delayed fluorescent monomolecular white light material, a method of synthesizing thereof, and an organic electroluminescent device. The material includes a raw material containing a first group, a raw material containing a second group, and 3,3′-dibromo-1,5,1′,5′-tetramethyl-1,2,4,5-homotetradecene. The thermally activated delayed fluorescent monomolecular white light material synthesis method comprises: a first mixed solution preparation step, a first extraction step, a second mixed solution preparation step, and a second extraction step. A light emitting layer of the organic electroluminescent device includes the thermally activated delayed fluorescent monomolecular white light material.