Copolymer Long-Persistent Luminescence Without Phase Separation
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Solution Overview
Problem
Existing organic long-persistent luminescent materials face challenges in achieving uniformity due to phase separation and aggregation of electron donor and acceptor molecules, leading to difficulties in producing a single kind of component with long-persistent luminescence emission.
Innovation Solution
A polymer is developed through the polymerization of electron donor and acceptor molecules in specific ratios, allowing for long-persistent luminescence emission with power law decay, where the polymer contains either 70 mol% electron donor and less than 30 mol% electron acceptor, or vice versa, facilitating electron transfer and emission after light irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electron donor and acceptor molecules are mixed to create organic long-persistent luminescent material, then the material does not contain rare earth elements and can be prepared by simple mixing method, but the molecules may aggregate to form lumps or undergo phase separation making uniform material difficult to produce
Solution Approach 1:
The patent merges electron donor and acceptor molecules into a single copolymer structure through polymerization. The copolymer contains both donor units (70-95 mol%) and acceptor units (5-30 mol%) covalently bonded in the same polymer chain, eliminating the need for physical mixing while ensuring uniform distribution and preventing phase separation.
Solution Approach 2:
The patent creates a composite copolymer material combining electron donor and acceptor functional units within a single polymer framework. This composite structure integrates the benefits of both donor and acceptor molecules while maintaining structural uniformity and preventing aggregation through controlled polymerization.
2Duration of action of moving object
If inorganic salts containing rare earth elements are used as long-persistent luminescent materials, then long-lived luminescence is achieved, but the materials contain rare earth elements, require high-temperature process, and are insoluble in solvent
Solution Approach 1:
The patent changes the fundamental chemical composition from inorganic rare earth salts to organic copolymer structures. This parameter change enables luminescence duration of 0.1 seconds or longer without requiring rare earth elements, high-temperature processing, or special solubility conditions, thereby simplifying the overall device complexity.
Solution Approach 2:
The patent replaces expensive rare earth elements with abundant organic molecular components that can be synthesized through simple polymerization. The copolymer structure achieves comparable or superior luminescence duration without the need for costly rare earth materials and complex high-temperature manufacturing processes.
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 polymer-based luminescent material achieves long-persistent luminescence emission of 0.1 seconds or longer with a single kind of polymer, enabling easy production of organic long-persistent luminescent devices.
Implementation Method 1
an electron transfer from the electron donor structural unit to the electron acceptor structural unit occurs by light irradiation to the emitter
Implementation Method 2
Long-persistent luminescent materials are luminescent materials which store energy during application of excitation light and emit light using the stored energy even after the application of excitation light has stopped
Data Source
AI summary
A long-persistent luminescence emitter containing a polymer that contains, relative to the total molar amount of an electron donor structural unit and an electron acceptor structural unit therein, 70 mol % or more of an electron donor structural unit and less than 30 mol % of an electron acceptor structural unit, or containing a polymer that contains, relative to the total molar amount of an electron donor structural unit and an electron acceptor structural unit therein. 70 mol % or more of an electron acceptor structural unit and less than 30 mol % of an electron donor structural unit. The emission decay after stopping light irradiation to the emitter is power law decay.