Degradable light conversion film with intrinsic fluorescence and application thereof

By designing chemically bonded biodegradable copolyesters, the problems of easy migration and aggregation quenching of light-converting agents in light-converting films have been solved, achieving stable fluorescence emission and low-cost light-converting performance. It is suitable for agriculture, packaging and optical devices, and meets environmental protection requirements.

CN122234357APending Publication Date: 2026-06-19TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202610697826.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-20
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing biodegradable light-converting films suffer from problems such as easy migration, aggregation and quenching of the light-converting agent, and high cost. Traditional physical blending methods are difficult to achieve stable and efficient fluorescence conversion.

Method used

By designing biodegradable copolyesters with aggregation-induced emission properties, the ratio and sequence structure of rigid conjugated units and flexible spacer units are controlled to form chemically bonded molecular chains. This ensures that there are sufficiently long flexible chain segments separating the rigid conjugated units, thereby achieving intrinsic fluorescence emission, avoiding aggregation quenching, and improving mechanical properties.

Benefits of technology

It achieves high fluorescence stability and low cost in fluorescence conversion performance. The material has stable fluorescence emission in the solid state, tunable fluorescence wavelength and mechanical properties to meet different application needs, and is biodegradable and pollution-free.

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Abstract

This invention belongs to the field of polymer functional materials technology, specifically relating to a biodegradable light-converting film with intrinsic fluorescence and its applications. The biodegradable light-converting film is prepared from a biodegradable copolyester with aggregation-induced emission properties. The biodegradable copolyester is polymerized from a polymerizable monomer, a first monomer providing rigid conjugated units, and a second monomer providing flexible spacer units. In the main chain structure of the biodegradable copolyester, the longest linear spacer segment between any two adjacent rigid conjugated units derived from the first monomer has ≥10 carbon atoms. Through precise molecular structure design, the aggregation-induced emission properties are chemically bonded to the biodegradable polyester main chain, fundamentally solving the problems of easy migration, aggregation quenching, and high cost of the light-converting agent in traditional additive-type light-converting films. This light-converting film exhibits efficient and stable intrinsic fluorescence in the solid state, with tunable fluorescence color, and possesses good mechanical properties and biodegradability.
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Citation Information

Patent Citations

  • Biodegradable light conversion film and preparation method thereof

    CN109251488A

  • Degradable light conversion film as well as preparation method and application thereof

    CN112521738A