Near-infrared benzothiadiazole dye-sensitized up-conversion luminescent probe and preparation method thereof

By combining near-infrared benzothiadiazole dyes with lanthanide ion-doped NaYF4-based upconversion nanoparticles, the problems of photostability and luminescence intensity of near-infrared dye-sensitized rare-earth upconversion luminescent probes were solved, achieving high-intensity and high-stability luminescence effects.

CN122255986APending Publication Date: 2026-06-23NANJING TECH UNIV
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Patent Information

Application Number
CN202411899720.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing near-infrared dye-sensitized rare-earth upconversion luminescent probes have poor photostability and insufficient luminescence intensity, and commonly used organic dyes have poor photostability and severe luminescence quenching.

Method used

By combining near-infrared benzothiadiazole dyes with donor-acceptor-donor (DAD) structures with lanthanide ion Ln3+-doped NaYF4-based upconversion nanoparticles, high luminescence intensity and high photostability are achieved through the energy transfer pathway of benzothiadiazole dye → Yb → Ln, avoiding complex core-shell structures.

Benefits of technology

Under an 808nm excitation source of 197W/cm2, the upconversion emission spectrum is enhanced by 42 times, the luminescence intensity is significantly improved, the photostability is good, and the luminescence intensity remains above 90% under long-term light irradiation.

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Abstract

The invention discloses a near-infrared benzothiadiazole dye sensitized rare earth up-conversion luminescence nano probe and a preparation method thereof. The probe is composed of a near-infrared benzothiadiazole dye and up-conversion nanoparticles, and the benzothiadiazole dye is compounded with the up-conversion nanoparticles doped with lanthanide ions without ligands, so that up-conversion luminescence enhancement is realized. The preparation method is simple, a complex core-shell structure and an energy migration process are not involved, the benzothiadiazole dye and the ligand-free rare earth nanoparticles are directly compounded to form the up-conversion luminescent nano-probe, and the up-conversion luminescent nano-probe can be used for up-conversion luminescence under the irradiation of 808nm laser. The emission spectrum of the benzothiadiazole dye is overlapped with the absorption spectrum of sensitizer ions in the up-conversion nanoparticles, so that the up-conversion luminescence intensity of the nanoprobe can be effectively enhanced, good light stability is kept, and the initial luminescence intensity is kept above 90% under the irradiation of exciting light for 120 minutes.
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