期刊
RSC ADVANCES
卷 5, 期 59, 页码 48024-48030出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra07964k
关键词
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资金
- NSFC [51425303, 81301650, 21374042, 21174051, 21221063]
- 973 Program of China [2014CB643503]
- Natural Science Foundation of Jilin Province [20140101048JC]
- Special Project from MOST of China
- Fundamental Research Funds for the Central Universities
Multiplex luminescent probes with good water-dispersibility are basic materials in current biological research as labels and sensors. In this work, we demonstrate a facile approach to fabricate water-dispersible dual-mode luminescent probes by co-assembling down-conversion CdTe nanoparticles (NPs) and up-conversion NaYF4:Yb, Tm(Er) NPs. 3-Mercaptopropionic acid (MPA)-capped CdTe NPs are water soluble, while oleic acid (OA)-capped NaYF4: Yb, Tm(Er) NPs are dispersed in chloroform. There also exists an excess of Cd-MPA complex in the CdTe aqueous solution. After mixing CdTe and NaYF4:Yb, Tm(Er), the MPA on CdTe NPs and Cd-MPA complexes is capable of partially replacing the OA on NaYF4:Yb, Tm(Er) NPs, thus transferring NaYF4:Yb, Tm(Er) NPs to water and forming CdTeNaYF4:Yb, Tm(Er) hybrid NPs. The hybrid NPs combine the down-conversion emission of CdTe and the up-conversion emission of NaYF4:Yb, Tm(Er), which can be excited both by 400 and 980 nm irradiation and exhibit dual-mode emission. Both Forster resonance energy transfer from NaYF4:Yb, Tm(Er) to CdTe and photon re-absorption are observed as the hybrid NPs are excited by 980 nm irradiation.
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