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Non-injection and one-pot approach to CdSe: Eu3+ hybrid nanocrystals with tunable photoluminescence from green to red

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Abstract

Europium ion-doped CdSe hybrid nanocrystals (CdSe:Eu3+ NCs) as a class of new luminescent materials have drawn increasing attention in recent years owing to their remarkable optical properties. In this paper, we report a facile method to prepare CdSe:Eu3+ NCs using oleic acid (OA) as the capping agent. With this non-injection and one-pot synthesized approach, the formation and surface passivation of CdSe:Eu3+ NCs are performed simultaneously and result in intrinsic luminescence. The as-prepared CdSe:Eu3+ NCs are characterized by transmission electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy (EDX). Their optical properties are also studied by UV–vis and photoluminescence spectra. Moreover, the effects of feed ratios and reaction temperatures on the optical properties are further investigated. The results show that the luminescent spectra of CdSe:Eu3+ NCs are tunable from green (490 nm) to red (630 nm) and gradually redshift with the increase of the nanoparticle size from 2.5 to 4.4 nm. Upon decoration with 2-thenoyltrifluoroacetone (TTA), the luminescence of europium ion drastically increases and efficient energy transfer from CdSe host to the europium ion is proposed. In addition, an MTT and apoptosis assay show CdSe:Eu3+ NCs have low cellular toxicity and could be used as fluorescence imaging for human epithelial type 2 (Hep-2) cells. These properties make CdSe:Eu3+ NCs a potential candidate for biological labeling, immunoassays, and optical sensing.

Stable and luminescent CdSe:Eu3+ hybrid nanocrystals were synthesized, and the luminescence is tunable from green to red by the variation of reaction temperatures and feed ratios. Moreover, CdSe:Eu3+ NCs show low cellular toxicity and could be used as fluorescence probes for Hep-2 cells.

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Acknowledgements

This work was supported by the Natural Science Foundation of Jilin Province (20140520080JH and 20140520120JH) and the Health Bureau Foundation of Wuxi City, China (MS201524). We also acknowledge the support from Wuxi Center for Disease Control and Prevention, China.

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Authors and Affiliations

  1. Wuxi Center for Disease Control and Prevention, Wuxi, 214023, People’s Republic of China

    Lingcan Kong & Lei Zhou

  2. Jilin Provincial Key Laboratory of Architectural Electricity & Comprehensive Energy Saving, School of Electrical and Electronic Information Engineering, Jilin Jianzhu University, Changchun, 130118, People’s Republic of China

    Xuefeng Chu & Xiaotian Yang

  3. China-Australia Joint Research Centre for Functional Molecular Materials, School of Chemical & Material Engineering, Jiangnan University, Wuxi, 214122, People’s Republic of China

    Chuanxi Wang

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  1. Lingcan Kong
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  2. Xuefeng Chu
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  3. Chuanxi Wang
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  4. Xiaotian Yang
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  5. Lei Zhou
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Correspondence to Lingcan Kong or Chuanxi Wang.

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Kong, L., Chu, X., Wang, C. et al. Non-injection and one-pot approach to CdSe: Eu3+ hybrid nanocrystals with tunable photoluminescence from green to red. J Nanopart Res 19, 20 (2017). https://doi.org/10.1007/s11051-016-3724-3

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