NDLI: Reduced photon quenching in Ce-doped NaYF 4 : Yb / Ho upconversion nanoparticles with core / shell structure

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Reduced photon quenching in Ce-doped NaYF 4 : Yb / Ho upconversion nanoparticles with core / shell structure

Content Provider	Semantic Scholar
Author	Ye, Shuai Song, Jun Wang, Dong Tian, Yuliang Qu, Junle Niu, Hanben
Copyright Year	2016
Abstract	The use of red light or near-infrared radiation as a luminescent probe for in vivo bio imaging is crucial in order to restrict the strong absorption of short-wavelength light below 600 nm in tissue. It is demonstrated that the emission color of Yb/Ho codoped NaYF4 nanoparticles can be tuned from green to red by incorporating Ce3þ ions. However, compared with that of the NaYF4:Yb∕Ho nanoparticles, the photoluminescence intensity of the Ce3þ-tridoped NaYF4:Yb∕Ho nanoparticles is drastically reduced. In this work, Ce3þ-incorporated core/shell NaYF4: Yb3þ50%@NaYF4:Ho3þ0.5% nanoparticles are prepared. A strong red emission and a high-intensity ratio between the red emission and green emission are obtained in these upconversion nanoparticles. The emission intensity increases by a factor higher than 120 when compared with that of the NaYF4:Yb∕Ho∕Ce nanoparticles. This result indicates that the Ce3þ incorporation into the NaYF4:Yb∕Ho nanoparticles promotes a strong quenching effect and reduces the emission intensity; however, the quenching effect can be significantly reduced by incorporating the Ce3þ ions into the core/shell NaYF4:Yb3þ50%@NaYF4:Ho3þ0.5% nanoparticles. A theoretical model is proposed to explain the presence of the quenching effect in the NaYF4:Yb∕Ho∕Ce nanoparticles, demonstrating that the quenching is mainly related to the interaction between the Yb3þ and Ce3þ ions. OCIS codes: 160.2540, 160.4760. doi: 10.3788/COL201614.021601.
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Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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