NIR upconversion luminescence of NaYF4:Yb3+, Tm3+/CdSe nanoheterostructures

Guang Hui He, Xue Qing Bi, Wei Ye Song, Wei Hua Di, Wei Ping Qin

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2 Scopus citations


NaYF4:Yb3+, Tm3+/CdSe nanoheterostructures with NIR-to-NIR upconversion luminescence were synthesized by a two-step improved wet-chemical method. X-ray diffraction (XRD) characterization shows that the nanoheterostructures are composed of both pure hexagonal phase NaYF4:Yb3+, Tm3+ and wurtzite phase CdSe. Upconversion emission spectra under the excitation of 980 nm near-infrared laser show that 797 nm emission from Tm3+ ions has been enhanced greatly, while neither ultraviolet nor blue emissions of Tm3+ appear compared with that of pure NaYF4:Yb3+, Tm3+. It indicates that the energy transfer occurs between NaYF4:Yb3+, Tm3+ and CdSe. Under 980 nm excitation, the energy absorbed by Yb3+ ions transfers to Tm3+ ions, then transfers to CdSe partially, and finally the excited CdSe returns the energy back to the corresponding energy levels of Tm3+. These processes lead to the quenching of UV and blue emissions and the enhancement of 797 nm emission of Tm3+ ions in the NaYF4:Yb3+, Tm3+/CdSe nanoheterostructures. The excitation (980 nm) and emission (797 nm) are both located in the NIR spectral range (700-1100 nm) that is referred as the “optical window” of biological tissues because of the minimum of light scattering and autofluorescence of tissue and a relatively large penetration depth. Therefore, the present NaYF4:Yb3+, Tm3+/CdSe nanoheterostructures could have potential applications in biology and biomedicine fields.

Original languageEnglish
Pages (from-to)491-496
Number of pages6
JournalChinese Journal of Luminescence
Issue number5
StatePublished - 1 May 2015
Externally publishedYes


  • CdSe
  • Energy transfer
  • NaYF:Yb, Tm
  • Nanoheterostructures
  • Upconversion luminescence


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