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author:

Lai, Wen-Bin (Lai, Wen-Bin.) [1] | Zhou, Hai-Fang (Zhou, Hai-Fang.) [2] (Scholars:周海芳) | Cheng, Shu-Ying (Cheng, Shu-Ying.) [3] (Scholars:程树英) | Lai, Yun-Feng (Lai, Yun-Feng.) [4] (Scholars:赖云锋)

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Abstract:

KLaF4 nanocrystals (NCs) co-doped with 2%Er3+(fixed) and varied Yb3+ doping mole fractions (10%, 14%, 18%) were synthesized by hydrothermal method. The samples were annealed in argon at 300°C for 1.5 h. The crystal structure and morphology of the samples were confirmed by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The optical properties of the samples were evaluated by diffuse reflectance spectra and up-conversion photoluminescence spectroscopy with the average fluorescent lifetimes of 2H11/2 level under laser excitation at 980 nm. The results show hexagonal KLaF4: Er3+, Yb3+ NCs are successfully obtained, which have a longitude of about 130 nm and a diameter of 28 nm for the annealed sample. The diffuse reflection spectra indicate that the absorbtion at around 973 nm is enhanced with the increase of Yb3+ mole fraction while Er3+ mole fraction is fixed. The near-infrared light at 980 nm can be up-converted to green and red light. Furthermore, both the intensities of the red and green light and the average fluorescence lifetimes for 2H11/2 level were decreased with the increase of Yb3+ ion concentration in KLaF4: Er3+, Yb3+ NCs. In addition, the effect of Yb3+ doping concertration on the intensity of up-conversion luminescence and the average fluorescence lifetimes for 2H11/2 level were briefly clarified.

Keyword:

Crystal structure Erbium compounds Fluorescence High resolution transmission electron microscopy Infrared devices Lanthanum compounds Laser excitation Light Nanocrystals Optical properties Photoluminescence spectroscopy Ytterbium compounds

Community:

  • [ 1 ] [Lai, Wen-Bin]Institute of Mico-Nano Devices and Solar Cells, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350002, China
  • [ 2 ] [Zhou, Hai-Fang]Institute of Mico-Nano Devices and Solar Cells, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350002, China
  • [ 3 ] [Cheng, Shu-Ying]Institute of Mico-Nano Devices and Solar Cells, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350002, China
  • [ 4 ] [Lai, Yun-Feng]Institute of Mico-Nano Devices and Solar Cells, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350002, China

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Source :

Chinese Journal of Luminescence

ISSN: 1000-7032

CN: 22-1116/O4

Year: 2013

Issue: 10

Volume: 34

Page: 1259-1263

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 2

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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