Upconversion luminescence properties of Yb 3+, Gd 3+, and Tm 3+ Co-Doped NaYF 4 microcrystals synthesized by the hydrothermal method

Kezhi Zheng, Weiping Qin, Guofeng Wang, Guodong Wei, Daisheng Zhang, Lili Wang, Ryonginjin Kim, Ning Liu, Fuheng Ding, Xiaojie Xue, Tao Jiang, Renyuan Yang

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Yb 3+/Gd 3+/Tm 3+ co-doped prism-like NaYF 4 microcrystals were synthesized through a facile ethylene diamine triacetic acid (EDTA)-assisted hydrothermal method. The microcrystals were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), upconversion (UC) emission spectra, and decay curve. After annealing in an argon atmosphere, the microcrystals emitted bright blue and intense ultraviolet (UV) light under a 980-nm continuous wave diode laser excitation. Besides the UC emissions of the Tm 3+ ions, 6D J, 6I J and 6P J8S 7/2 UC emissions of Gd 3+ were observed. During the emission process of Gd 3+ ions, both Yb 3+ and Tm 3+ ions served as sensitizers. In the complex excitation and frequency UC processes, excited state absorption of Gd 3+ ions, cross relaxation energy transfer (CRET) between two excited Gd 3+ ions, and energy transfer (ET) between Gd 3+ and Yb 3+ or Tm 3+ ions played key roles for the UC emissions of Gd 3+ ions.

Original languageEnglish
Pages (from-to)1920-1923
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume10
Issue number3
DOIs
StatePublished - Mar 2010
Externally publishedYes

Keywords

  • Gd
  • Microcrystals
  • NaYF
  • Upconversion

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