Synthesis and upconversion luminescence of uniform β-NaYF 4:Yb 3+/Tm 3+ hexagonal nanoplates

Qijun Tian, Ning Liu, Guanshi Qin, Kezhi Zheng, Daisheng Zhang, Weiping Qin

Research output: Contribution to journalArticlepeer-review

Abstract

Yb 3+ and Tm 3+-codoped hexagonal-phase NaYF 4 powders were prepared by a facile hydrothermal method. The results of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) showed that the as-prepared powders were well crystallized nanoplates with high sizeuniformity. Under the excitation from a 980 nm laser diode, upconversion (UC) emissions centered at ∼291 nm ( 1I 63H 6), ∼346 nm ( 1I 63F 4), ∼361 nm ( 1D 23H),∼451 nm ( 1D 23F 4),∼474 nm ( 1G 43H 4),∼644 nm ( 1G 43F 4), and ∼799 nm ( 3H 43H 6) were observed in the sample. Furthermore, the intensity dependence of UC emissions on excitation power was measured. The results indicated that populating the 1I 6, 1D 2, 1G 4, and 3Prof. 4 states were five-photon, four-photon, three-photon, and two-photon UC processes, respectively.

Original languageEnglish
Pages (from-to)9576-9579
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume11
Issue number11
DOIs
Publication statusPublished - 2011
Externally publishedYes

Keywords

  • Hexagonal NaYF
  • Nanoplates
  • Rare Earth Ions
  • Upconversion Luminescence

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