Synthesis and upconversion luminescence properties of NaYF4:Yb3+/Er3+ microspheres

Guofeng WANG, Weiping QIN, Lili WANG, Guodong WEI, Peifen ZHU, Daisheng ZHANG, Fuheng DING

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Cubic NaYF4:Yb3+(20%)/Er3+(1%) microspheres were synthesized by EDTA-assisted hydrothermal method. Under 980 nm excitation, ultraviolet (4G11/24I15/2), violet (2H9/24I15/2), green (4F7/24I15/2, 2H11/24I15/2, and 4S3/24I15/2), and red (4F9/24I15/2) upconversion fluorescence were observed. The number of laser photons absorbed in one upconversion excitation process, n, was determined to be 3.89, 1.61, 2.55, and 1.09 for the ultraviolet, violet, green, and red emissions, respectively. Obviously, n=3.89 indicated that a four-photon process was involved in populating the 4G11/2 state, and n=2.55 indicated that a three-photon process was involved in populating the 4F7/2/2H11/2/4S3/2 levels. For the violet and red emissions, the population of the states 2H9/2 and 4F9/2 separately came from three-photon and two-photon processes. The decrease of n was well explained by the mechanism of competition between linear decay and upconversion processes for the depletion of the intermediate excited states.

Original languageEnglish
Pages (from-to)394-397
Number of pages4
JournalJournal of Rare Earths
Volume27
Issue number3
DOIs
StatePublished - Jun 2009
Externally publishedYes

Keywords

  • NaYF:Yb/Er
  • hydrothermal method
  • rare earths
  • upconversion luminescence

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