Sensitized high-order ultraviolet upconversion emissions of Gd3+ by Er3+ in NaYF4 microcrystals

Kezhi Zheng, Dan Zhao, Daisheng Zhang, Ning Liu, Feng Shi, Weiping Qin

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

High-order ultraviolet (UV) upconversion (UC) emissions of Gd3+ and Er3+ ions were observed in NaYF4:Yb 3+/Gd3+/Er3+ microcrystals under 980 nm excitation. These UC emissions came from six- and five-photon UC processes at low pump power range, which were confirmed by the pumping power dependences of UC fluorescence intensities. In these high-order UC processes, energy transfer (ET) processes of Er3+ → Gd3+ played crucial roles in populating the excited states of Gd3+ ions. Experiments on concentration variation and dynamic analysis revealed the ET processes between Er3+ and Gd3+ in detail. Some of possible population routes for populating excited Gd3+ ions were proposed based on spectral and dynamic analysis.

Original languageEnglish
Pages (from-to)5848-5852
Number of pages5
JournalJournal of Alloys and Compounds
Volume509
Issue number19
DOIs
StatePublished - 12 May 2011
Externally publishedYes

Keywords

  • High-order
  • Ultraviolet
  • Upconversion luminescence

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