Improved ultraviolet upconversion emissions of Ho3+ in hexagonal NaYF4 microcrystals under 980 nm excitation

Lili Wang, Weiping Qin, Min Lan, Lanlan Sun, Zhenyu Liu, Dan Zhao, Guanshi Qin, Changfeng Wu, Xiaohong Chuai, Weihua Di, Chunfeng He

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Under 980 nm excitation, enhanced ultraviolet (UV) upconversion (UC) emissions at 242.4 nm, 276.1 nm, 289.7 nm, 296.4 nm, 303.6 nm, 357.7 nm and 387.8 nm of Ho3+ ions were observed in β-NaYF 4:20%Yb3+, 1.5%Ho3+ microcrystals (MC) which were synthesized through a hydrothermal method. The results indicated that these UV emissions came from five- and four-photon UC processes. Dynamical analysis on Ho3+ excited states suggests that, for excited Ho3+ ions, the higher the energy level is, the shorter the lifetime is.

Original languageEnglish
Pages (from-to)3490-3493
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume14
Issue number5
DOIs
StatePublished - May 2014
Externally publishedYes

Keywords

  • Ultraviolet
  • Upconversion

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