Upconversion emissions from high-energy states of Eu3+ sensitized by Yb3+ and Ho3+ in β-NaYF4 microcrystals under 980 nm excitation

Lili Wang, Zhenyu Liu, Zhe Chen, Dan Zhao, Guanshi Qin, Weiping Qin

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33 Scopus citations

Abstract

Under 980 nm excitation, multiple ultraviolet and visible upconversion luminescence from Ho3+ and Eu3+ ions were observed in Yb3+/Ho3+/Eu3+ tri-doped NaYF4 microcrystals (MCs). The high-energy states (5H3-7, 5L6, 5D3 and 5D 2) of Eu3+ ions could be efficiently populated by two-step energy transfer (ET) processes of Yb → Ho → Eu. Four-, three-, two-photon UC processes of Eu3+ ions were confirmed by the dependence of 5H3-7, 5L6 and 5D0 levels emission intensities on the pumping power.

Original languageEnglish
Pages (from-to)25471-25478
Number of pages8
JournalOptics Express
Volume19
Issue number25
DOIs
StatePublished - 5 Dec 2011
Externally publishedYes

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