Intense ultraviolet upconversion luminescence from hexagonal NaYF 4:Yb3+/Tm3+ microcrystals

Guofeng Wang, Weiping Qin, Lili Wang, Guodong Wei, Peifen Zhu, Ryongjin Kim

Research output: Contribution to journalArticlepeer-review

199 Scopus citations


Under 980 nm excitation, unusual 3P23H6 (∼264 nm) and 3P23F4 (∼309 nm) emissions from Tm3+ ions were observed in hexagonal NaYF4:Yb3+(20%)/Tm 3+(1.5%) microcrystals. In comparison with the strong emissions from 1D2 and 1I6, the emissions from 1G4 and 3H4 almost vanished due to the efficient cross-relaxation of 1G4 + 3H 43F4 + 1D2 (Tm3+). Double logarithmic plots of the upconversion emission intensity versus the excitation power are neither straight lines nor typical saturation curves. Theoretical analysis indicated that the complicated dependent relationships were mainly caused by phonon-assisted energy transfers and nonradiative relaxation.

Original languageEnglish
Pages (from-to)11907-11914
Number of pages8
JournalOptics Express
Issue number16
StatePublished - 4 Aug 2008
Externally publishedYes


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