Enhancement of violet and ultraviolet upconversion emissions in Yb3+/Er3+-codoped YF3 nanocrystals

Guofeng Wang, Weiping Qin, Jisen Zhang, Jishuang Zhang, Yan Wang, Chunyan Cao, Lili Wang, Guodong Wei, Peifen Zhu, Ryongjin Kim

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Pumped with a 980-nm diode laser, violet/ultraviolet upconversion fluorescence was presented in Y0.83Yb0.15Er0.02F3 nanocrystals. Observed emissions at 318 nm and 379 nm were affirmed coming from a four-photon excitation process. In comparison with a bulk sample having the same chemical compositions, the nanocrystals had a markedly enhanced ability of emitting violet/ultraviolet upconversion fluorescence. By employing Tm3+ ions as structural probes in the samples, we found that the enhancement could be attributed to the decrease of Judd-Ofelt parameter Ω2. A model for revealing the four-photon excitation process was proposed based on spectral analysis.

Original languageEnglish
Pages (from-to)296-299
Number of pages4
JournalOptical Materials
Volume31
Issue number2
DOIs
StatePublished - 2008
Externally publishedYes

Keywords

  • Judd-Ofelt parameter
  • Microwave irradiation
  • Nanocrystals
  • Upconversion

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