Flux growth of highly crystalline NaYF4:Ln (Ln = Yb, Er, Tm) crystals with upconversion fluorescence

Katsuya Teshima, Sunhyung Lee, Nobutaka Shikine, Toshiko Wakabayashi, Kunio Yubuta, Toetsu Shishido, Shuji Oishi

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

Highly crystalline, NaYF4 and NaYF4:Ln (Ln = Yb, Er, Tm) crystals with upconversion fluorescence were successfully grown by the cooling of the solo NaF flux at a holding temperature of 1100 °C and cooling rate of 5 °C·h-1. The basic forms of NaYF4 and NaYF4:Ln crystals were a sphere. The crystal system, form, and size were affected by cooling rate. The red, green, and blue upconversion fluorescence of NaYF4:Ln crystals were clearly observed under 980 nm laser irradiation by a two- or three-photon upconversion process. The upconversion fluorescence of NaYF4:Ln crystals was successfully controlled by changing the cooling rate and type of dopant. Furthermore, the NaYF4:Yb,Er crystals were successfully grown using a mixed NaF-KF flux cooling method at a relatively low temperature of 800 °C.(Figure Presented)

Original languageEnglish
Pages (from-to)995-999
Number of pages5
JournalCrystal Growth and Design
Volume11
Issue number4
DOIs
Publication statusPublished - 2011 Apr 6

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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