Optical spectroscopy and confocal fluorescence imaging of upconverting Er3+-doped CaF2 nanocrystals

G. A. Kumar, C. W. Chen, R. E. Riman

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Up-conversion emission and confocal fluorescence imaging of Er3+ -doped Ca F2 nanocrystals were investigated using infrared excitation. At Er3+ concentrations less than 2.8 mol %, green emission was dominant while red prevailed at higher concentrations. The simultaneous green and red emission and change in relative intensities is explained with a mechanism utilizing concepts of TPA, ESA, ET, and CR processes.

Original languageEnglish (US)
Article number093123
JournalApplied Physics Letters
Volume90
Issue number9
DOIs
StatePublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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