Abstract

The upconversion fluorescence is an interest subject for many applications. But very few papers study the high sensitivity upconversion fluorescence and its application to analytical chemistry. The laser excited high sensitive upconversion fluorescence of Y_bF₃ contain with trace${\text{T}}_{\text{m}}^{3+}{\text{ and E}}_{\text{r}}^{3+}$reported here for first time to our knowledge. Also high sensitive upconversion fluorescence of${\text{CaF}}_2:{\text{Y}}_{\text{b}}^{3+}$contain with trace${\text{T}}_{\text{m}}^{3+}{\text{ and E}}_{\text{r}}^{3+}$as impurities were studied.

© 1990 Optical Society of America