The up-conversion luminescence properties of Er-Yb codoped new fluoride ceramic and glass were studied.Intense violet

green and red up-conversion emissions were observed with 978nm LD as an excitation source.In comparison with the up-conversion spectrum of Yb-Er codoped systems reported previously

the violet and red emissions in our sample were enhanced greatly.The up-conversion emission spectra of ZAPL:10% Yb

3+

5% Er

3+

glass and ceramic excited by 978nm LD laser were measured.The up-conversion emission spectra under different excitation densities for oxide-fluoride

glass(10% Yb

3% Er)and fluoride glass and ceramic(10% Yb

5% Er)were also presented in this paper.In order to clarify the enhancement mechanism

the excitation spectra with different wavelength were measured.The experimental results indicate that two cross-relaxation processes between Yb and Er:

4

G

11/2

→4

F

9/2

(Er

3+

)and

2

F

7/2

→2

F

5/2

(Yb

3+

)

2

H

9/2

→4

F

9/2

(Er

3+

)and

2

F

7/2

→2

F

5/2

(Yb

3+

)make the red up-conversion emissions enhanced greatly.The enhancement of violet emission is attributed to the low energy and narrow band phonon in our sample.We explain up-conversion fluorescence properties of Er-Yb co-doped oxide-fluoride vitro-ceramic excited by 978nm LD at the end.