Solid-state blue and green light sources have many important uses.For example they are desirable for high-density optical storage

color displays

optoelectronics and medical diagnostics.Up to now

the conversion from infrared into visible wavelength has attracted much attention and up-conversion material doped with rare earth ions has been intensively studied on various crystals and glasses.Most oxide glasses are much more chemically and mechanically stable and also are more easily fabricated into various shapes

but their larger phonon energy results in the high inefficient rate of infrared up-conversion.As known to all

fluoride material has lower phonon energy

which is very useful for improving the up-conversion efficiency

whereas due to poor chemical stability

disappointing mechanical strength and low laser damage threshold

all these problems limit its development and application.Nowadays

people are trying preparing up-conversion luminescence material of oxy-fluoride.This type of material possesses both the high up-conversion luminescence efficiency of fluoride material and characters of oxide materials.In this paper

the preparation of glass ceramics doped with Yb

3+

Er

3+

in composition of PbF

2

+GeO

2

+WO

3

+SiO

2

+NaF and the effect of the rare-earth ions on the host material are reported.The emission spectrum was measured under a 980nm laser diode excitation.It shows a strong up-conversion emission peak at 550nm and weak peaks at 528nm and 650nm.The experimental results were discussed and the up-conversion mechanism was established.The spectroscopic properties

the composition of host glass

the preparation parameter

the concentration of rare-earth ion

the dependence of emission intensity on the excitaion power were also discussed.In our experiment we select PbF

2

GeO

2

WO

3

SiO

2

and NaF as host constituents.Pb

3+

and W

6+

both have larger masses; moreover the mass of F

-

is bigger than that of O

2-

.So the host glass bears good transmittance in the near infrared region.Because of smaller bond strength of Ge—O

GeO

2

hardly absorbs near infrared light.Heavy metal fluorides with low phonon energy easily produce transfer course of free radiation.GeO

2

and SiO

2

are both glass formers among the components and useful to generate glass in network structures.Through many experiments we set the annealing temperature at 380℃ and the melting temperature at 950℃.The optimum proportion is of c(Yb

3+

):c(Er

3+

)= 5:1.