At room temperature

there are two emission peaks in the luminescence spectrum of LiBaF

3

:Eu

2+

powder sample. One is a broad band peaked at 410nm

and the other one is a narrow band peaked at 360nm

corresponding to 5d-4f and 4f-4f transitions of Eu

2+

respectively. Furthermore

taking the reflection spectrum of Au thin film as reference

the reflection spectra of LiBaF

3

:Eu

2+

sample are measured in the range of 50~400nm at U10B station of the National Synchrotron Radiation Laboratory (NSRL). The absorption spectra are calculated from the reflection spectrum by using the Kramers-Kronig relation. It is found that the energy gap

E

g

of this material is about 12.1eV. We believe that in the absorption spectra of LiBaF

3

:Eu

2+

the 53.4

59.4

65.3

69.2 and 76.5nm sub-bands correspond to transitions between core levels of Ba

2+

5p and F

-

2p electrons

respectively. Then the 183.4nm sub-band is attributed to the intrinsic defects absorption.On the other hand

without the pre-irradiation

one can observe the luminescence of LiBaF

3

:Eu

2+

powder sample under the excitation of wavelength longer than 450nm. It means that the LiBaF

3

:Eu

2+

sample has the photo-stimulated character.