BaFBr:Eu

2+

is a kind of photo stimulated luminescence (PSL) material with a wide energy band bigger than 8eV. For BaFBr:Eu

2+

powder samples

without pre irradiation of X-ray

VUV or UV light

the radiative transition of Eu

2+

ion peaked at about 390nm can be observed

even if the excitation wavelength is longer than 400nm. The electron spin resonance (ESR) spectrum reveals that there are both electron and hole-type traps in powder samples

which play an important role in the PSL process of BaFBr:Eu

2+

. The slice of BaFBr:Eu

2+

powder was fabricated under pressure. Two electrodes were evaporated or glued on the surface of slices

so that we can study the electrical properties of BaFBr:Eu

2+

such as the relationship between resistance and voltage

variation of remainder voltage with time and effect of electrode material on it. When a direct current voltage is applied between two electrodes on slices

we have found that at the interface between BaFBr slice surface and electrodes

there exists charge carrier accumulating as a result of the potential barriers

and when the applied voltage was canceled

we can also detect the remainder voltage due to the residual carrier at the interface. The remainder voltage will be decreased with time. When the applied voltage between two electrodes of samples was changed

from higher value to lower one or in inverse direction

the

I-V

curves

therefore the relationship between resistance and voltage

are different. For different materials of electrode

such as Ag or Cu

if applied voltages are low

the remainder voltage is almost a constant which is only related to the material of electrodes

but

when the applied voltage is high enough

the remainder voltage will decrease with the increase of applied voltage. We believe that this phenomenon might result from the penetration of charge carriers through potential barriers under high applied voltages. The investigation results of electrical properties of BaFBr:Eu

2+

show that there exist both electron and hole traps in BaFBr:Eu

2+

. The trapped electrons and holes are first escaped to conduction band or valence band

and then transported

respectively

to excited or fundamental levels of Eu

2+

ion. As a result

the Eu

2+

will be excited and its radiative recombination can be observed.