The development of flat panel display devices such as field emission displays (FEDs) and vacuum fluorescent displays (VFDs) requires highly efficient cathodoluminescent materials.While many efficient sulfide-based phosphors have been explored as possible low-voltage phosphors

the volatility of sulfur has prohibited their use in FEDs or VFDs.Sulfide-base phosphors often degrade under high energy electron bombardment due to dissociation of the cation-sulfur bonds.Oxide phosphors offer potential advantage because of their superior stability under electron bombardment and excellent luminescent properties.SrGa

2

O

4

is an attractive oxide phosphor for low-voltage cathodoluminscence applications in VFDs and FEDs.Like other wide bandgap semiconductors

SrGa

2

O

4

exhibits a purple emission.Activation with Eu

3+

ions

the emission shifts to red.The Eu

3+

doped SrGa

2

O

4

phosphor was prepared with the conventional solid-state reaction method.The phase composition was characterized by powder X-ray diffraction.The result shows that the producing powder belongs to monoclinic crystal system with its lattice constants:

a

=0.943 nm

b

=0.900 nm

c

=0.839 nm

β=89.06°

and with space group P2

1

/c(No.14).The excitation and emission spectra were measured.The main peak at 610 nm can be ascribed to the electric dipole transition

5

D

0

→

7

F

2

which indicates that Eu

3+

occupies a site lacking inversion symmetry.The peaks at 590

610 nm transition emission split to two peaks:

5

D

0

→

7

F

1

(586

597 nm) and

5

D

0

→

7

F

2

(609

615 nm)

respectively

due to the crystal-field in the conditions of mole fraction of Eu

3+

with more than 1%.The strength ratio of two parts for the splitting peak

7

F

2

can be changed according to the concentration of Eu

3+

.