In this paper

different concentrations of Gd

2

O

3

have been doped in the preparation of red phosphors Y

2

O

2

S: Eu

3+

. It is discovered that the emission intensity is enhanced 5% and the voltage character (Relation between emission intensity and excitation voltage) is improved by doping proper concentration of Gd

2

O

3

under the emission color

particle size and the properties of physics and chemistry are in keep with the request. The enhancement origins of emission intensity are discussed and analyzed preliminarily. It is lacely that the abnormal change of crystal checks that is led by the substitution of large rradius Eu

3+

ion for smaller radius Y

3+

ion is improved by substitution of Gd

3+

ion for Y

3+

ion

the process of no radiation and crystal defect which lose energy are cut down.The improvement of Eu

3+

ion's crystal field condition give rise to enhance of the main emission peak 626nm

616nm (to be attributed to

5

D

o

7

F

2

) and 704nm (to be attributedto

5

D

o

7

F

4

) in the CR spectra of Y

2

O

2

S: Eu

3+

.