Synthesis of Y

2

O

2

S:Eu

3+

Mg

2+

Ti

4+

red phosphor by flux fusion method was presented.The X-ray diffraction analysis showed that the crystal structure was Y

2

O

2

S.the decay curves of Y

2

O

2

S:Eu

3+

and Y

2

O

2

S:Eu

3+

Mg

2+

Ti

4+

were measured

the afterglow time of Y

2

O

2

S:Eu

3+

was about 30 min

the afterglow time of Y

2

O

2

S:Eu

3+

Mg

2+

Ti

4+

was over 70 min.The emission spectra and excitation spectra of the phosphor were acquired.The emission spectra showed that Y

2

O

2

S:Eu

3+

Mg

2+

Ti

4+

had narrow emission peaks:the emission peaks at 583.5 nm(

5

D

0

7

F

0

);595.5

597.3nm(

5

D

0

7

F

1

);617.3

627.0 nm(

5

D

0

7

F

2

);705.3

707.0 nm(

5

D

0

7

F

4

)ascribed to Eu

3+

ions transition from

5

D

0

7

F

J

(J=0

1

2

3

4);556.4 nm(

5

D

1

7

F

2

);587.6

589.5 nm(

5

D

1

7

F

3

)ascribed to Eu

3+

ionstransition from

5

D

1

to

7

F

J

(J=2

3);467.8

469.5 nm(

5

D

2

7

F

0

);475.5

477.5 nm(

5

D

2

7

F

1

);488.3

490.6 nm(

5

D

2

7

F

2

);513.0

514.0 nm(

5

D

2

7

F

3

);540.1

544.3 nm(

5

D

2

7

F

4

)ascribed to Eu

3+

ions transition from

5

D

2

7

F

J

(J=0

1

2

3

4);497.0 nm(

5

D

3

7

F

5

)ascribed to Eu

3+

ions transition from

5

D

3

7

F

J

(J=5)were found.The characteristic red emission at 617.3

627.0 nm were due to the dominant

5

D

0

7

F

2

electric dipole transition

and the emission at 627.0 nm was dominant.Due to the function of weak crystal field

the emission ascribed to energy transition

5

D

1

7

F

3

5

D

0

7

F

1

and

5

D

0

7

F

4

divided.The excitation spectra of Y

2

O

2

S:Eu

3+

Mg

2+

Ti

4+

showed that it had excitation peaks at 345

260

396

468

540 nm

etc.The excitation peak at 345 nm was ascribed to the absorption of charge transfer(Eu

3+

-O

2-

Eu

3+

-S

2-

).The excitation peaks at 468

520

540 nm were ascribed to the representative 4f-4f energy transition of Eu

3+

ions.The thermoluminescence glow curves of Y

2

O

2

S:Eu

3+

and Y

2

O

2

S:Eu

3+

Mg

2+

Ti

4+

were measured.The adulteration of Mg

2+

Ti

4+

affected the afterglow characteristic of Y

2

O

2

S:Eu

3+

Mg

2+

Ti

4+

distinctly.The thermoluminescence glow curve of Y

2

O

2

S:Eu

3+

could be fitted to the peaks at 237

276

301 K.The thermoluminescence glow curve of Y

2

O

2

S:Eu

3+

Mg

2+

Ti

4+

could be fitted to the peaks at 149

215

262

287

334 K.The afterglow characteristic of Y

2

O

2

S:Eu

3+

and Y

2

O

2

S:Eu

3+

Mg

2+

Ti

4+

mainly related to the thermal peaks at 301

334 K respectively.The adulteration of the Mg

2+

Ti

4+

could enhance the afterglow characteristic of phosphor distinctly.