Thermoluminescence (TL) three-dimensional (3D) spectra of CaSO

4

doped with Eu

and Ag

Mn were measured by 3D TL spectrometer. TL properties and mechanism of the CaSO

4

phosphors were investigated. The glow peaks of Eu

2+

at 385 nm

120℃ and 154℃ are observed. The glow peaks of Eu

3+

are found at 595

620

700 nm in several temperatures. The glow peak at 385 nm

154℃ of Eu

2+

is much stronger than that of Eu

3+

emissions. It is found that annealing method can alter the concentration ratio between the Eu

2+

and the Eu

3+

. The behavior of the Eu

2+

and the Eu

3+

emission related to annealing temperatures is different. The intensity of the emission at 385 nm

154℃ of the Eu

2+

is enhanced as annealing temperature increasing from 600℃

then passes a maximum at 900℃. However

the intensity of the emission of the Eu

3+

ions is decreasing as increasing the temperature from 700℃. Dopant Ag is charge compensation impurity

which enhances the emissions of Eu

3+

after co-doping Ag into CaSO

4

:Eu(0.1%). The glow peak of the Eu

3+

from 220℃ in the CaSO

4

:Eu shifts to 350℃ with enhanced intensity in CaSO

4

:Eu

Ag (0.1%

0.1%) while the glow peak at 385 nm

154℃ of the Eu

2+

are weakened and peak temperature is unchanged. Dopant Mn in CaSO

4

:Eu

Mn play not only a role of luminescence center

but also energy transfer which can transfer energy from the Mn

2+

to the Eu

2+

at 385 nm and 120℃. Therefore the glow peak of the Eu

2+

(385 nm

120℃) is intensified. The CaSO

4

:Eu

Mn prepared by present work is a good phosphor with high luminescence intensity. The results indicated that there are different TL mechanisms between the Eu

2+

ions and the Eu

3+

ions.