Aluminates activated by rare earth Eu

2+

ion are new long lasting photoluminescence materials.These materials have recently attracted more attention due to not only their bright luminescence and super long afterglow without radioactivity but also the extensive application.The SrAl

2

O

4

:Eu

2+

Dy

3+

long lasting photoluminescence powders were synthesized by high temperature solid state reaction in a reducing(atmosphere).By using of low melt point alkali metal borophosphate glass as the basic glaze

SrAl

2

O

4

:Eu

2+

Dy

3+

powder and enamel glaze were mixed up homogeneously

and long lasting photoluminescence enamel coating was prepared by sintering the mixture on the substrate of aluminum alloy.The phosphorescence spectrum of the luminescent enamel is similar to that of the SrAl

2

O

4

:Eu

2+

Dy

3+

powder in both the shape and peak position

i.e

.

a broad band with maximum emission intensity at about 515 nm.Therefore

the long lasting photoluminescence of the enamel is due to the 5d-4f transition of divalent europium.The effects of the amount of the doped phosphor

enamel thickness

sintering temperature and sintering period on the luminescence properties of the(enamel) coating have been investigated.It is observed that the phosphorescence brightness of the enamel is(improved) with that of the doped SrAl

2

O

4

:Eu

2+

Dy

3+

powder.And with the increase of the thickness of the(enamel

) the brightness of the enamel also increases.When the sintering temperature and the sintering time is(increased

) the brightness of the enamel will be decrease

which is ascribed to the destroying of SrAl

2

O

4

:Eu

2+

Dy

3+

.Therefore

low melting temperature and short reaction time is of great benefit to improve the brightness of the enamel.Because the porcelain enamel has the characters of bright phosphorescence

long persistent(period) and smooth surface and so on

it is expected to be widely used in the field of advertisement board

(traffic) indicating board and building

etc

.