For more than one century

the sulfide phosphors have been used as a long-lasting phosphor. However

the sulfide phosphors are not stable and bright enough for many applications. So there has been a great demand for new type host lattices substitutes in recent years. Since scientists firstly reported the green and blue color emitting long-lasting phosphorescence phenomenon from the Eu

2+

-doped alkaline earth aluminates

the oxide-based long-lasting phosphorescent materials

especially the aluminate-base and the silicate-base luminescent host lattices have attracted more and more attention and have been developed rapidly to replace the conventional long-lasting phosphorescent materials. The compounds with perovskite structure are a kind of important luminescent hosts and were paied attention to by researchers in recent years. For example

CaTiO

3

:Pr

3+

was found that it has a red long-lasting phosphorescence and it shoots a wavelength to locate at 613nm

which belongs to the

1

D

2

3

H

4

transition of Pr

3+

. The red phosphor SrTiO

3

:Pr

3+

Al

3+

was synthesized and found that there exists the energy transfer to Pr

3+

from co-doped Al. Although stannum is not the same group elements with titanium

its four value states are quite stable and form perovskite structure with alkaline-earth metals oxides. The titanates and stannates of alkaline-earth metals should be one of important materials with afterglow properties as alkali-earth aluminates. The novel phosphors

CaSnO

3

:Pr

3+

are prepared by the conventional high-temperature solid-state method and their luminescent properties are systematically investigated. XRD

photoluminescence

long-lasting phosphorescence and thermoluminescence spectra are used to characterize the synthesized phosphors. After irradiation under 254nm UV light

these phosphors emit near white light and their phosphorescence can be seen with the naked eye in the darkroom clearly. The result of our research reveal that the CaSnO

3

:Pr

3+

phosphor maybe a novel practical long-lasting phosphorescence phosphor. This is the first time observation of long-lasting phosphorescence in alkaline-earth stannates with perov-skite structure and is of value significance in both realizing mechanism of long-lasting phosphorescence and developing new long afterglow materials of practical application.