The fluorescence-of Cu

+

and Eu

2+

coactivated CaS is reported. The emission bands of Cu

+

and Eu

2+

peaking at 430 nm and 630 nm were originated from Cu

+

transition of Cu'

Ca

-V

s

2+

centers and 5d-4f transition of Eu

2+

respectively. The dependence of luminescence properties of Cu

+

nd Eu

2+

on their concentration was investigatad. The emission of Eu

2+

is sensitized by Cu

+

and the peak wavelength and intensity of Cu

+

-emission band are affected by Eu

2+

. The experimental results indicate that there exists effective energy transfer from Cu

+

to Eu

2+

in CaS host. CaS·Cu

+

and CaS·Eu

2+

are good red-light transition agent and blue-light trasition agent for farm film

respectively. The absorption spectrum of chlorophyll photosynthesis can be imitated-by light transition film for farm using CaS·Cu

+

Eu

2+

phosphor as additive

Which can make the crops growth in the environment of function spectrum of the best growth of plants

and promote its growth or increase yield.