Recent development of field emission display (FED) device require searching for some new kind of phosphor material which

c

an possess low excitation potential

chemical and thermal stability

long service life at high

c

urrent densities.YAGG:Tb phosphor has been used as an green phosphor for PTV application.It shows green emission with high brightness and good chromaticity under high energy electron beam excitation.The co activated lanthanon such as Ce

Dy

Gd was study separately and exhibited good brightness.We synthesize and carry on surface perfect the phosphor and try this phosphor to be used in low voltage range such as 0～3000V which is suitable for FED.The YAGG:Tb

Gd powder was synthesized by heating highly pure powders of Tb

2

O

3

Ga

2

O

3

Gd

2

O

3

Al

2

O

3

and other flux at 1400～1500℃ in the air.After that

acid and pure water was used to clean the phosphor.At last

polymer binder was used to film the phosphor.The emission peak of YAGG:Tb

Gd excited by electron ray was in 544nm similar with YAGG:Tb.Its relative luminescencent brightness change with voltage of electron ray was show in Fig.1.The properties of traditional green phosphor ZnO:Zn was used as standard.It can be seen that the relative brightness of YAGG:Tb is higher than that of ZnO:Zn at 0～3000V excited voltage and the dead voltage was similar with ZnO:Zn.It has not saturation situation as ZnO:Zn.Fig.2 shows the change curve of relative brightness of YAGG:Tb

Gd and ZnO:Zn with excited current density.YAGG:Tb

Gd also shows the good behavior.The YAGG:Tb

Gd was synthesized and improved with suitable method.After compared with ZnO:Zn

it was concluded that it will be more effective at strong excited condition.