Two dominant bands appear in the emission spectrum of Dy

3+

. The yellow band (575 nm) comes from to the transition

4

F

9/2

6

H

13/2

and the blue band (475 nm) corresponds to the transition

4

F

9/2

6

H

15/2

. According to our former results

two emission peaks were observed in Tm

3+

doped yttrium phosphate-vanadate phosphors

the narrow one at 475 nm originates from the Tm

3+

ion transition

1

G

4

3

H

6

and the weak broad-band around 430 nm belongs to VO

4

3-

group. As we know

at a suitable yellow-to-blue intensity ratio

phosphor will emit white light. So yttrium phosphate-vanadate co-doped with Dy

3+

and Tm

3+

may be used as potential two-band phosphors.On the contrary to conventional methods

aerosol synthesis technique has been employed successfully to prepared phosphor particles with good morphology and uniformity of low concentration dopant in recent years. By coprecipitation reaction

high quality YP

1-x

V

x

O

4

:Dy

3+

Tm

3+

phosphor was prepared. The phosphor was characterized by XRD

SEM

and photoluminescence under UV excitation. The XRD patterns disclosed that the obtained YP

1-x

V

x

O

4

:Dy

3+

Tm

3+

is a compound. The SEM image showed that the size of the phosphor particles is uniform and submicron. The fine particle white emitting phosphors has a strong emission peak around 480 nm which is attributed to the emission from

1

G

4

to

3

H

6

of Tm

3+

and the(

4

F

9/2

6

H

15/2

) transition of Dy

3+

another strong emission around 576 nm originating from the Dy

3+

transition

4

F

9/2

6

H

13/2

and a weak emission peak around 660 nm attributing to Tm

3+

transition

1

G

4

3

H

4

. It is expected that YP

1-x

V

x

O

4

:Dy

3+

Tm

3+

would be a promising two-band phosphors for high pressure mercury lamps (HPML).