Three kinds of white organic light emitting devices (WOLED) were constructed:Cell-S

with a single-doped red dye in the light emitting layer(EML); Cell-D

with both red and blue dyes doped in a single EML(double-doped); Cell-T

with red and blue dyes doped in one EML and a green dye in another layer(triple-doped).The structure of these devices are as follows:Cell-S:CuPc(12nm)/NPB(40nm)/ADN:DCJTB(50nm)/Alq

3

(12nm)/LiF(4nm)/Al; Cell-D:CuPc(12nm)/NPB(40nm)/ADN:DCJTB:TBPe(50nm)/Alq

3

(12nm)/LiF(4nm)/Al; Cell-T:CuPc(12nm)/NPB(40nm)/ADN:DCJTB:TBPe(50nm)/Alq

3

:C545(12nm)/LiF(4nm)/Al. Experimentals indicate that the Cell-T and Cell-D show much higher luminance and efficiency than that of Cell-S.The Cell-T achieves a current efficiency of 6cd/A and a power efficiency 3.11 lm/W

which is twice that of Cell-S

1026cd/m

2

at driving current 20mA/cm

2

and maximum luminance 21200cd/m

2

In addition

it exhibits a flatcd/Avs. current density response

indicating a weak current induced fluorescence quenching. At the driving current 12mA/cm

2

at the initial luminance of 575cd/m

2

the half life is over 3862h for Cell-T

for an initial luminance of 100cd/m

2

the half life (

t

/2) is projected to be 22245h with a little change of EL spectrum before and after aging.