In order to use organic light-emitting devices (OLEDs) in display application

it is very important to obtain red emitting light. There are two methods for obtaining red emitting light:doping high fluorescent dyes in host or using metal complexes. Phosphorescent dyes has been used efficiently recently. In this letter

we demonstrate red organic light-emitting devices (OLED) with the electroluminescent layers consisting of aluminum tris(8-hydroxyquinoline) (Alq

3

) doped with the dye DCM and DCJTB

which the emission color depends on the concentration of DCM and DCJTB. The typical cell structure is as follows:[ITO/hole transport layer (60nm

TPD) /emitting layer(60nm

Alq

3

+red dopant) /LiF(0.5～2nm)/Al(150nm)]. For DCM doped devices

the maximum luminance of 148000cd/m

2

(chromaticity coordinates:

x

=0.51

y

=0.47) and 5730cd/m

2

(chromaticity coordinates:

x

=0.58

y

=0.42) are measured for DCM concentration of 0.2% and 2% in Alq

3

respectively; and for DCJTB doped devices

17400cd/m

2

(chromaticity coordinates:

x

=0.51

y

=0.46) and 3846cd/m

2

(chromaticity coordinates:

x

=0.63

y

=0.37) are obtained for DCJTB concentration of 0.2% and 2% in Alq

3

respectively.