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.
关键词
红色发光有机薄膜发光二极管
Keywords
red light emissionorganic thin filmelectroluminescent devices