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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, 17400 cd/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.
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 demonstrated 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 (60 nm, TPD) / emitting layer (60 nm, Alq 3 + red dopant) /LiF(0.5~2 nm) / Al (150 nm)]. 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) and 2% in Alq 3, respectively; and for DCJTB doped devices, 17400 cd / m 2 (chromaticity coordinates: x = 0.51, y = 0.46) and 3846 cd / m 2 (chromaticity coordinates: x = 0.63, y = 0.37) were obtained for DCJTB concentration of 0.2% and 2% in Alq 3, respectively.