Abstract
To improve the low efficiency and color impurity in red fluorescent top-emitting organic light-emitting devices (OLEDs), a yellow phosphorescent iridium complex of bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2'] iridium (acetylacetonate) [(t-bt) 2 Ir(acac)] was introduced to a red device with a fluorescent material 3-(dicyanomethylene)-5,5-dimethyl-1-(4-dimethylamino-styryl)cyclohexene (DCDDC), respectively. By adjusting the concentration of DCDDC dye, the luminescence spectra and electrics characteristics of various devices were investigated. The results showed that the performance of the fluorescent-phosphor-sensitized devices were significant improved comparing to the traditional red fluorescent devices. The function of phosphor-sensitizer in energy transfer mechanism was analyzed. The affects of phosphor-sensitizer in these co-doped red OLED were discussed.
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