Abstract
We obtain a nondoped red organic light-emitting diode (OLED) structureITO/pc-PPV (~30 nm)/DCM (~30 nm) /BCP (~30 nm)/Mg:Ag,where DCM refers to4-(dicyanomethylene)-2-methyl-6-[(4-dimethylaninostyryl)-4-H-pyran].The OLED shows pure and stable red luminescence depending onthe driving voltages. The maximum luminance is 330 Cd/m2 and theturn-on voltage is as low as ~2 V. The reason why theconcentration quenching of DCM could be reduced in this structure isinvestigated. In the preparation process, both the hole-transportinglayer and the emitter layer are formed by the spin-coated method. It isbelieved that this method can lead to a new way to avoid theconcentration quenching of red-emitting materials.
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