<Original Papers>Emission Characteristics of Organic-light-emitting-diode with Phosphorescent Materials

publisher[Abstract] The organic-light-emitting-diodes(OLED) with two phosphorescent materials doped into host material of 4, 4'-Bis(carbazol-9-yl)-biphenyl (CBP) or 1, 3-Di-9-carbazolylbenzene (mCP) were developed. The improvement of current efficiency in the OLED with Bis[2-(4, 6-difluorophenyl) pyridinato-C2,N)] (picolinato)iridium (III) (FIrpic) and Tris [2-phenylpridinato-C2, N]iridium(III)(Ir(ppy)_3) was experimentally observed. In the OLED with the layer blended two phosphorescent dopants, the dopant with lower excitation level than the other would have great influence on the current efficiency