Abstract
We demonstrated the red phosphorescent organic light-emitting diodes with sensitizer, iridium(III) tris(2-phenylpyridine) [Ir(ppy) 3 ]. The devices with sensitizer showed a significant improvement in a luminance and efficiency compared to those without sensitizer. Moreover, the electroluminescent (EL) spectra of devices with sensitizer show a similar emission peak with photoluminescent (PL) spectra of iridium(III) bis(2-phenylquinoline)(acetylaceton) [Ir(pq) 2 (acac)] under the optimized doping ratio of Ir(pq) 2 (acac) and Ir(ppy) 3 . It is because that the triplet metal-to-ligand charge transfer (3MLCT) state of Ir(ppy) 3 is higher than that of Ir(pq) 2 (acac) and the intra-molecular energy transfer (IMET) time (within ns time scale) from the ppy-centered 3MLCT state to the pq-centered 3MLCT state is shorter than the radiative lifetime (within µs time scale) of Ir(ppy) 3 .
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