Study on the rubrene emission sensitized by a phosphorescent Ir compound in the host of CBP

To obtain the maximum luminous efficiency from an organic material, it is necessary to harness both the spin-symmetric and anti-symmetric molecular excitations (bound electron hole pairs, or excitons) that result from electrical pumping. Here, we demonstrate that this deficiency can be overcome by using a phosphorescent sensitizer to excite a fluorescent dye. The photoluminescence and sensitization effect between tris (2-phenylpyridine) iridium (Ir(ppy)3) and 5,6,11,12-tetraphenylnaphthacene (rubrene) in the host of 4,4'-N,N-dicarbazole-biphenyl (CBP) were investigated. The energy transfer characteristics in the electroluminescent process of the system of CBP, Ir(ppy)3 and Rubrene has been discuss in this article. The Ir(ppy)3 sensitizer affords an effective way to improve the device performance. In the organic light-emitting diodes based on the Ir(ppy)3, rubrene and CBP system, both the singlet and triplet excitons can be used.