一种新型铱(Ⅲ)配合物及其有机电致发光器件

A New Iridium(Ⅲ) Complex and Its Application in Organic Electrophosphorescent Device

报道了一种新的基于2,5-二(4-乙基苯基)吡啶配体的铱(Ⅲ)配合物,并用于有机电致发光器件,得到λm ax=548 nm的绿光发射,其最大发光效率为23 cd/A,最大亮度为10 800 cd/m2。与基于其他绿光铱(Ⅲ)配合物的器件相比,该器件的电流饱和特性也得到进一步改善。

sion under Organic light-emitting devices （OLEDs）, which consist of organic thin films and exhibit light emiselectric current excitation, are expected to be one of the most promising candidates for fiat panel display. After Tang reported the efficient double-layer OLEDs, different types of fluorescent materials have been studied and tremendous progress has been made in the past decade. To further improve EL efficiency, the organic phosphorescent materials, which harvest excitation energy of both singlet and triplet states, have been introduced in OLEDs. By employing the phosphorescent materials, the internal quantum efficiency can theoretically reach 100% and emission color can be tuned by modifying the phenylpyridine ligand. The complexes based on Ir（ PPY）3 skeleton have such a simple molecular structure and excellent luminescent properties that many efforts are still focusing on chemical modification of this type of complexes for better electrophosphorescent performance. We synthesized a new iridium （Ⅲ） complex, iridium （Ⅲ） bis （2,5-di（4-ethylphenyl） pyridinato-N, C2＇ ） acetylacetonate [ （ deppy ） 2 Ir （ acac ） ], based on 2,5-di （ 4-ethylphenyl ） pyridine ligand. EL device was fabricated based on 6% （mass fraction） of （deppy）2Ir（acac） doped in CBP. A maximum luminance efficiency of 23 cd/A and a peak luminance of 10 800 cd/m^2 were achieved, the device showed green emission corresponding to a maximum wavelength of 548 nm. On the other hand our electrophosphorescent devices show excellent current saturation behavior at higher current density.