Molecular Crystals and Liquid Crystals, Vol.424, 111-117, 2004
Novel green phosphorescent materials with various substituted acetylacetonate ligands for organic electroluminescent device
Novel green phosphorescent materials, IR-PPA1, IR-PPA2 and IR-PPA3 were synthesized as emission dopants for electroluminescent(EL) devices. Four kinds of devices were fabricated and the structures of devices were ITO/NPD/IR-PPA1(6%), IR-PPA2(6%), IR-PPA3(6%) or IR-PPY(6%.) in CBP/BCP/Alq/LiF/Al, where IR-PPY was used as a reference material for comparison Novel phosphorescent materials, IR-PPA1, IR-PPA2 and IR-PPA3 represented the luminances of 3930cd/m(2), 3220cd/m(2) and 2620cd/m(2), and their external quantum efficiencies, about 9.4%, 7.8% and 6.4% in 11 mA/cm(2) of current density in the EL devices, respectively, The maximum, of EL spectra of novel emission dopants were detected at 532 nm in the IR-PPA1 device, and 525 nm in the IR-PPA2 device and 530 nm in the IR-PPA3 device.