Electroluminescent properties of an emissive binuclear platinum(II) complex have been studied. We fabricated organic light-emitting diodes based on Pt2(ppy)2(pyt)2 (ppy = 2-phenylpyridine, pyt = pyridine-2-thiolate) phosphor, which exhibits an emission from a 3MMLCT state based on a Pt-Pt interaction. An electrophosphorescent device with a multilayer configuration of ITO/CuPc/NPB/Pt2(ppy)2(pyt)2/BAlq/Alq3/LiF/Al demonstrated red emission with Commission Internationale de L'Eclairage (CIE) coordinates of x=0.65, y=0.35, a maximum luminous efficiency of 1.8 cd/A (1.0 mA/cm2), and an external quantum efficiency of 3.4%.
Microwave synthesis of tris-ortho-metalated Ir(III) complexes was performed and resulted complexes were applied to the electrophosphorescent devices. For synthesis of Ir(ppy) 3 , the product was obtained by 30 min. microwave irradiation. That is microwave irradiation reduced the reaction time to 1/20 of that under conventional heating. Furthermore, we succeeded the rapid microwave synthesis of tris(2-phenyl-1-quinoline)iridium(III), Ir(phq) 3 , which is hard to synthesis by conventional method. An electrophosphorescent device with Ir(phq) 3 as a dopant in emitting layer was developed. It demonstrated a highefficient orange emission with maximum luminous efficiency of 33.4 cd/A and a power efficiency of 11.7 lm/W at 800 cd/m 2 . The color of emission corresponds to CIE coordinates x ¼ 0:56, y ¼ 0:43. The device showed a projected operational lifetime, namely T 1=2 , of 6500 h at an initial brightness of 1500 cd/m 2 under constant dc drive.
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