Lee Kum Hee, Seo Ji Hyun, Kim Young Kwan, Yoon Seung Soo
Department of Chemistry Sungkyunkwan University, Suwon 440-746, Korea.
J Nanosci Nanotechnol. 2009 Dec;9(12):7099-103. doi: 10.1166/jnn.2009.1659.
Two novel iridium complexes, bis[2-(1,1',2',1"-terphen-3-yl)pyridinato-C,N]iridium(III) (acetylacetonate) (tphpy)2Ir(acac) and bis[2-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalen-2-yl)pyridinato-C,N]- iridium(III) (acetylacetonate) (tmhppy)2Ir(acac), were synthesized and characterized using the various spectroscopic methods. Multilayered, organic light-emitting diodes (OLEDs) were fabricated by using the complexes as dopant materials. A maximum luminance of 57840 cd/m2 at 14 V and a luminance efficiency of 40 cd/A at 20 mA/cm2 were achieved. The peak wavelength of the electroluminescence was at 527 nm with CIE coordinates of (0.34, 0.63), and the device showed a stable color chromaticity at various voltages. Significantly improved operational lifetime was achieved using (tphpy)2Ir(acac) and (tmhppy)2Ir(acac) compared to that using (ppy)2Ir(acac), at the same doping level.
合成了两种新型铱配合物，双[2-(1,1',2',1"-三联苯-3-基)吡啶-C,N]铱(III)（乙酰丙酮盐）(tphpy)2Ir(acac)和双[2-(5,5,8,8-四甲基-5,6,7,8-四氢萘-2-基)吡啶-C,N]-铱(III)（乙酰丙酮盐）(tmhppy)2Ir(acac)，并使用各种光谱方法对其进行了表征。通过使用这些配合物作为掺杂材料制备了多层有机发光二极管（OLED）。在14 V时实现了57840 cd/m2的最大亮度，在20 mA/cm2时实现了40 cd/A的发光效率。电致发光的峰值波长为527 nm，CIE坐标为(0.34, 0.63)，并且该器件在各种电压下显示出稳定的色度。与在相同掺杂水平下使用(ppy)2Ir(acac)相比，使用(tphpy)2Ir(acac)和(tmhppy)2Ir(acac)实现了显著提高的工作寿命。
