Lee Kum Hee, Kim Jin Ho, Seo Ji Hyun, Kim Young Kwan, Yoon Seung Soo
Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea.
J Nanosci Nanotechnol. 2010 May;10(5):3193-7. doi: 10.1166/jnn.2010.2237.
To develop efficient emitting materials for organic light-emitting diodes (OLEDs), a series of cyclometalated iridium complexes with 2-fluorenylpyridine-derived ligands were synthesized. Complexes 1-4 exhibited yellow to red phosphorescence with quantum yields of 0.17-0.33 in degassed CH2Cl2. Multilayered OLEDs were fabricated by using these iridium complexes as dopant materials. In the device employing complex 1 as a dopant, the maximum luminance, maximum luminance efficiency and maximum power efficiency were 15600 cd/m2 at 14 V, 12.8 cd/A, and 8.94 Im/W, respectively, at the CIE coordinates of (0.648, 0.350), which is close to the saturated red emission. The electron-withdrawing carbonyl substituent groups affected markedly the EL performances of fluorenylpyridine-derived iridium complexes as red emitting materials.
为了开发用于有机发光二极管（OLED）的高效发光材料，合成了一系列具有2-芴基吡啶衍生配体的环金属化铱配合物。配合物1-4在脱气的二氯甲烷中呈现出黄色至红色磷光，量子产率为0.17-0.33。通过使用这些铱配合物作为掺杂材料制备了多层OLED。在采用配合物1作为掺杂剂的器件中，在14V时最大亮度、最大亮度效率和最大功率效率分别为15600cd/m²、12.8cd/A和8.94lm/W，在CIE坐标为(0.648,0.350)处，接近饱和红色发射。吸电子羰基取代基对芴基吡啶衍生的铱配合物作为红色发光材料的电致发光性能有显著影响。
