5-Isobutyryl-2-Phenylpyridine-Derived Iridium Complexes for Red Phosphorescent Light-Emitting Diodes
作者:Kum Hee Lee、Seul Ong Kim、Ji Hyun Seo、Young Kwan Kim、Seung Soo Yoon
DOI:10.1166/jnn.2011.3696
日期:2011.5.1
For the development of efficient red materials in organic light emitting diodes, a series of cyclometalated iridium complexes with 5-isobutyryl-2-arylpyridine-derived ligands were synthesized. Complexes 1–4 exhibited red phosphorescence with quantum yields of 0.16–0.48 in degassed CH2Cl2. An OLED device employing iridium complex 3 as a dopant exhibited the best performance with a maximum luminance of 35500 cd/m2 at 14 V and luminance and power efficiencies of 15.5 cd/A and 6.23 lm/W at 20 mA/cm2, respectively. In the device employing complex 2 as the dopant, the maximum luminance was 6300 cd/m2 at 14 V and the maximum luminance efficiency and power efficiencies were 5.23 cd/A and 3.16 lm/W at 5.2 V, respectively, with CIE coordinates of (0.66, 0.32) at 9.0 V, close to the saturated red emission.
为了开发有机发光二极管中的高效红色材料,我们合成了一系列具有 5-异丁酰基-2-芳基吡啶配体的环甲基化铱配合物。配合物 1-4 在脱气的 CH2Cl2 中显示出红色磷光,量子产率为 0.16-0.48。采用铱配合物 3 作为掺杂剂的 OLED 器件性能最佳,在 14 V 电压下的最大亮度为 35500 cd/m2,在 20 mA/cm2 电压下的亮度和功率效率分别为 15.5 cd/A 和 6.23 lm/W。在使用复合物 2 作为掺杂剂的器件中,14 V 时的最大亮度为 6300 cd/m2,5.2 V 时的最大亮度效率和功率效率分别为 5.23 cd/A 和 3.16 lm/W,9.0 V 时的 CIE 坐标为(0.66,0.32),接近饱和红色发射。