Synthesis and Characterization of Red‐Emitting Iridium(III) Complexes for Solution‐Processable Phosphorescent Organic Light‐Emitting Diodes |
| |
Authors: | Seung‐Joon Lee Jin‐Su Park Myungkwan Song In Ae Shin Young‐Inn Kim Jae Wook Lee Jae‐Wook Kang Yeong‐Soon Gal Sunwoo Kang Jin Yong Lee Sung‐Hyun Jung Hyung‐Sun Kim Mi‐Young Chae Sung‐Ho Jin |
| |
Affiliation: | 1. Department of Chemistry Education Interdisciplinary Program of Advanced Information and Display Materials and Center for Plastic Information System Pusan National University Busan, 609‐735 (Korea);2. Department of Chemistry Dong‐A University Busan, 604‐714 (Korea);3. Department of Surface Technology Korea Institute of Materials Sciences (KIMS) Changwon, 641‐831 (Korea);4. Polymer Chemistry Lab College of General Education Kyungil University Hayang, 712‐701 (Korea);5. Department of Chemistry Sungkyunkwan University Suwon, 440‐746 (Korea);6. Cheil Industries Inc Uiwang‐Si, Gyeonggi‐Do, 437‐711 (Korea) |
| |
Abstract: | A new series of highly efficient red‐emitting phosphorescent Ir(III) complexes, (Et‐CVz‐PhQ)2Ir(pic‐N‐O), (Et‐CVz‐PhQ)2Ir(pic), (Et‐CVz‐PhQ)2Ir(acac), (EO‐CVz‐PhQ)2Ir(pic‐N‐O), (EO‐CVz‐PhQ)2Ir(pic), and (EO‐CVz‐PhQ)2Ir(acac), based on carbazole (CVz)‐phenylquinoline (PhQ) main ligands and picolinic acid N‐oxide (pic‐N‐O), picolinic acid (pic), and acetylacetone (acac) ancillary ligands, are synthesized for phosphorescent organic light‐emitting diodes (PhOLEDs), and their photophysical, electrochemical, and electroluminescent (EL) properties are investigated. All of the Ir(III) complexes have high thermal stability and emit an intense red light with an excellent color purity at CIE coordinates of (0.65,0.34). Remarkably, high‐performance solution‐processable PhOLEDs were fabricated using Ir(III) complexes with a pic‐N‐O ancillary ligand with a maximum external quantum efficiency (5.53%) and luminance efficiency (8.89 cd A?1). The novel use of pic‐N‐O ancillary ligand in the synthesis of phosphorescent materials is reported. The performance of PhOLEDs using these Ir(III) complexes correlates well with the results of density functional theory calculations. |
| |
Keywords: | Electroluminescent Phosphorescent organic light‐emitting diodes Red emitters Solution‐processable materials |
|
|