High efficiency green OLEDs based on homoleptic iridium complexes with steric phenylpyridazine ligands

• Published in: Dalton transactions : an international journal of inorganic chemistry 2018, Vol.47 (35), p.12243-12252
• Main Authors: Tong, Bihai, Wang, Han, Chen, Man, Zhou, Shixiong, Hu, Yuanyuan, Zhang, Qianfeng, He, Gufeng, Fu, Lianshe, Shi, Huatian, Jin, Long, Zhou, Huidong
• Format: Article
• Language: English
• Subjects: Coordination compounds; Density functional theory; Electroluminescence; Iridium; Iridium compounds; Organic light emitting diodes; Phosphorescence; Time dependence
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c8dt02781a

A series of steric phenylpyridazine based homoleptic iridium(iii) complexes (1-3) have been synthesized with novel one-pot methods. Single X-ray structural analyses are conducted on complexes 1 and 2 to reveal their coordination arrangement. These complexes exhibit a very strong green phosphorescence emission with high quantum yields of over 64%. The relationship between photophysical properties and the substituent nature of the complexes is discussed by density functional theory (DFT) and time-dependent DFT. Self-quenching is significantly reduced for these complexes in solid even at very high concentrations because the sterically hindered bicyclo [2.2.2] oct-2-ene and m-substituted CF3 spacers in the phosphor molecules lead to minimum bimolecular interactions. Accordingly, the electroluminescence device based on complex 3 exhibits a maximum luminous efficiency of 64.1 cd A-1 with a high EQE of 25.2% at a high doping concentration of 15 wt%. Meanwhile, when neat 3 was adopted as the emitting layer, the non-doped green device gives a state-of-the-art EQE as high as 15.2% (40.1 cd A-1) along with CIE coordinates of (0.346, 0.599).