@article{95627d9286674cb0a57f64f474843442,
title = "Efficient solution-processed yellow/orange phosphorescent OLEDs based on heteroleptic Ir(Ⅲ) complexes with 2-(9,9-diethylfluorene-2-yl)pyridine main ligand and various ancillary ligands",
abstract = "Efficient solution-processible yellow/orange emissive phosphors are highly required in solution-processed phosphorescent organic light-emitting diodes (s-PhOLEDs). With respect to phenyl pyridine (ppy)-type Ir(III) complexes, 2-(9,9-diethylfluoren-2-yl)pyridine (Flpy)-type Ir(III) complexes have huge potential in yellow/orange s-PhOLEDs due to their extended conjugation and excellent solubility in common organic solvents. Herein, a new series of phosphorescent Ir(III) complexes, i.e. Ir(Flpy)2pic-N–O, Ir(Flpy-CF3)2pic-N–O, Ir(Flpy-CF3)2dbm and Ir(Flpy-CF3)2acac, based on Flpy main ligand and picolinic N-oxide (pic-N–O), acetylacetone (acac), and dibenzoyl methane (dbm) ancillary ligands are synthesized. The photophysical, electrochemical, and electroluminescent (EL) properties of these phosphorescent Ir(III) complexes are investigated in details. By introducing the CF3 group in Flpy ligand and varying the ancillary ligands, the emission spectra of these phosphorescent complexes are tuned in a large range with EL emission peaks from 544 nm to 588 nm. The s-PhOLEDs employing these phosphors show promising EL performance with maximum external quantum efficiency (EQE) from 15.4% to 23.7% and high power efficiency from 61.9 l m W−1 to 80.4 l m W−1. These highly efficient phosphorescent Ir(III) complexes may serve as ideal chromaticity components in solution-processed full-color displays and lighting devices.",
keywords = "Ancillary ligands, Iridium complex, Organic light-emitting diode, Solution-processed, Yellow/orange emission",
author = "Xuejing Liu and Bing Yao and Hailong Wang and Baohua Zhang and Xingdong Lin and Xiaofei Zhao and Yanxiang Cheng and Zhiyuan Xie and Wong, {Wai Yeung}",
note = "Funding Information: X.-J. Liu and B. Yao contributed equally to this work. B.-H. Zhang and Z.-Y. Xie acknowledge financial support from the National Key Basic Research and Development Program of China (973 program, Nos. 2015CB655001, 2014CB643504) founded by MOST and the National Natural Science Foundation of China (Nos. 51473162, 51773195, 51325303, 21334006). The financial support of the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB12030200) is also acknowledged. W.-Y.W. acknowledges the financial support from Hong Kong Research Grants Council (HKBU 12304715), Areas of Excellence Scheme, University Grants Committee of HKSAR (AoE/P-03/08), the Hong Kong Polytechnic University (1-ZE1C), and Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences. Funding Information: X.-J. Liu and B. Yao contributed equally to this work. B.-H. Zhang and Z.-Y. Xie acknowledge financial support from the National Key Basic Research and Development Program of China (973 program, Nos. 2015CB655001 , 2014CB643504 ) founded by MOST and the National Natural Science Foundation of China (Nos. 51473162 , 51773195 , 51325303 , 21334006 ). The financial support of the Strategic Priority Research Program of the Chinese Academy of Sciences ( XDB12030200 ) is also acknowledged. W.-Y.W. acknowledges the financial support from Hong Kong Research Grants Council ( HKBU 12304715 ), Areas of Excellence Scheme, University Grants Committee of HKSAR ( AoE/P-03/08 ), the Hong Kong Polytechnic University ( 1-ZE1C ), and Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences . Appendix A ",
year = "2018",
month = mar,
doi = "10.1016/j.orgel.2017.12.050",
language = "English",
volume = "54",
pages = "197--203",
journal = "Organic Electronics",
issn = "1566-1199",
publisher = "Elsevier BV",
}