期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 -, 期 15-16, 页码 2556-2561出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201501318
关键词
Iridium; Organic light-emitting diodes; Luminescence; O ligands; Cyclometalated ligands
资金
- National Natural Science Foundation of China [21371093, 91433113, 21401099]
- Major State Basic Research Development Program [2013CB922101]
- Natural Science Foundation of Jiangsu Province [BK20130054]
Two phosphorescent Ir-III complexes Ir1 and Ir2 containing 5-fluoro-2-[4-(trifluoromethyl)phenyl]pyrimidine and 2-(3,4-difluorophenyl)-5-fluoropyrimidine as cyclometalated main ligand and tetraphenylimidodiphosphinate as ancillary ligand were synthesized. Ir1 was characterized by single-crystal X-ray crystallography. Ir1 and Ir2 show green emissions peaking at 527 and 513 nm, respectively. By using the two complexes as emitters, organic light-emitting diodes (OLEDs) with the structure of TAPC (1,1-bis[4-(di-p-tolylamino)phenyl]cyclohexane, 40 nm)/Ir1 or Ir2 (10 wt.-%):mCP (1,3-bis(9H-carbazol-9-yl)benzene, 20 nm)/TmPyPB (1,3,5-tris(m-pyrid-3-ylphenyl)benzene, 30 nm)/LiF (1 nm)/Al (100 nm) showed high performance with maximum current efficiencies as high as 81.91 or 71.17 cdA(-1) and maximum external quantum efficiencies of 20.8 or 21.3%, respectively. The low-efficiency roll-off ratios of the two devices suggest that the two complexes have potential applications in OLEDs.
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