Issue 17, 2016

Crystal structure, photoluminescence and electroluminescence of three bluish green light-emitting iridium complexes

Abstract

Three bis-cyclometalated iridium complexes ((TPP)2Ir(acac), (TPP)2Ir(tpip) and (TPP)2Ir(pic)) with 2-(2-trifluoromethyl)pyrimidine-pyridine (TPP) as the main ligand, 2,4-pentanedionate (acac), tetraphenylimidodiphosphinate (tpip) and picolinate (pic) as the ancillary ligands, respectively, were prepared. Their photoluminescence and electrochemistry properties were investigated in detail, and (TPP)2Ir(tpip) was also examined by X-ray crystallography. These complexes show bluish green emission with a quantum efficiency of 11–14%. The organic light emitting diodes (OLEDs) with the structure of ITO/TAPC (1,1-bis[4-(di-p-tolylamino)phenyl]cyclohexane, 40 nm)/mCP (1,3-bis(9H-carbazol-9-yl)benzene, 10 nm)/Ir complex (8 wt%):PPO21 (3-(diphenylphosphoryl)-9-(4-(diphenylphosphoryl)phenyl)-9H-carbazole, 25 nm)/TmPyPB (1,3,5-tri(m-pyrid-3-yl-phenyl)benzene, 50 nm)/LiF (1 nm)/Al (100 nm) were fabricated to evaluate the potential application of these complexes. A (TPP)2Ir(tpip) emitter based device showed the best performance of a maximum current efficiency (ηc) value of 37.61 cd A−1 and a maximum external quantum efficiency (EQE) of 13.7% with low efficiency roll-off.

Graphical abstract: Crystal structure, photoluminescence and electroluminescence of three bluish green light-emitting iridium complexes

Supplementary files

Article information

Article type
Paper
Submitted
04 Feb 2016
Accepted
10 Mar 2016
First published
11 Mar 2016

Dalton Trans., 2016,45, 7366-7372

Crystal structure, photoluminescence and electroluminescence of three bluish green light-emitting iridium complexes

Q. Xu, X. Liang, L. Jiang, Y. Zhao and Y. Zheng, Dalton Trans., 2016, 45, 7366 DOI: 10.1039/C6DT00518G

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