Synthesis and characterization of new blue light emitting iridium complexes containing a trimethylsilyl group
- 11 September 2012
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 22 (42), 22721-22726
- https://doi.org/10.1039/c2jm33084a
Abstract
New blue iridium complexes with a trimethylsilyl group as a bulky electron donating group, Ir(F2-p-trimethylsilyl)2(fptp) and Ir(F2-m-trimethylsilyl)2(fptp), were synthesized via μ-chloro-bridged dimer and perfluoropropylated triazole-based ancillary ligands and then characterized using various spectroscopic studies. Both Ir(F2-p-trimethylsilyl)2(fptp) and Ir(F2-m-trimethylsilyl)2(fptp) exhibited high photoluminescence quantum efficiencies of 75 ± 5% and 76 ± 5% in films, respectively. The DFT calculation demonstrated that the new blue iridium complexes have a wide bandgap compared with FIrpic and the Ir(F2-p-trimethylsilyl)2(fptp) with a trimethylsilyl group in the para position has a slightly deeper HOMO level than that of the Ir(F2-p-trimethylsilyl)2(fptp) with a trimethylsilyl group in the meta position. The UV-vis absorption and photoluminescent (PL) spectra of the complexes were blue shifted compared with those of FIrpic. The device using the Ir(F2-p-trimethylsilyl)2(fptp) exhibited a maximum external quantum efficiency of 19.3% (at 0.00152 mA cm−2) and commission Internationale de l'Eclairage (CIE) coordinates of (0.145, 0.247).Keywords
This publication has 36 references indexed in Scilit:
- A new N-fluorenyl carbazole host material: Synthesis, physical properties and applications for highly efficient phosphorescent organic light emitting diodesOrganic Electronics, 2011
- A green emitting iridium(III) complex with narrow emission band and its application to phosphorescence organic light-emitting diodes (OLEDs)Organic Electronics, 2009
- Structure–Property Relationship of Pyridine‐Containing Triphenyl Benzene Electron‐Transport Materials for Highly Efficient Blue Phosphorescent OLEDsAdvanced Functional Materials, 2009
- Solution‐Processible Phosphorescent Blue Dendrimers Based on Biphenyl‐Dendrons and Fac‐tris(phenyltriazolyl)iridium(III) CoresAdvanced Functional Materials, 2008
- Phosphorescent Iridium(III) Complexes with Nonconjugated Cyclometalated LigandsChemistry – A European Journal, 2008
- Highly Efficient Blue‐Emitting Iridium(III) Carbene Complexes and Phosphorescent OLEDsAngewandte Chemie, 2008
- Amorphous Diphenylaminofluorene-Functionalized Iridium Complexes for High-Efficiency Electrophosphorescent Light-Emitting DiodesAdvanced Functional Materials, 2006
- Effective Electrophosphorescence Emitting Devices by Using New Type Ir(III) Complex with Bluky Substistuent SpacersMolecular Crystals and Liquid Crystals, 2006
- Heteroleptic Cyclometalated Iridium(III) Complexes Displaying Blue Phosphorescence in Solution and Solid State at Room TemperatureInorganic Chemistry, 2005
- Effect of Substitution of Methyl Groups on the Luminescence Performance of IrIII Complexes: Preparation, Structures, Electrochemistry, Photophysical Properties and Their Applications in Organic Light‐Emitting Diodes (OLEDs)European Journal of Inorganic Chemistry, 2004