Citation: ZHANG Song, XUE Li-Sha, WU Chen, ZHENG You-Xuan*, ZUO Jing-Lin*. Synthesis and Electroluminescence of Two Red Iridium Complexes[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(1): 134-141. doi: 10.11862/CJIC.2014.073 shu

Synthesis and Electroluminescence of Two Red Iridium Complexes

1.
State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China

Received Date: 27 September 2013
Available Online: 31 October 2013
Fund Project:

By introducing tetraphenylimidodiphosphinate (Htpip) as the ancillary ligand, two iridium complexes Ir(tfmpiq)₂tpip and Ir(dfpiq)₂tpip (dfpiq=2-(2,4-difluorophenyl)quinoline, tfmpiq=2-(4-(trifluoromethyl)phenyl)quinoline) have been synthesized. For the emission spectra in CH₂Cl₂ solution, the maximum peaks locate at 622 and 600 nm for Ir(tfmpiq)₂tpip and Ir(dfpiq)₂tpip with the quantum efficiencies of 15% and 17%, respectively. The HOMO/LUMO levels are calculated as-4.80/-2.58 and-4.73/-2.57 eV, respectively. Under electric field from 1150 to 1300 (V·cm^-1)_1/2, the electron mobilities in 60 nm Ir(tfmpiq)₂tpip and Ir(dfpiq)₂tpip layers are 6.61~8.49×10^-6 cm²·V^-1·s^-1 and 6.08~6.61×10^-6 cm²·V^-1·s^-1, respectively. The devices with the structure of ITO/TAPC(60 nm)/Ir-complex (15wt%): CBP (50 nm)/TPBi(60 nm)/LiF(1 nm)/Al(100 nm) were fabricated. The device based on Ir(dfpiq)₂tpip exhibited a luminance of 18195 cd·m^-2 at a driving voltage of 12.0 Vwith a maximum current efficiency (η_c) of 4.71 cd·A^-1 and a maximum power efficiency (η_p) of 1.82 lm·W^-1, respectively. While the device based on Ir(tfmpiq)₂tpip exhibited a luminance of 14676 cd·m^-2 at a driving voltage of 12.0 V with a maximum η_c of 3.47 cd·A^-1 and η_p of 1.51 lm·W^-1, respectively.
- red iridium complex;2-(2,4-difluorophenyl)quinoline;2-(4-(trifluoromethyl)phenyl) quinoline;tetraphenylimidodiphos- phinate;electron mobility;organic light-emitting diodes,
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沈阳化工大学材料科学与工程学院沈阳 110142