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| Synthesis and Electroluminescence of Two Red Iridium Complexes |
| Author Name | Affiliation | E-mail | | ZHANG Song | State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China | | | XUE Li-Sha | State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China | | | WU Chen | State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China | | | ZHENG You-Xuan* | State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China | yxzheng@nju.edu.cn | | ZUO Jing-Lin* | State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China | zuojl@nju.edu.cn |
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| Abstract: 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 (ηc) of 4.71 cd·A-1 and a maximum power efficiency (ηp) 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 ηc of 3.47 cd·A-1 and ηp of 1.51 lm·W-1, respectively. |
| Keywords: 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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| 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. |
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