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Title: | C1-Symmetric [Ir(C^N1)(C^N2)(N^O)]-Tris-Heteroleptic Ir(III)-Complexes with a horizontal orientation for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs) | Authors: | Li, W Miao, T Wang, B Liu, J Lü, X Fu, G Feng, W Wong, WY |
Issue Date: | 14-Jul-2021 | Source: | Journal of materials chemistry C, 14 July 2021, v. 9, no. 26, p. 8337-8344 | Abstract: | Using conventionalfac-[Ir(C^N)3]-homoleptic or [Ir(C^N)2(L^X)]-bis-heteroleptic iridium(iii)-complexes with NIR-phosphorescence (NIR = near infrared) as dopants, the realization of reliable NIR-OLEDs/PLEDs (organic/polymer light-emitting diodes) with high performance remains a real challenge. In this study, taking Hqibt (1-(benzo[b]-thiophen-2-yl)-isoquinoline) as the HC^N1ligand, Hppy (phenyl-4-yl)pyridine) as the HC^N2ligand and Br-Hpic (5-Br-picolinic acid) or Hpic (picolinic acid) as the N^O-ancillary, two novelC1-symmetric [Ir(C^N1)(C^N2)(N^O)]-tris-heteroleptic iridium(iii)-complexes [Ir(iqbt)(ppy)(pic)] (1) and [Ir(iqbt)(ppy)(Br-pic)] (2) are molecularly designed, respectively, where large TDM (transition dipole moment) and strengthened3MLCT (metal-to-ligand charge transfer) effects are established to afford their good NIR-phosphorescent efficiency (ΦPL= 0.27 for1(λem= 698 nm); 0.21 for2(λem= 696 nm)). Moreover, in their doped EMLs (emitting layers), a preferentially horizontal orientation of the TDMs is promoted, due to which, theNIR-PLEDs-1-2exhibit an attractively high efficiency (ηmaxEQE= 3.1-4.7%;λem= 698 nm) as well as an almost negligible (<5%) efficiency roll-off. This finding means theC1-symmetric [Ir(C^N1)(C^N2)(N^O)]-tris-heteroleptic Ir(iii)-complexes show potential as low-cost, large-area and scalable NIR-PLEDs. | Publisher: | Royal Society of Chemistry | Journal: | Journal of materials chemistry C | ISSN: | 2050-7526 | EISSN: | 2050-7534 | DOI: | 10.1039/d1tc01977e | Rights: | This journal is © The Royal Society of Chemistry 2021 The following publication Li, W., Miao, T., Wang, B., Liu, J., Lü, X., Fu, G., ... & Wong, W. Y. (2021). C 1-Symmetric [Ir (C^ N 1)(C^ N 2)(N^ O)]-tris-heteroleptic Ir (iii)-complexes with a horizontal orientation for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs). Journal of Materials Chemistry C, 9(26), 8337-8344 is available at https://doi.org/10.1039/d1tc01977e. |
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