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Efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs) based on heteroleptic Iridium(III) complexes with post-modification effect of intramolecular hydrogen bond or BF2-chelation

Abstract

As to heteroleptic iridium(III)-complex capable of near-infrared (NIR) emitting, the elaboration of ancillary ligand is unexplored enough. In this study, through the OH-modification at the 3-position of picolinato (pic) ancillary ligand, we report two new complexes [Ir(iqbt)2(hpa)] (1; Hqibt = 1-(benzo[b]-thiophen-2-yl)-isoquinoline; hpa = 3-hydroxypicolinate) with intramolecular hydrogen bond and [Ir(iqbt)2(BF2-hpa)] (2) by further BF2-chelation, exhibiting the desirable NIR luminescent properties (em = 700 nm with a shoulder at 760 nm, lifetime  = 2.13 s and quantum yield PL = 0.13 for 1 versus em = 692 nm with a shoulder at 756 nm, lifetime  = 0.76 s and quantum yield PL = 0.08 for 2) in the respective solution at RT. Moreover, two series of solution-processed NIR polymer light-emitting diodes (PLEDs-I-II) are fabricated from these two complexes in the presence of TmPyPB-assisted (TyPMPB = 1,3,5-tri[(3-pyridyl)-phen-3-yl]benzene) carrier balance or not, respectively, where superior performance (EQEmax = 2.22% and almost negligible efficiency-roll-off) is obtained for complex-1-doping NIR-PLED-II especially with the facilitated electron-transport.

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Publication details

The article was received on 12 Jul 2018, accepted on 03 Sep 2018 and first published on 04 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC03432J
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs) based on heteroleptic Iridium(III) complexes with post-modification effect of intramolecular hydrogen bond or BF2-chelation

    G. Fu, H. Zheng, Y. Hui, W. Li, X. Lv and H. He, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC03432J

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