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Yellowish-orange phosphorescent iridium(III) complexes of bis-cyclometalated ligand with pyrazolone derivatives: synthesis, characterization, photophysical and thermal properties

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Abstract

Three novel heteroleptic iridium complexes containing 2-phenylbenzothiazole (bt) as the cyclometalated ligands and variety of pyrazolone-based Schiff-based derivatives as ancillary ligands were synthesized and characterized by spectroscopic techniques such as 1H-NMR, 13C-NMR, mass, FT-IR and elemental analysis. The electronic and photonic properties of these complexes were tuned by introducing electron donating groups on the 4-position of phenyl ring attached to nitrogen. All the complexes show good photoluminescence properties in solid state as well as in solution state having λPL in the range of 540–562 nm with CIE coordinates (0.40, 0.59). Electrochemical and photophysical properties were performed to evaluate suitability of designed compounds for organic light-emitting diodes (OLEDs). The designed complexes show bandgap (Eg) and quantum yield (ΦPL) in the range of 2.38 to 2.40 eV and 0.48 to 0.57, respectively. The emission lifetime of complexes I, II and III were measured in solution and solid state and were found to be 0.243 μs, 0.391 μs and 0.280 μs and 0.190 μs, 0.557 μs, 0.414 μs, respectively. All the synthesized complexes display high thermal stability up to 300 °C.

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Acknowledgements

The authors express sincere thanks to Science and Engineering Research Board (SERB), New Delhi SB/EMEQ-204/2014, Gujarat Council of Science and Technology (GUJCOST), Gandhinagar (Ref. No. GUJCOST/MRP/14–15/27), Department of Science and Technology (DST), New Delhi, India under the Technology System Group (TSG) program (Ref. No. DST/TSG/PT/2011/194‐G) and Scheme of Young Scientist & Technologist (SYST) (Ref. No. SP/YO/008/2017(G)) for financial support. PS thanks IIT Kanpur for funding and infrastructure. The authors KRS, MJP and JDS are thankful to the Head, Department of Chemistry, Sardar Patel University, Centre for Advance study (CAS) (No. F.540/3/CAS/2011(SAP-I) for providing basic infrastructural and instrumental facility. MJP and JDS acknowledge financial support as INSPIRE fellowship (DST/INSPIRE Fellowship/2015/IF 150296) and (SYST, Ref. No. SP/YO/008/2017(G)), respectively, from DST, New Delhi.

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Authors and Affiliations

  1. Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Anand, Gujarat, 388120, India

    Meha J. Prajapati, Jaydip D. Solanki, Hiren K. Machhi, Saurabh S. Soni & Kiran R. Surati

  2. Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India

    Pratik Sen

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  1. Meha J. Prajapati
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Correspondence to Kiran R. Surati.

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Prajapati, M.J., Solanki, J.D., Machhi, H.K. et al. Yellowish-orange phosphorescent iridium(III) complexes of bis-cyclometalated ligand with pyrazolone derivatives: synthesis, characterization, photophysical and thermal properties. J Mater Sci: Mater Electron 31, 13778–13786 (2020). https://doi.org/10.1007/s10854-020-03937-z

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