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   https://doi.org/10.1039/d2qi02058k  

   Yoon, Sungwon ; Teets, Thomas S. ( December 2022 , Inorganic Chemistry Frontiers)

   The design of deep-red to near-infrared (DR-NIR) phosphorescent compounds with high photoluminescence quantum yields ( Φ PL ) is a significant fundamental challenge that impacts applications including optoelectronic devices, imaging, and sensing. Here we show that bis-cyclometalated iridium complexes with electron-rich ancillary ligands can have exceptional quantum yields for DR-NIR phosphorescence (peak λ > 700 nm). Six bis-cyclometalated iridium( iii ) complexes with DR-NIR phosphorescence are described in this work, pairing highly conjugated cyclometalating ligands with electron-rich and sterically encumbered β-ketoiminate (acNac), β-diketiminate (NacNac), and N , N ′-diisopropylbenzamidinate (dipba) ancillary ligands. The photoluminescence spectra and quantum yields are solvent-dependent, consistent with significant charge-transfer character in the emissive excited state. The ancillary ligands perturb the excited-state kinetics relative to closely related compounds, which can lead to enhanced Φ PL values in the DR-NIR region, particularly in toluene solution and in doped polymer films. 

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2. Cyano-Isocyanide Iridium(III) Complexes with Pure Blue Phosphorescence

   https://doi.org/10.1021/acs.inorgchem.1c00103  

   Cañada, Louise M. ; Kölling, Johanna ; Wen, Zhili ; Wu, Judy I-Chia ; Teets, Thomas S. ( May 2021 , Inorganic Chemistry)
3. Near-IR Phosphorescence of Iridium(III) Corroles at Ambient Temperature

   https://doi.org/10.1021/ja101647t  

   Palmer, Joshua H. ; Durrell, Alec C. ; Gross, Zeev ; Winkler, Jay R. ; Gray, Harry B. ( July 2010 , Journal of the American Chemical Society)
4. Efficient near-infrared luminescence from bis-cyclometalated iridium( iii ) complexes with rigid quinoline-derived ancillary ligands

   https://doi.org/10.1039/D0CC02745F  

   Lai, Po-Ni ; Yoon, Sungwon ; Teets, Thomas S. ( August 2020 , Chemical Communications)

   Five new near-infrared (NIR) phosphorescent bis-cyclometalated iridium( iii ) complexes, partnering highly conjugated cyclometalating ligands with quinoline-derived ancillary ligands, have been developed. These complexes have peak NIR luminescence wavelengths from 711 to 729 nm, with photoluminescence quantum yields ranging from 0.042 to 0.36. 

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5. Modular Imine Chelates with Variable Anionic Donors Promote Red Phosphorescence in Cyclometalated Iridium Complexes

   https://doi.org/10.1021/acs.inorgchem.3c01770  

   Jiang, Chenggang ; Yoon, Sungwon ; Nguyen, Yennie H. ; Teets, Thomas S. ( July 2023 , Inorganic Chemistry)