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Realization of room temperature electro-phosphorescence from an iridium metal based efficient novel triplet emitter

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Abstract

Herein, we report a novel triplet emitter based on a cyclometalated ligand, 2-phenylimidazo[1,2-a] pyridine (Pip) and an ancillary bidentate ligand 2,2,6,6-tetramethyl-3,5-heptanedione (tmd) for its application in second generation phosphorescent organic light-emitting diodes (PHOLEDs). The structural conformation of the molecule has been acquired through nuclear magnetic resonance (NMR) spectroscopy. The proposed molecule has been subjected to optical, electrochemical, thermal and electroluminescent measurements. The photoluminescence measurements suggest that the molecule emits in the green region of electromagnetic spectra having its peak at 510 nm. The thermal properties of the molecule exhibit good stability up to 300 ℃. The efficient energy transfer between our guest molecule and hosts PVK and CBP witnessed the potential of this molecule as an efficient guest for PHOLEDs. The electroluminescent measurements reveal that the device fabricated with this molecule exhibits green electroluminescence similar to the photoluminescence with a low turn-on voltage of 3 V.

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Acknowledgements

Authors are grateful to Department of Science and Technology, Government of India for financial support through the Science and Engineering Research Board (SERB) project EMR/ 2016/002316 and Institute of Eminence, University of Delhi (Faculty Research Program Grant – IOE – Ref. No./IOE/2021/12/FRP). One of the authors (Ankit Kumar Rao) is grateful to CSIR for the NET-JRF fellowship.

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  1. Department of Physics and Astrophysics, University of Delhi, New Delhi, 110058, India

    Ankit Kumar Rao, Devanshu Varshney & Amarjeet Kaur

  2. CSIR-National Physical Laboratory, Dr. K S Krishnan Road, New Delhi, 110012, India

    Ritu Srivastava

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  1. Ankit Kumar Rao
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Rao, A.K., Varshney, D., Srivastava, R. et al. Realization of room temperature electro-phosphorescence from an iridium metal based efficient novel triplet emitter. Appl. Phys. A 128, 766 (2022). https://doi.org/10.1007/s00339-022-05891-5

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