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TPE-diphenylamine derivatives as solution-processable hole injectors with better charge balance for organic light-emitting diodes

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Abstract

Charge injection and transport layers with optimum carrier transport properties are essential for stable and efficient organic light-emitting diode (OLED) devices. Herein, we report two tetraphenylethylene-diphenylamine derivatives, TPOMe and TPOSt having four and two methoxy substituents, respectively, and explore their potential as solution-processable hole injection layers (HILs) for OLEDs. Standard, Alq3-based green OLEDs with a simple device design were used to demonstrate the properties of the synthesized HILs, in comparison with a commercially available standard HIL, m-MTDATA. TPOMe-based device exhibited a current efficiency of 4.2 cd A−1, while TPOSt-based device showed 3.81 cd A−1 at 10 mA cm−2. Both the above devices showed better performance compared to a control device fabricated with the standard HIL, m-MTDATA, which showed a relatively lower current efficiency value (1.70 cd A−1 at 10 mA cm−2). Similarly, the maximum external quantum efficiency (EQE) of TPOMe (1.77%) and TPOSt (1.55%) were higher than that of the m-MTDATA-based device (1.40%). Although m-MTDATA device has better luminance and hole mobility compared to TPOMe and TPOSt devices, the optimum charge balance in the latter devices leads to better current efficiency and EQE.

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Acknowledgements

The financial support from the Council of Scientific and Industrial Research (MLP 0049 & DST-Nanomission-GAP 162939) is gratefully acknowledged. SB and VD gratefully acknowledge CSIR, Government of India, for their research Fellowship.

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Authors and Affiliations

  1. Photosciences and Photonics Section, Chemical Sciences and Technology Division (CSTD), CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, 695019, India

    Shibna Balakrishnan, Pavithra V Prabhu & Joshy Joseph

  2. Centre for Sustainable Energy Technologies (C-SET), CSIR - National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, 695019, India

    C K Vipin, Vibhu Darshan & K N Narayanan Unni

  3. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India

    Shibna Balakrishnan, Pavithra V Prabhu, C K Vipin, Vibhu Darshan, K N Narayanan Unni & Joshy Joseph

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  1. Shibna Balakrishnan
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  2. Pavithra V Prabhu
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  3. C K Vipin
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  4. Vibhu Darshan
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  5. K N Narayanan Unni
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  6. Joshy Joseph
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Correspondence to Joshy Joseph.

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Balakrishnan, S., Prabhu, P.V., Vipin, C.K. et al. TPE-diphenylamine derivatives as solution-processable hole injectors with better charge balance for organic light-emitting diodes. Bull Mater Sci 47, 58 (2024). https://doi.org/10.1007/s12034-023-03119-7

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  • DOI: https://doi.org/10.1007/s12034-023-03119-7

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